Nortel DMS-100 Trunk Group Table (TRKGRP)

Table Name

Trunk Group Table

Functional Description of Table TRKGRP

Table TRKGRP contains operating company-defined data associated with each trunk group that exists in the switching unit.  Entries in this table consist of the following information:

The titles of the documentation section associated with each of the trunk group types available in table TRKGRP are listed in the table below:

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Trunk Group Type

Type        Title
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A5          Two-Way or Outgoing from Local to N.E.
AI          Automatic Intercept System
AN          Automatic Number Announcement
ANI         Automatic Number Identification
ATC         Access Tandem to Carrier
CA          Come-Again Signaling
CELL        Cellular
CISANI      Commonwealth of Independent States Automatic Number Identification
DA          Directory Assistance Charging
DS0         Digital Signal Level 0
E911        Enhanced 911 Emergency Service
ES          Outgoing to Emergency Service Bureau
GER2W       Two-way 1TR7 ISUP
GERIC       Incoming 1TR7 ISUP 
GEROG       Outgoing 1TR7 ISUP 
GTRK        Global Trunks 
GW          Gateway Trunks 
IBNTI       IBN Incoming 
IBNT2       IBN Two-Way 
IBNTO       IBN Outgoing 
IET         Interexchange 
INT101      International 101 Test 
IR          Outgoing No Outpulsing 
IS          Tandem Switching No Digits Incoming 
IT          Intertoll 
ITL2        International 102 Test 
ITOPS       International TOPS
LOOPA       Line Loop Test Unit 
LP4W        Four-wire Digital Loop Test Line 
LPBK        Loopback 
MAINT       Maintenance 
MTR         International 
NFA         Network Facility Access 
NU          Nailed-Up Connection 
OC          OG/2W from Local to CAMA 
OI          Operator Incoming
OP          OG/2W from Local or Toll to TOPS or TSPS 
OPR         International Operator (No Metering) 
OS          Outgoing from Toll 
P2          Two-Way PBX DID/DOD 
PRA         ISDN Primary Rate Access 
PRIVLN      Private Line 
PX          Two-way Digital PBX
RC          Recording Completing 
RONI        TOPS Remote Operator Number Identification 
ROTL        Remote Office Test Line
SC          2W/IC from North AMR5 or CAMA 
SOCKT       Short or Open Circuit Test Line (SCKT or SCKT)
SPC         Semi-Permanent Connections 
T101        101 Communication Test Line 
T105        Terminating 105 Test Line 
T2          Two-Way End Office 
TD          Incoming and Outgoing Test Desk 
TDDO        Tandem Two-Stage Direct-Dial Overseas 
TI          Incoming End Office 
TL          CCIS Transmission Link 
TO          Outgoing End Office 
TOPS        TOPS Trunk Groups 
TOPSARU     TOPS External Audio Response Unit 
TOPSVL      TOPS Voice Link 
TPS101      International 101 Test Line 
TTL2        Terminating 102 Test Line
UT          Utility Telemetry 
VR          Operator Verification 
X75         X75 
ZI          0+ or 0- Tandem to TSPS or TOPS
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-End-

Description of Trunk Group Types

The set of trunk group types available for use in a specific office is a function of the hardware and software features and feature packages installed in that office.  Some trunk group types that are available in an office have fields that are subject to the presence of a feature.

The structure of the DMS software in an end office can be legacy, Generic Services Framework (GSF), or both.  Legacy and GSF structures can be used at the same time on the same DMS switch.

Before attempting to datafill table TRKGRP (or any other data schema table) a trunking diagram or equivalent, reflecting the hardware and software features and feature packages ordered for the office, must be at hand.

The trunk group type descriptions listed in the following table are useful as a general guide only and should not be used as a definitive statement of the trunk group types available for use in any specific office.







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Trunk Group Type Descriptions

Type       Description
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AI         Automatic Intercept System
           In a DMS office, outgoing trunk group type AI interfaces with an Automatic Intercept
  	   System (AIS).  An information digit that is sent to the AIS selects the recorded 
	   announcement that is returned to the originator of the call.
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AN         Automatic Number Announcement
           In a DMS end office, outgoing trunk group type AN interfaces with an Automatic Number 
	   Announcement (ANA) system.  ANI spill consisting of the actual calling number is sent
	   to ANA, which returns a recorded voice announcement of the calling number.
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ANI        International Automatic Number Identification 
           In an international DMS office, two-way, incoming, or outgoing trunk group type
	   ANI interfaces with another international office for applications that require
	   Automatic Number Identification (ANI) information.

           In a DMS International Centralized Automatic Message Accounting (ICAMA) toll
	   office, two-way, or incoming trunk group type ANI interfaces with an international
	   office for calls requiring ICAMA services.

           Trunk group type ANI handles ANI signaling.  A sample trunking configuration for
           his trunk group type is shown in Figure 3.
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ANIINTL    ANI International 
           This option has three subfields RECEIVE, CAINMSG, and CPNLBLK to support different 
	   functionality for processing the CPN for calls originating on SS7 FGD trunks.  When 
	   the ANIINTL.RECEIVE option in set to "Y", the CPN will not undergo ANI screening or 
	   be processed as an ANI for billing purposes and the CPN will not be populated in the 
	   ANISP (ANI Spill) field of the CDR273 record.  This also ensures that the call will 
	   not go to ADBF (ANI Database Failure) treatment.
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ATC        Access Tandem to Carrier
           In a DMS access tandem or a DMS equal-access end office, two-way trunk group 
	   type ATC interfaces with an interexchange carrier to carry equal-access traffic.
           A sample trunking configuration for trunk group type ATC is shown in Figure 7.
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A5         Toll From North Electric AMR5
           In a DMS end office, outgoing trunk group type A5 interfaces with an AMR5 toll
	   office to handle Automatic Message Accounting (AMA) and operator assisted calls that
	   use AMR5 signaling.

