Nortel DMS-100 Circuit Digit Table (CKTDIGIT)

Table Name

Circuit Digit Table

Functional Description of Table CKTDIGIT

Table CKTDIGIT allows the end-office to map a particular 0ZZ (Domestic - 0ZZ-XXX number format), 1NX (International - 1NX-XXX-CCC number format) code (in field CKTDIGS) into a Transit Network Selector (TNS) (in field CKT_CODE) when originating an Equal Access (EA) call to an Access Tandem (AT) over Signaling System #7 (SS7) trunking.  This table is also used to allow the AT to map the received TNS into a particular 0ZZ or 1NX code.  The AT extracts field CARRIER_NAMES from table OCCINFO (Equal Access Other Common Carrier Information) using the XXX digits received in the TNS.

Calls arriving at an AT on SS7 trunks are identified as EA calls by the presence of the TNS parameter.  The TNS parameter contains the equivalent of the Multifrequency (MF) EA 0ZZ-XXX or 1N/NZ-XXX digits.

In the AT switch, the combination of the resultant 0ZZ or 1NX with the XXX digits (and CCC or 01R for international carrier calls) from the TNS is provided to pretranslations.  The pretranslation either results in an Interexchange Carrier (IEC) route selection or the activation of a Service Switching Point (SSP) function such as an Enhanced 800 Service (E800) database query.

Datafill Sequence & Size

The following tables must be datafilled before table CKTDIGIT:

An entry can be deleted from table CKTDIGIT at any time without special requirements.  If the carrier is deleted from table OCCINFO without deleting it from table CKTDIGITS first, the entry in table CKTDIGIT is automatically deleted.  Table size is 0 to 1,780 tuples.

Datafill

The following table describes datafill for table CKTDIGIT:

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Table CKTDIGIT Field Descriptions

Field       Subfield       Entry                     Explanation and Action
----------------------------------------------------------------------------------------------
KEY                        See Subfields             Key
                                                     This field consists of subfields 
						     CARRIER_NAMES and CKT_CODE.

            CARRIER_NAMES  Alphanumeric              Carrier Names
	                   (1 to 16 characters)      Enter the name of the carrier for equal 
			                             access calls.  See table OCCNAME.


            CKT_CODE       1, 2, 8 to 15             Circuit Code
	                                             At the end-office, enter the circuit code
						     to be included in the TNS optional 
						     parameter in an Initial Address Message 
						     (IAM).

                                                     At the AT, enter the circuit code expected
						     in the TNS optional parameter in an IAM 
						     received at the switching unit for an EA 
						     call from an EA end-office.
---------------------------------------------------------------------------------------------
CKTDIGS                    000 to 999                Circuit Digits
                                                     Enter the first three digits in the EA 
						     signaling digit sequences 0ZZ-XXX, 
						     1N/NX-XXX-CCC, or 1N/NX-XXX-01R transmitted 
						     on MF trunks.  In the AT, these digits are
						     used to single out one of the outgoing
						     circuits in the carrier group identified by
						     the XXX digits.
                                                     
                                                     Note: The first digit must be 0 or 1. 
						     The remaining two digits can be any value
						     from 00 to 99.
----------------------------------------------------------------------------------------------
-End-

Datafill Example

The following example MAP display shows sample datafill for table CKTDIGIT.


KEY     CKTDIGS
_______________
GTE 1       179
GTE 11      099 
ITT 1       179 
ITT 11      099  
SSP 8       088