CLLI Codes Explained

by Crossbar

Common Language was developed for use by all Bell Client Companies (BCC).

This Common Language is used in prepared Work Order Record and Details (WORD) documents.  Common Language is presently being used to prepare records of circuits, trunks, and equipment for the Trunks Integrated Records Keeping System (TIRKS).

In this documentation I will be explaining the construction of Common Language Location Identification (CLLI) Codes.

The CLLI Codes are used to identify particular telephone buildings within a given geographic area.  They specify a particular work force or administrative group within the building.  The CLLI Codes are also used to identify the non-building locations.  These codes are made up of 11 alphanumerics that identify the telephone building.  They are made up as follows:

  • X = Alpha, N = Numeric
  • Place  (XXXX)  Character Position: 1-4
  • State  (XX)  Character Position: 5-6
  • Building  (XX or NN)  Character Position: 7-8
  • Entity  (XXX)  Character Position: 9-11
  • Switching or Non-Switching
  • Non-Building Location  (XNNNN)  Character Position: 7-11
  • Customer Location  (NXNNN)  Character Position: 7-11

Place Code

The Place Code is considered to be a municipal locality such as a town, city, or community.

Military locations, local names, or major shopping centers might also be referred to as a Place Code.  The Place Code is a 4-character alpha-mnemonic.  An example of one would be DNVR for Denver, Colorado.

State Code

The State Code is a two character code representing a particular state.

Provision is made for entering a Province of Canada Code or a Country Code if applicable.  An example of one of these would be CO for Colorado.

Building Code

The Building Code identifies the particular building within the geographic area.

The building may be represented by a 2-character alpha code, or 2-digit numeric code.  An example would be XG or 56.  That example means nothing to me.  If it is a building, like a Central Office in Ohio or such, then it is by chance, I swear.  If the first letter in the code happens to be an X, such as XL, then it means that the building is an Independent Telco Location.

Entity Code

An Entity Code specifies any unit or equipment, work group, person, or job function which is directly related to message and/or data switching and termination.

Entities are assigned to two broad categories, switching and non switching.  They are made up of alpha and/or numeric characters.  An example of this would be FG4.

When it isn't necessary to specify a particular group within a building, the Entity Code may be dropped and a CLLI consisting of a Non-Building Location will indicate a site or position of telephone equipment other than a building.

The Non-Building Code is a 5-character mnemonic code.  These are the abbreviations for position seven:

  • B = International Boundary Crossing Point
  • E = End Point
  • J = Junctions
  • M = Manholes
  • P = Poles
  • Q = Radio Locations
  • S = Toll Stations
  • X = Independent Company Non-Building Location
  • N = Customer Locations
  • U = Miscellaneous Non-Building Locations

STLTEO is Satellite-Earth Orbit.  This replaces position 1 through 6.  The Radio Code completes the code.

Customer Location

A Customer Location may be a military installation, a customer located switched service network, a customer located Centrex installation, or a location required for trunk forecasting and design work.

I hope this will help you in your quest for knowledge.  Remember, all knowledge is useful.
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