           Two-way trunk group type A5, in addition to the outgoing trunk functions, can be set
	   up for the following incoming trunk functions:

             * Dedicated to toll completing
	     * Dedicated to verification
	     * Combined toll completing and verification
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CA         Siemens ADDS Come-Again Signaling
           In a DMS end office, outgoing trunk group type CA interfaces with a Siemens ADDS
	   switch for one-plus (1+), zero-plus (0+) and zero-minus (0-) calls, each identified
	   by a distinct ID digit that is prefixed to the called number.  Coin and non-coin
	   calls are routed using separate trunk groups.
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CELL       Cellular
           Outgoing, incoming, or two-way trunk group type CELL allows a Bellcore type 2A 
	   interconnection between an Access Tandem (AT) DMS-200 switch and a Cellular Mobile 
	   Carrier (CMC) switch.  A sample trunking configuration for trunk group type CELL is 
           shown in Figure 8.
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CISANI     Commonwealth of Independent States Automatic Number Identification
           Trunk group type CISANI is used to distinguish toll ANI trunks from local and local
	   tandem trunks in the Commonwealth of Independent States (CIS) telephony network. 
	   This trunk group is used by the international DMS for ICAMA calls.
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CPNLBLK    Calling Party Numbers Line Block
           The CPNLBLK option for ISUP IMT trunks will be supported in table TRKGRP.  When the 
	   CPNLBLK is present for the SS7 IMT terminator, the CPN is not included OPTIONAL PART
	   of the outgoing IAM message.
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DA         Directory Assistance Charging
           In a DMS end office, outgoing trunk group type DA interfaces with a directory 
	   assistance charging system.  ANI spill can be outpulsed provided the call type is 
	   Operator Assisted (OA).
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DS0        Digital Signal Level 0
           In a DMS Service Switching Point (SSP) office, trunk group type DS0 has the 
	   capability of Common Channel Signaling 7 (CCS7) link access to a Signal Transfer
	   Point (STP) node.  The DS0 link is a single channel 64 kbit/s link.
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ES         Emergency Service Bureau
           In a DMS end office, outgoing trunk group type ES interfaces with an Emergency 
	   Service Bureau (ESB) system.
 
           Depending on the ESB setup, the trunk group can have ANI spill of the calling number 
	   in addition to outpulsing of the called number (for example, 911).  Alternately, the 
	   trunk group can be set up to have no ANI spill (independent of whether the called 
	   number is outpulsed).
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E911       Enhanced 911 Emergency Service
           In a DMS E911 tandem (DMS-100 or 100/200 with the Enhanced 911 Emergency Service 
	   feature), incoming trunk group type E911, together with tables E911PSAP and E911ESN, 
	   provides selective routing to the applicable Public Safety Answering Point (PSAP) 
	   using the Emergency Service Number (ESN) corresponding to the Emergency Service Zone 
	   (EZN) of the originator of the 911 call.
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FWDXMT     Forward Transmit
           Enter FWDXMT to control the voice path setup of trunk agencies.  The DXMT option can
	   be datafiled with one of three values: STD, IMM, ANS for SS7 FGD, SS7 IMT.  For PTS 
	   FGD, the FWDXMT option can be datafiled with one of two values: STD and ANS.  For
	   4-wire DAL-TIE, the FWDXMT option can be added without the option values.
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GERIC      Incoming 1TR7 ISUP
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GEROG      Outgoing 1TR7 ISUP
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GER2W      Two-Way 1TR7 ISUP
           Trunk group type GERIC, GEROG, and GER2W are required for the German Intelligent
	   Network field trial in order to handle the requirements of 1TR7 ISUP signaling when
	   the direction of the trunk group is incoming, outgoing, or two-way, respectively.
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GTRK       Global Trunk
           In an DMS Global-100 end office, trunk group type GTRK provides a single trunk 
	   type for two-way call processing.
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GW         International Gateway
           In a DMS international gateway office, two-way, incoming, or outgoing trunk
	   group type GW is used as follows:

	     * Gateway R1 and R1-5 Hybrid Signaling interfaces with the North American
	       switching network.
             * Gateway CCITT 5 Signaling interfaces with the international switching network.
             * Gateway CCITT 6 Signaling interfaces with the international switching network.
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IBNT2      Two-Way Integrated Business Network
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IBNTI      Incoming Integrated Business Network
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IBNTO      Outgoing Integrated Business Network
           In a DMS Integrated Business Network (IBN) end office, two-way trunk group type 
	   IBNT2, incoming trunk group type IBNTI, and outgoing trunk group type IBNTO
	   interface with an IBN end office as tie trunk groups and FX trunk groups that
	   provide one or two-way access between IBN customer groups on different switching
	   units, or access to the same customer group when the customer group is assigned
	   to two or more switching units.
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IET        Interexchange
           IET is a general purpose tandem trunk type used in the setup of trunks that operate 
	   with Send-Receive Multifrequency (SRMF) signaling.
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IMTFGD     IFD Trunk Agencies
           Enter IMTFGD to identify IFD trunk agencies.  This option can be datafilled on SS7 
	   FGD trunk agencies.
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INT101     International 101 Test
           In a DMS gateway office, incoming or outgoing trunk group type INT101 is used for 
	   the international 101 test.
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IR         Intercept, Information, or Repair with No Outpulsing
           In a DMS-100 end office, outgoing trunk group type IR interfaces with an intercept, 
	   information, or repair desk.  No digits are outpulsed.
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IS         Tandem Switching No Digits Incoming
           In a DMS toll or end office, incoming trunk group type IS can route a call (upon 
	   seizure) through table OFRT to an outgoing trunk group at the route index specified 
	   for the trunk group.  Table OFRT permits digit prefixing where appropriate.  Calls 
	   from a number of incoming trunk groups can be datafilled to go out on a common trunk
	   group.
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ISUPIDX    ISUPIDX enumerated range is expanded to include RSVD.
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IT         Toll Connecting
           In a DMS toll or end office, two-way, incoming, or outgoing trunk group type IT 
	   interfaces with a toll or end office to carry toll connecting traffic including toll 
	   access, toll completing, and toll tandem.  Overlap outpulsing is possible on incoming
	   or two-way Dial Pulse (DP) trunk groups provided field OVLP in table TRKSGRP is set 
	   to "Y" (yes).  In offices without the ROTL software package (without trunk group type
	   T105), the 105 test line can be datafilled as trunk group type IT.  A sample trunking
           configuration for trunk group type IT is shown in Figure 7.
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ITL2       International 102 Test
           In a DMS office, trunk group type ITL2 is used for the international 102 test.
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ITOPS      International Traffic Operator Position System
           In a DMS international office, outgoing trunk group type ITOPS interfaces with an 
	   International Traffic Operator Position System (ITOPS) office for calls requiring
	   the services of an ITOPS operator.  In a DMS international TOPS office, incoming
	   trunk group type ITOPS interfaces with a DMS international office for calls
	   requiring the services of an ITOPS operator.  In both cases, the signaling format
	   meets the following international TOPS requirements:

	     * Operator control of disconnect, which is used on outgoing trunks from the local
	       end office to a toll office with ITOPS positions, allows ITOPS operators to have
	       control of the calling and the called parties involved in a call.  When the
	       calling party disconnects (on-hook signal sent from end office to toll office),
	       the end office does not initiate disconnect until it receives an on-hook signal
	       from the toll office.  This on-hook signal is under ITOPS operator control.

