Guide to Circuit ID Formats

The format of each type of circuit ID used in CEMR is explained in the table below. Jump to the Carrier Facility Format and Message Trunk Format farther down the page.

Prefix: 1-2 alphanumeric characters. This is an optional field.
Service Code & Modifier: 2-4 alphabetic characters (usually 4). This is a required field.
Serial Number: 1-6 digits. This is a required field.
Suffix: 3 character suffix to the serial number may be required (rarely used).

CO (Company) Code: 2-4 alphabetic characters (usually NW, MS, or PN). This is a required field.
Segment: 1-3 alphanumeric characters. optional for non-multi-point circuits. multi-point segments map to Circuit End Location, e.g. CLK1 = A, CLK2 = B

A Billing Telephone Number (BTN) cannot be used for opening a Trouble Report. The Serial Number Circuit Format must be used.

Prefix: alphanumeric characters. required if it exists (not all telephone number circuits have a prefix)
Service Code & Modifier: 2-4 alphabetic characters (usually 4); This is a required field when specifying a non-DSL telephone numbered circuit.
NPA: 3 digits. This is a required field.
NXX: 3 digits. This is a required field.
Line: 4 digits. This is a required field.
Extension: 1-5 alphanumeric characters. This is an optional field.

For states: AZ, CO, ID, MT, NM, UT, WY, alphas not accepted; convert D1 to 0001, D2 to 0002, etc.

Segment: 1-3 alphanumeric characters. This is an optional field. rarely used

Channel Group Number: 1-5 alphanumeric characters. This is a required field.
Facility Type: 1-6 alphanumeric characters. This is a required field. Examples: T1, T1F, T1U, T1UZF, T1Z, T1ZF, T3
A CLLI Code: 8 or 11 alphanumeric characters. This is a required field.
Z CLLI Code: 8 or 11 alphanumeric characters. This is a required field.

All 4 of the above components are required

Trunk Number: 1-4 alphanumeric characters. This is a required field.
Traffic Class: 1-2 alphanumeric characters. This is a required field. A hyphen may be allowed
Office Class: 1-2 alphanumeric characters. This is a required field. A hyphen may be allowed

A separator is not used between the Traffic Class and Office Class

Traffic Use Code: 2 alphanumeric characters. This is a required field. A hyphen may be allowed. No separator between Office class and Traffic Use Code
Traffic Modifier: 1-7 alphanumeric characters. This is an optional field. No separator between Traffic Use Code and Traffic Modifier
A CLLI Code: 8 or 11 alphanumeric characters. This is a required field.
Pulse & Direction: 2 alphanumeric characters. This is a required field.
Z CLLI Code: 8 or 11 alphanumeric characters. This is a required field.