atcomsystems.ca/forum Forums General General Telephone & Systems Information circuit ID's

Most CPE techs are familiar with T1 circuit IDs that look something like the following:

"95/HCGS/241396/NE".

That type of T1 circuit runs between an end user and a service provider.

Circuits that run between switches, (LEC->LEC, LEC->CLEC, LEC->IXC...etc), have IDs that look something along the lines of the following:

8001/T1/BSTNMACODC1/CMBRMAWADC0 or
8002/T1ZF/BSTNMACODC1/CMBRMAWADC0

The ID breaks down like this:

Circuit Carrier Number/Line Coding Type/"A" end Cilli/"Z" end Cilli.

T1 = AMI
T1ZF = B8ZS.

As a CO tech, I work with all of these kinds of circuits.

thanks for clearing that up

Here are a few more types of circuit IDs people may or may not be familiar with:

1) 95/XHGS/123456/NE

2) 95/LGGS/123456/NE

The first ID represents a stand-alone digital DS0 say 56k or 64k.

The second represents a stand-alone analog DS0 type of circuit. Used to see a lot of these, but they are pretty rare now.

XH=56 Kb DDS
XD=64 Kb DDS
Both for ID’s are for access circuits... Meaning there’s an IXC (LD carrier) involved.
Non-Access (within one LATA) has an entirely different set of service codes.

One more format most ya’ll will see that wasn't mentioned in this thread: The good ol’ telephone number format.

Prefix/service code+modifier/NPA/NXX/line number/extension or trunk/segment

Prefix= Admin Area or Market Area designator
Service Code= Two characters representing the type of service
Modifier= provides additional info for the service code including % Lata usage and billing
NPA= Area code
NXX= C.O. code or exchange ID
Line Number= well, that’s the number of the line
Extension= Got me… Never seen that used before
Trunk Code= The sequential number of the trunk in the trunk group
Segment= Drop identifier for multi-point circuits

Example for an OPX circuit:
01/OPNA/111/555/8750//002

01=Market Area
OP= Off-premise extension
NA= inter-lata with no other parameter needed
111= Area Code
555=Exchange
8750=Phone number
“//” No extension or trunk code present
002= Drop two of a multi point OPX


There’s also a message trunk ID that is used to move calls, signaling information between switches:

Trunk number / traffic class (2 characters) – Office class (2 characters) Traffic use (2 characters) Trunk Type modifier /A-end CILLI / signaling code / Z-end CILLI

0001/PH55TEKEWUA/OFLNMOXAAMD/77/OFLNMOXADS0

First trunk (0001) that for two-way SS7 trunks (I’m not even going to try to ‘splain it any more than that… They usually confuse the crap out of me too.)