	     * The Ring Forward (RFG) wink signal is used by an ITOPS operator at the
	       originating toll office to recall the ITOPS operator at the terminating toll
	       office for a previously established connection.

	     * The Ring Back (RGB) wink signal is used by an ITOPS operator at the terminating
	       toll office to recall the ITOPS operator at the originating toll office for a 
	       previously established connection.  This signal is also used by an ITOPS
	       operator to ring a calling party that has been disconnected.

           To meet ITOPS requirements, the line signaling system can support either delay-dial
	   start or wink start.  Trunk group type ITOPS software handles ANI.  A sample trunking
           configuration for trunk group type ITOPS is shown in Figures 4, 5, and 6.
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LOOPA      Loop-Around Test
           In a DMS office, trunk group type LOOPA is used for the loop-around test.
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LPBK       Loopback Trunk 
           In a DMS ISDN office, incoming and outgoing trunk group type LPBK provides a means 
	   of connecting two agents in the same office when a call between the two agents is not 
	   possible using other loopback facilities.  The call between the two agents is split 
	   into two legs:

	     * The first leg of the call selects an outgoing LPBK trunk to terminate the
	       original call.  The outgoing trunk loops back to the same office to come in
	       as an incoming trunk of trunk group type LPBK.

             * The second leg of the call connects the incoming LPBK trunk to the terminating
	       agent.
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LP4W       Four-Wire Digital Loop Test
           The four-wire digital loop test line trunk group is used for performing terminating 
           and originating loop-around tests on CCITT 7 ISUP trunks in a DMS-300 switching unit.
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MAINT      Maintenance Tests
           In a DMS office, trunk group type MAINT is used for the following maintenance 
     	   support items and tests:

             * Dialable Cable Locator Tone
	     * Digital Test Unit
	     * Emergency Stand-Alone
             * Position Head Set
             * Position Jack
	     * Line Test Unit and LTU Talk & Monitor
             * Metallic Test Unit
             * 108 Test line
             * Trunk Test Transmission
             * Terminating Transmission Test
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MTR        International with Metering
           In a DMS international office, two-way, incoming, or outgoing trunk group type MTR 
	   interfaces with other international offices for local or national traffic.  Metering 
	   is available as an option; calls that do not require metering can also use MTR trunks.
        
	   Metering (MTR) type trunk groups handle the majority of call types.  A normal call 
	   requiring no operator and no ICAMA applications goes through the network on MTR
           trunks. Sample trunking configurations for trunk group type MTR are shown in
           Figures 1, 3, 4, 5, and 6.
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NFA        Network Facility Access
           Trunk group type NFA is used for the assignment of Network Facility Access (NFA)
	   trunks that connect a subscriber line to an Intelligent Peripheral Processor (IP).
	   These connections provide subscribers with direct access to services provided
	   directly by the IP.
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NODELAY    No Delay
           The NODELAY option only supports incoming and two-way PX trunks with IPULSTYP of DT 
	   and ISTARTSG of WK.  When the NODELAY option is present on an incoming or two-way 
	   PX trunk, the four second post dial delay will not be present for 1+10 digit calls
	   using the AMBI TIM selector.  When the NODELAY option is not present on an incoming
	   or two-way PX trunk, the four second post dial delay will be present for 1+10 digit
	   calls using the AMBI TIM selector.
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NU         Nailed-Up Connection
           In a toll, end, or international gateway office, a trunk of incoming trunk group
	   type NU can be permanently connected (nailed-up) to a trunk of outgoing trunk group
	   type NU.  Table NLUPCLLI lists each nailed up connection that consists of an incoming
	   trunk group type NU trunk and an outgoing trunk group type NU trunk.
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OC         Local ANI to Toll CAMA
           In a DMS end office, outgoing trunk group type OC interfaces with a toll office to 
	   carry non-coin subscriber dialed chargeable calls (TOPS operator assistance not 
	   required) recorded by CAMA in the toll office (calls are not recorded by LAMA in end 
	   office).  Signaling formats include the CAMA ANI pulsing format, which is used for
	   CAMA offices that do not use Traffic Service Position Systems (TSPS).  If the far-end
	   toll office is a DMS switch, the far-end of trunk group type OC enters the far-end
	   DMS toll office as trunk group type SC.

           In a DMS end office, two-way trunk group type OC interfaces with a toll office to 
 	   carry, in addition to the outgoing trunk traffic, the following incoming trunk 
	   traffic:

	     * Dedicated to toll completing
	     * Dedicated to verification
	     * Combined toll completing and verification

	   In a DMS Equal Access End Office (EAEO) or an access tandem office, two-way trunk 
	   group type OC interfaces with Feature Group B (FGB) Equal Access (EA) carriers.

           In a DMS toll or TOPS office, outgoing trunk group type OC can tandem a call to 
	   another toll office as a CAMA call, outpulsing ANI when required.

           A sample trunking configuration for trunk group type OC is shown in Figure 7.
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OI         Incoming Operator Verification
           In a DMS office, incoming trunk group type OI interfaces with an operator
	   switchboard or a TOPS office to carry one of the following traffic options:

	     * Dedicated to toll completing
	     * Dedicated to verification
	     * Combined toll completing and verification

           Refer to trunk group type VR for additional information on verification calls.
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OP         Local TSPS Pulsing to TOPS
           In a DMS end office, outgoing trunk group type OP interfaces with a TOPS or 
	   TSPS office and can be set up to carry any or all of the following types of 
	   traffic:
	     
	     * Non-coin subscriber dialed chargeable calls recorded by CAMA in the TOPS 
	       office using ANI or ONI (provided they are not recorded by LAMA in the 
	       end office).
	     
               Note: This function is similar to the function of trunk group type OC. 
	             TOPS operator assistance is not required.

             * Coin and non-coin, TOPS operator assisted calls that can be recorded by 
	       CAMA in the TOPS office using ANI or ONI.

