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:
---------------------------------------------------------------------------------------------- Trunk Group Type Type Title ---------------------------------------------------------------------------------------------- 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 ---------------------------------------------------------------------------------------------- -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.
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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)
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X75 X75
Trunk group type X75 allows the connection of DMS trunking facilities to a DMS
packet handler (which uses X.75 protocol).
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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.
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-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) $
|
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.