           Signaling formats include the pulsing format for TSPS from local office. 
	   If the far-end switch is a DMS TOPS office, the far-end of trunk group type 
	   OP enters the DMS TOPS office as trunk group type TOPS.

           In a DMS end office, two-way trunk group type OP can be set up for the 
	   following incoming trunk functions (in addition to the outgoing trunk 
	   functions):

	     * Dedicated to toll completing
	     * Dedicated to verification
	     * Combined toll completing and verification

           A sample trunking configuration for trunk group type OP is shown in Figure 7.
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OPR        International with Operator
           In a DMS international office, two-way, incoming, or outgoing trunk group type 
	   OPR interfaces with other international offices for local or national traffic 
	   involving an operator.  Metering is not available.

	   Operator (OPR) trunks are used to connect BA-1 switchboard operators to the DMS, 
	   and to connect two DMS switches for calls from one BA-1 switchboard operator to 
	   another office (possibly to another BA-1 switchboard operator).  A sample trunking 
           configuration for trunk group type OPR is shown in Figure 2.
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OS         Toll Completing Joint Hold
           In a DMS toll office equipped with feature package NTX193AA (4X Operation-AMR 5 
	   Format ANI), outgoing trunk group type OS is used for toll completing and toll 
	   tandem calls requiring the joint hold feature.
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PRA        Primary Rate Access
           Trunk group type PRA is used by the ISDN Primary Rate Access feature.
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PRIVLN     Gateway Private Line
           Incoming or outgoing trunk group type PRIVLN is used for private lines in a DMS 
	   gateway office.
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PX         DID/DOD PBX Digital
           In a DMS end office, two-way, incoming, or outgoing trunk group type PX interfaces 
	   with a digital Private Branch Exchange (PBX) for Direct Inward Dialing (DID), 
	   Direct Outward Dialing (DOD), or both.
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P2         DID/DOD PBX
           In a DMS end office, two-way, incoming, or outgoing trunk group type P2 connects 
	   with a PBX for DID, DOD, or both.
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RC         Recording Completing
           In a DMS office, trunk group type RC interfaces to a 3CL switchboard with an 
	   audible class of service tone forwarded to the operator.
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RESETBLK   Reset Dial Block 
           When this new option is assigned, reset dialing will not be allowed for calls on 
	   that trunk.
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RONI       Remote ONI
           In a TOPS office, trunk group type RONI is part of a feature that records ONI calls 
	   (using LAMA or CAMA) in an office with no CAMA positions in operation.  ANI fail and 
	   ONI calls are routed to a TOPS office where they come in on a trunk group of type 
	   RONI.  The remote TOPS operator communicates by voice with the originator of the call 
	   and keys in the calling number, which is sent back to the original office where the 
	   call is recorded by LAMA or CAMA.
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ROTL       Remote Office Test Line
           Trunk group type ROTL is used in a DMS office that is equipped with feature BR0069. 
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SC         Incoming/Two-Way CAMA
           In a DMS toll office, and under certain conditions in a DMS TOPS office, incoming 
	   trunk group type SC interfaces with an end office to carry non-coin subscriber dialed 
	   chargeable calls (TOPS operator assistance not required) recorded by CAMA in the toll 
	   office (the calls are not recorded by LAMA in the far-end office).  Signaling formats 
	   include the CAMA ANI pulsing format (non-TSPS CAMA office).  ANI calls are recorded 
	   by CAMA automatically.  In-band coin control is possible.

           ANI fail and ONI calls are handled by the CAMA operator who enters the calling
	   number manually to enable the recording of the call by CAMA.  The call is then sent
	   on for toll completion.

	   If the 4X feature is present, operator assisted traffic (0+ and 0-) can tandem 
	   through the switch to a switching unit with TOPS or TSPS using outgoing trunk 
	   group type OP.  If the far-end is a DMS switch, the far-end of trunk group type 
	   SC leaves the far-end DMS switch as trunk group type OC.

           In a DMS toll office, two-way trunk group type SC can be set up for the following 
	   outgoing trunk functions (in addition to the incoming trunk functions):

             * Dedicated to toll completing
	     * Dedicated to verification
	     * Combined toll completing and verification

           A sample trunking configuration for trunk group type SC is shown in Figure 7. 
	   Refer to trunk group type VR for additional information on verification calls.
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SOCKT      Transmission Test
           In a DMS office, trunk group type SOCKT is used for transmission tests.
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SPC        Semi-Permanent Connection
           In an international office, a trunk of an outgoing trunk group type SPC can be 
	   connected semipermanently to:

	     * A trunk of an outgoing trunk group type SPC
	     * A line of line class code SPC

	   Table SPCCON has a tuple for each semipermanent connection to identify the two 
	   members of the connection.
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TD         Test Desk
           In a DMS end office, incoming and outgoing trunk group type TD interfaces with a 
	   test desk (for example, #14 LTD or #3 LTC).
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TDDO       Two-Stage Direct Dial Overseas
           In a DMS toll office, outgoing trunk group type TDDO interfaces with an
	   international originating toll center for tandem switching of two-stage calls.
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TI, TO, T2 Incoming End Office, Outgoing End Office, Two-Way End Office
           In a DMS office, incoming, outgoing, or two-way trunk group type TI, TO, or T2 
	   interfaces with an end or toll office for local, direct, or tandem switching.
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TL         CCIS Transmission Link
           In a DMS office capable of Common Channel Interoffice Signaling (CCIS), two-way 
	   trunk group type TL interfaces with another office capable of CCIS to transmit 
	   and receive signals between the two offices.  Call processing functions are not 
	   supported.
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TOPS       Traffic Operator Position System
           In a DMS TOPS office, incoming trunk group type TOPS interfaces with an end office 
	   and can be set up to carry any or all of the following types of traffic:

             * Non-coin subscriber dialed chargeable calls recorded by CAMA in the TOPS
	       office using ANI or ONI.

               Note: This function is similar to the function of trunk group type SC. 
	             TOPS operator assistance is not required.

             * Coin and non-coin TOPS operator assisted calls that can be recorded by CAMA 
	       in the TOPS office using ANI or ONI.

           Signaling formats include the pulsing format for Traffic Service Position System
	   (TSPS) from local office.  If the far-end is a DMS switch, the far-end of trunk 
	   group type TOPS leaves the far-end DMS office as trunk group type OP.

           In a DMS toll office, two-way trunk group type TOPS can be set up for the following 
	   outgoing trunk functions (in addition to the incoming trunk functions):

	     * Dedicated to toll completing
	     * Dedicated to verification
	     * Combined toll completing and verification

           A sample trunking configuration for trunk group type TOPS is shown in Figure 7.
	   Refer to trunk group type VR for additional information on verification calls.
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TOPSAU     TOPS External Audio Response Unit
           In a DMS TOPS office, outgoing trunk group type TOPSARU interfaces with a 
	   Directory Assistance System (DAS) external Audio Response Unit (ARU) to provide 
	   an announcement in response to an operator request.  No outpulsing is done.
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TOPSVL     TOPS Voice Link
           In a DMS TOPS office, outgoing trunk group type TOPSVL interfaces with a Voice 
	   Service Node (VSN), enabling the use of the Automated Alternate Billing Service 
	   (AABS).  No outpulsing is done.
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TPS101     International 101 Test Line
           In a DMS international office, trunk group type TPS101 is used as the international 
	   101 test line.
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TTL2       Carrier Milliwatt Test
           In a DMS office, trunk group type TTL2 is used for the carrier milliwatt supply and 
	   balance termination test.
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T101       101 Test Line
           In a DMS office, incoming and outgoing trunk group type T101 is used for the type 
	   101 test.
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T105       105 Test Line
           In a DMS office, trunk group type T105 is used for the terminating 105 test line 
	   provided the ROTL software package is present in the office.  In offices without 
	   the ROTL package (without trunk group type T105), the terminating 105 test line 
	   can be datafilled as a trunk group of type IT.
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UT         Utility Telemetry
           In a DMS office, incoming trunk group type UT connects to a Central Office Service 
	   Unit (COSU).  The COSU initiates and controls telemetry calls to Telemetry Interface
	   Units (TIU) on subscriber lines.  The DMS office translates the digits received from 
	   the COSU and attempts to establish a no-ring connection to a subscriber's line. 
	   The UT trunk returns the appropriate treatment to the COSU if the line is not idle.

	   If the line is idle, the COSU is cut through to the TIU and the telemetry session 
	   proceeds.  When the telemetry session is completed or the subscriber goes off-hook, 
	   the COSU instructs the DMS office to take down the call.
----------------------------------------------------------------------------------------------
VR         Verification
           In a DMS end office, outgoing trunk group type VR interfaces with a minibar switch
	   to provide metallic path access to a call in progress between two other parties.

	   The need for metallic path access arises when an authorized operator originated 
	   verification call attempts to terminate on a line that is busy.

	   A call is a verification call when it originates on a trunk group type A5, OC, OP, 
	   OI, or TD and one of the following three groups of conditions is satisfied:

	     * The type of call is Operator Assisted (OA)
	     * The trunk group is dedicated to verification (MODE VF)
	     * The trunk group is dedicated to both toll completing and verification (MODE CV)
----------------------------------------------------------------------------------------------
X75        X75
           Trunk group type X75 allows the connection of DMS trunking facilities to a DMS 
	   packet handler (which uses X.75 protocol).
----------------------------------------------------------------------------------------------
ZI         Tandem 0+ and 0- to TOPS
           In a DMS toll office, incoming trunk group type ZI can tandem zero-plus (0+) and 
	   zero-minus (0-) traffic to TOPS over outgoing trunk group type OP.  If the far-end 
	   switch is a DMS switch, the far-end of trunk group type ZI leaves the far-end DMS 
	   office as trunk group type OP.
----------------------------------------------------------------------------------------------
-End-

Sample Trunking Configurations

Sample trunking configurations for a number of typical applications are shown below.  The arrows in each figure denote the direction of call progression, and in the case of trunks, indicate the connection from an outgoing trunk on one switch to an incoming trunk on the subsequent switch.

Figure 1: Inter-Office Local Call (DMS International)

Figure 2: Subscriber to BA-1 Board Operator Call (DMS International)
Figure 3: Subscriber-Originated Call Through ICAMA (DMS International)

Figure 4: Subscriber-Originated Call Through ITOPS (DMS International)

Figure 5: Subscriber-Originated Call Through ITOPS Operators (DMS International)

Figure 6: ITOPS Operator-Originated Call (DMS International)
Figure 7: Access Tandem Environment (DMS AT & EAEO)

Figure 8: Cellular Mobile Carrier (CMC Interconnection)

Datafill Sequence and Implications

Table CLLI must be datafilled prior to table TRKGRP.

The following tables may also require datafilling prior to table TRKGRP, depending on the group type.

Table Size

Field SIZE in table DATASIZE specifies the total number of trunk groups that can be datafilled in table TRKGRP.  The table length can be extended by changing the value of this field and performing a cold restart.  The maximum number of trunk groups that can be datafilled is 8,191.  Each tuple in table TRKGRP requires 49 words of data store.

Note: If the NORESTARTSWACT utility is available on your switch, you can activate data changes without interrupting service.  Refer to NORESTARTSWACT User's Guide, NTP 297-1001-546.

ASEQ/DSEQ selection sequences should be limited to the following trunk group size:

Exceeding this recommended limit may significantly increase call completion time.

General Field Information

General field information that is common to most field types is included in this section of the document.  For detailed information specific to a particular trunk group type, refer to the TRKGRP documentation section that deals with that trunk group type.

GRPINFO and Related Fields

While the default structure of table TRKGRP is set up as two fields, GRPKEY (which contains the key to the table) and GRPINFO (which contains all of the other fields), this structure may be modified if table CUSTFLDS is datafilled with an entry for table TRKGRP.  The modified structure generally consists of fields GRPKEY, GRPTYP, TRAFSNO, PADGRP, NCCLS, and GRPINFO.

In the modified structure, fields GRPTYP, TRAFNSO, PADGRP, and NCCLS become separate fields rather than subfields of GRPINFO, however the datafill sequence for entry values remains unchanged.  The documentation for table TRKGRP is based on the two field (default) structure, since this the most common.

Traffic Class (Field TRAFCLS)

This field is provided for the convenience of operating companies that associate their own traffic class code with each trunk group.  The following table shows some sample traffic class codes.  DMS software does not use most of the data in field TRAFCLS.

Note: Class code BLV, for busy-line verification, is an exception.  To enable Local Number Portability (LNP) for an incoming trunk from a TOPS scrambler circuit, set the traffic class field for that trunk to BLV.  Trunks with traffic class set to BLV must be dedicated to BLV calls.

       
----------------------------------------------------------------------------------------------
Examples of Traffic Class Codes

Traffic Class        Usage
----------------------------------------------------------------------------------------------
AL                   Alarm
AN                   Announcement 
BLV                  Busy Line Verify 
CA                   CAMA 
CB                   Coin Box 
CD                   Customer Dial Instruction 
CP                   CAMA Office to CAMA Operator Desk 
CS                   Coin Supervision 
DA                   Directory Assistance 
DD                   DDD Access 
DS                   Dial Tone Speed
IA                   Intraoffice 
IE                   Interoffice 
IN                   Information 
IR                   Intercept
IT                   Intertoll
LW                   Leave Word 
MA                   Manual Assistance 
MB                   Mobile Radio
MI                   Miscellaneous 
MN                   Manual 
MT                   Intertandem 
NT                   No Test 
OA                   Operator Assistance 
OF                   Official
OW                   Order Wire 
PS                   Permanent Signal
RC                   Recording Completing 
RR                   Rate and Route
RS                   Repair Service 
SC                   Service Code 
SO                   Service Observing 
SP                   TSPS or TOPS
TA                   Toll Station 
TC                   Toll Completing
TE                   End Office Toll 
TG                   Tandem Completing 
TI                   Time 
TK                   Test Disk 
TM                   Toll Completing and Toll Switching Combined 
TO                   Tandem Originating 
TP                   TOPS or TSPS Unit to TOPS or TSPS Position 
TS                   Toll Switching 
TT                   Toll Tandem
TW                   TWX Switching Plan 
VC                   Vacant Code 
VR                   Verification
WE                   Weather
----------------------------------------------------------------------------------------------
-End-

Traffic Separation Numbers (Field TRANSNO)

If the switching unit has feature package NTX085AA (Traffic Separation Peg Count), the range of values for the incoming and outgoing traffic separation numbers are dependent upon the value of office parameters TFAN_IN_MAX_NUMBER and TFAN_OUT_MAX_NUMBER in table OFCENG.

For switching units without feature package NTX085AA, the range of values for the traffic separation numbers is 0 to 15.

Incoming and outgoing traffic separation numbers 1 to 9 are reserved for generic traffic separation numbers.  See table TFANINT for the assignment of incoming to outgoing traffic separation numbers.

With the traffic separation feature, a peg count of all calls, by type of call, Direct Dial (DD), Operator Assisted (OA), or No Prefix (NP), can be accumulated between an originating source (incoming trunk or an originating line attribute) and a terminating destination (outgoing trunk, terminating line attribute, tone, or announcement).

Pad Groups (Field PADGRP)

Field PADGRP contains the name of the pad group in table PADDATA that lists the value of the pad circuits that can be switched into the network when one of the members of the group is involved in a call.

Different values for the pad circuits can be specified when the circuit connects to an agent with a different pad group.

Network pad switching is only applicable when a new circuit is connected to the public switching network.

Operational Measurement No-Circuit Classes (Field NCCLS)

Table TRKGRP field NCCLS specifies the Operational Measurement (OM) register that is incremented when treatment GNCT occurs.  Refer to the Operational Measurements Reference Manual for information on DMS OMs.

Treatment GNCT occurs when a trunk group is the last route in a route list and an "All Trunks Busy" condition is encountered on this list.

OM react to treatment GNCT by incrementing register OFZ2 to record the number of times the GNCT treatment is invoked and by incrementing one of the registers listed below to indicate which type of facility was unavailable, as defined by the entry in table TRKGRP field NCCLS.

If a trunk group is incoming, no-circuit class is not required.  Enter NCRT to satisfy the table editor.

For outgoing or the outgoing side of a two-way trunk group, the operating company can assign any of the no-circuit classes listed in the following table.

----------------------------------------------------------------------------------------------
No-Circuit Classes

Field NCCLS Entry        Register Name          Register Description
----------------------------------------------------------------------------------------------
NCBN                     OFZNCBN                No-circuit business network (IBN trunks)
NCID                     OFZNCID                No-circuit inward dial (2W DID/DOD trunks)
NCIM                     OFZNCIM                No-circuit intermachine
NCIT                     OFZNCIT                No-circuit intertoll
NCLT                     OFZNCLT                No-circuit local tandem
NCOF                     OFZNCOF                No-circuit offnet trunk (ONAL, ONAT, DOL, 
                                                or DOT)
NCON                     OFZNCON                No-circuit onnet trunk (DAL, MTX)
NCOT                     OFZNCOT                No-circuit other trunk (test lines, test desk, 
                                                or maintenance trunks)
NCRT                     OFZNCRT                No-circuit (0+/0- tandem to TOPS, outgoing to 
                                                AMR5 or CAMA, outgoing local, recording 
						completing outgoing, TOPS outgoing)
NCTC                     OFZNCTC                No-circuit toll completing
NCSC                     OFZNOSC                No-service circuit (AN or AI trunks)
----------------------------------------------------------------------------------------------
-End-

Trunk Selection Problems

Two main problems currently exist with Central Office (CO) trunk selection:

Problem 1: Killer Trunks  A killer trunk is one that has any of the characteristics listed below:

Problem 2: Glare  Glare occurs if two COs try to seize the same trunk at the same time.

Trunk Selection Algorithms

The trunk selection algorithms for two-way trunk groups in a DMS office are datafilled in field SELSEQ.  The following selection algorithms are available:

Note: CNTLODD and CNTLEVN are used for JPN ISUP only.

A summary of the problems and relative merits of the various trunk selection schemes follows.

Select Sequence - MIDL/LIDL

The MIDL/LIDL process is based on the length of time a trunk member is idle.  One central office selects from a trunk group the trunk that is idle for the longest period of time.  The opposite end central office selects from a trunk group the trunk that is idle for the shortest period of time.  The selection order of trunks is not fixed.

MIDL/LIDL and Killer Trunks

In a LIDL office, some types of killer trunks move to the head of the list.  When one does, it becomes the least idle trunk and is repeatedly seized.  All calls routed to this killer trunk fail to complete.



MIDL/LIDL and Glare

MIDL/LIDL minimizes glare by preventing the possibility of simultaneous seizure prior to the seizure of the last idle trunk in the trunk group.

Select Sequence - CNTLODD/CNTLEVN

The CNTLODD/CNTLEVN selection sequence method logically divides trunk groups into a controlling group and a non-controlling group on the basis of odd or even Circuit Identification Codes (CIC).  When an outgoing trunk is required, the controlling group circuit that has been released the longest (most idle) is selected.  If all circuits in the controlling group are busy, the latest released circuit (least idle) in the non-controlling group is selected instead.

If a select sequence (field SELSEQ value) of CNTLODD is assigned, the controlling group is the set of odd numbered CICs.  If a select sequence of CNTLEVN is assigned, the controlling group is the set of even numbered CICs.

CNTLODD/CNTLEVN and Glare

CNTLODD/CNTLEVN trunk selection minimizes the occurrence of glare.

Select Sequence - ASEQ/DSEQ

Sequential trunk selection minimizes the occurrence of glare and reduces reseizure of killer trunks encountered with the MIDL/LIDL trunk selection method when used for two-way trunks.  In sequential trunk selection, the trunk selection order and selection starting point are fixed.  The beginning of the list for one CO is the end of the list for the opposite end CO.  This list is searched sequentially by each CO, starting from the beginning of the list, for the first idle trunk.  One CO selects the first idle trunk, searching the list in ascending order.  The opposite end CO selects the first idle trunk, searching the list in descending order.

Caution: It is recommended that ASEQ/DSEQ selection sequences should be limited to a maximum of 175 trunk members in DMS offices with NT40 processors.  Exceeding this recommended limit may significantly increase call completion time.

ASEQ/DSEQ and Killer Trunks

The position of a killer trunk in the sequential list determines its impact on trunk selection.  A killer trunk in the middle of the list has minimal impact but one near either end has significant impact.  This is due to all searches starting at one end or the other of the trunk member list.  If the traffic is such that an idle trunk is found near the end of the list for most searches, then a killer trunk will be seized more often than a killer trunk in the middle of the list.

ASEQ/DSEQ and Glare

ASEQ/DSEQ minimizes glare by preventing simultaneous seizure prior to the seizure of the last idle trunk in the trunk group.

Select Sequence - CWCTH/CCWCTH

Like ASEQ/DSEQ, the circular trunk selection strategy is based on a fixed ordered list of trunks.  The two COs search the list in opposite directions, similar to the ASEQ/DSEQ method.  The trunk selected is the first idle trunk found in a search starting after the Most Recently Released (MRR) trunk in the trunk group.

For an analogy, use a clock to denote the list of trunks with the hours representing the trunks.  In a two-way trunk group, one CO searches the list of trunks clockwise from a common reference point.  The other CO searches the list of trunks counterclockwise from the same reference point as the first CO.  The common reference point is the MRR trunk in the group.  The reference point is updated each time a trunk is released.

Circular Trunk Group Selection

CWCTH/CCWCTH and Killer Trunks

Circular Trunk Hunting (CTH) substantially reduces the impact of killer trunks.  Repeatedly seized killer trunks are not reseized as often under the CTH selection method as with the MIDL/LIDL and ASEQ/DSEQ selection methods, in two-way trunk groups.  In the CTH selection method, the selection starting point changes each time a trunk is released (the MRR trunk).  If the MRR trunk is a killer trunk, the next trunk seized is a trunk to either side of the killer trunk.  CTH has no effect on the other types of killer trunks.





CWCTH/CCWCTH, Killer Trunks, and Operational Measurements

The killer trunk feature gathers usage and peg counts for each trunk, over a specified interval of time, to detect killer trunks.  The count is updated upon seizure of a trunk, when the trunk changes from a "Not Call Processing Busy" state to a "Call Processing Busy" state.  CTH reduces the number of times a killer trunk is seized.  Therefore, CTH lowers the threshold used in determining whether a trunk has killer trunk characteristics.

CWCTH/CCWCTH and Glare

Glare occurs when one or two idle trunks are left in the trunk group.  CTH does not affect the occurrence of glare.  Glare occurrence during CTH is the same as glare occurrence during the two other trunk selection methods.

Choosing a Trunk Selection Method and Sequence

Field SELSEQ defines the trunk selection method and sequence for the two-way trunk group.  The trunk selection method for a two-way trunk group in a DMS office must be compatible with the switching office equipment at the far-end of the trunk group.  This requirement is outlined below.

If the trunk group is two-way and the far-end is a link list switcher, enter one of the following select sequences.  The link list switcher is a method of call processing that determines trunk selection based on a dynamically linked list of trunk members.

LIDL  Enter LIDL (Least Idle) if far-end is a link list switcher with MIDL (Most Idle) select sequence.

MIDL  Enter MIDL (Most Idle) if far-end is a link list switcher with LIDL (Least Idle) select sequence.

Far-End Not Link List Switcher

If sequential selection (feature package NTX244AB, Enhanced Sequential Trunk Hunting) is present, the trunk group is two-way, the far-end is not a link list switcher, and sequential selection is required, enter one of the following selection sequences:

ASEQ  Enter ASEQ for Ascending Sequential selection based on the order of trunk members in table TRKMEM, if the far-end is descending sequential selection.

DSEQ  Enter DSEQ for Descending Sequential selection based on the order of trunk members in table TRKMEM, if the far-end is ascending sequential selection.

CWCTH  Enter CWCTH for Clockwise Circular Trunk Hunting from the MRR trunk in the trunk group, based on the order of trunk members in table TRKMEM, if the far-end is counterclockwise circular trunk hunting.

CCWCTH  Enter CCWCTH for Counterclockwise Circular Trunk Hunting from the MRR trunk in the trunk group, based on the order of trunk members in table TRKMEM, if the far-end is clockwise circular trunk hunting.




Far-End Not Link List

If the trunk group is two-way, the far-end is not a link list switcher, and sequential selection does not apply, enter MIDL (to satisfy the table editor).

Changing Trunk Selection Method and Sequence

A trunk group trunk selection method cannot be changed.  If such a change is required, create a new trunk group that has the required trunk selection method, then delete the individual trunks from the old trunk group and add them to the new trunk group.

For an existing trunk group, the selection sequence can be changed to ASEQ from DSEQ or from DSEQ to ASEQ if all the members are Installation Busy (INB) or unequipped.

Software Structure

Trunk groups belonging to legacy and Generic Services Framework (GSF) software structures can be datafilled in table TRKGRP.  Each structure uses different tables as shown below:

----------------------------------------------------------------------------------------------
Mapping of Legacy Tables to GSF Tables

Legacy Table        GSF Table
---------------------------------------------------------------------------------------------
TRKGRP              TRKGRP
ISUPDEST            TRKSERV
TRKSGRP             TRKSIGPF
TRKMEM              TRKBCHNL
C7TRKMEM            TRKBCHNL
FAILMSG             FAILMAP
TMTMAP              TRKTRMT
----------------------------------------------------------------------------------------------

Legacy Software Structure

This section contains information about datafilling tables for the legacy software structure.

Table TRKGRP - Additional Information in Other Tables

Additional information about table TRKGRP is defined in other tables as shown in the following table:

----------------------------------------------------------------------------------------------
Recommended Entry in Table CUSTPROT

TABNAME    READPROT    UPDTPROT    ALLPROT
----------------------------------------------------------------------------------------------
TRKGRP     15          20          30
----------------------------------------------------------------------------------------------

Define Table Size in Table DATASIZE

The total number of trunk groups for which memory is allocated in table TRKGRP is equal to the value of field SIZE in table DATASIZE.  The length of the table can be extended by changing the value of SIZE in table DATASIZE and doing a cold restart.  The maximum number of trunk groups is 8,191.

Define Trunk Subgroups in Table TRKSGRP

Each of the trunk groups in table TRKGRP is assigned a maximum of two subgroups.  Subgroups are provided so that the trunk group can have a mixture of analog and digital trunks or a mixture of analog card types (maximum two).

Define Trunk Group Members in Table TRKMEM

The trunk number in a group, and the physical location of all analog or digital trunks assigned to the trunk groups, are listed in table TRKMEM.

Define Trunk Group Billing Code in Table BILLCODE

The billing code data for each of the incoming or two-way CAMA or AMR5 trunk groups is listed in table BILLCODE.

Generic Services Framework Structure

This section contains information about datafilling tables for the GSF software structure.

Define Trunk Subgroups in Table TRKSIGPF

Each of the trunk groups in table TRKGRP is assigned a maximum of two subgroups.  Subgroups are provided so that the trunk group can have a mixture of analog and digital trunks or a mixture of analog card types (maximum two).

Define Trunk Group Members in Table TRKBCHNL

The trunk number in a group, and the physical location of all analog or digital trunks assigned to the trunk groups, are listed in table TRKBCHNL.

Define CCS7 Trunk Members in Table TRKBCHNL

The CCS7 Circuit Identification Code (CIC) for each CCS7 trunk member is listed in table TRKBCHNL.

Miscellaneous Notes

Trunking Diagram

Before datafilling various trunk group type forms, an office trunking diagram or equivalent must be available.

Synchronous Clock Table SYNCLK

For central office synchronization, two DS-1 channels must be assigned as synchronization timing links.  Refer to the description of table SYNCLK for further details.

Restoration of Original Datafill After Testing

Once installation tests are completed, the original trunk translations are restored to original datafill.

Equal Access for DMS-100 Wireless

When datafilling Equal Access (EA) on the DMS-100 Wireless switch, the wireless portion of an ISUP Integrated Service Link (ISL) trunk must be datafilled as a DID trunk group type with refinement RTEVIAAT set to "Y".  The wireline portion of the ISUP ISL trunk must be datafilled as an IT trunk type.  Option CELL must be set to "2A" to support North American EA ISL terminations.  A distinct billable number must be designated for option BILLNO for the downstream processor to distinguish the AMA records generated by the wireless DID ISL and non-ISL trunks.

Memory Allocation

Tuples are allocated in blocks of 32, with each tuple consuming 100 bytes:
32 * 100 = 3,200 bytes

Each time a new group is added, an additional 64 bytes is allocated.

The following is an example calculation for 32 tuples:
(32 * 100) + (32 * 64) = 5,248 bytes

Datafill Examples

The following is an example MAP display of an EANT trunk type using the ANIINTL option with subfields RECEIVE, CAINMSG, and CPNLBLK:


GRPKEY         GRPTYP     
                          TRAFSNO            PADGRP            
                          NCCLS              GRPINFO
___________________________________________________________________________
250TEANT2WS7   EANT 0 NPDGP NCOF UCS 0 2W 250PRETT LIDL 16 7 16 16 ANIPRETT
               4 4 619 UCS2EAEO NIL 619 7 NONE 0 NONE 0 0 3_1KHZ 160
                          (ANIDIGS)          (TMANIDLV ALWAYS)  
			  (CICSIZE 4DIGS)    (ANIINTL N N Y) $


The following is an example of a IMT trunk using the CPNLBLK option:


GRPKEY           GRPTYP     
                          TRAFSNO            PADGRP 
                          NCCLS              GRPINFO
____________________________________________________________________________
250_OG_RLT_RTPC  IMT 0 NPDGP NCIT UCS 0 OG NPRT MIDL 16 16 16 16 UCS2UCS NIL
                 C N NONE 4 ALWAYS ADDR 1 1 INTER N SPEECH NONE 4 160 619 0 
		          (RLT V1 N)         (TMCICBLK BLK_TNS) 
			  (CICSIZE 4DIGS)    (CPNLBLK ) $











The following is an example of a PX trunk using the NODELAY option:

GRPKEY     GRPINFO
______________________________________________________________________________________
RCC20PX    PX 0 ELO NCRT IC NIL MIDL N POT1 NSCR 619 619 LCL NONE NONE NLCA N N 32 NIL
           5400002 DIALTN N N N (NODELAY) $

RCC0PX     PX 0 ELO NCRT 2W NIL MIDL N POT1 NSCR 619 619 LCL NONE NONE NLCA N N 32 NIL
           5400002 DIALTN N N N (NODELAY) $


The following example shows TRKGRP tuple with the RESETBLK option:


GRPKEY         GRPTYP        
                             TRAFSNO       PADGRP 
                             NCCLS         GRPINFO
_____________________________________________________________________________________
DAL228TWDTLS   DAL 127 NPDGP NCON 0 2W DAL MIDL 16 7 16 16 S 10 NIL DL 0 5 111 MANUAL
               214 0 6112211 NONE 0 VOICE_DATA Y 1 N Y NONE 00 160 
	                     (MCCS )       (OHQTERM ) 
			     (CAIN )       (RESETBLK) $


Datafill Warnings

If an attempt is made to datafill the option on an outgoing PX trunk, the following error message is displayed:

NODELAY option allowed on IC or 2W trunks only.