Clli code

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CLLI code (COMMON LANGUAGE Location Identifier code) is an identifier used within the North American telecommunications industry to specify the location and type of a piece of telecommunications equipment. CLLI codes were developed by and are issued by Telcordia. Originally, they were used by Bell Telephone companies, but since all other telecommunications carriers needed to interconnect with the dominant Bell companies, CLLI code adoption eventually became universal.

CLLI codes are useful to telephone companies for ordering phone service, for rating of call detail records (and hence billing), and to assist in tracing calls. CLLI codes are associated with Vertical and Horizontal coordinates (frequently abbreviated to "V and H coordinates"), which were developed by AT&T researcher Jay K. Donald to provide a relatively simple method of calculating distance between two network locations. Various mileage-sensitive services are priced according to the V and H coordinates associated with the two endpoints' CLLI codes.

There are three formats for CLLI codes, but the most commonly used is the Network Entity format, an eleven-character format used to describe the location of network equipment. A CLLI code is composed of four sub-fields:

Four characters to denote the city (formally called the Geographical code),
Two characters to denote the state or province (the Geopolitical code),
Two characters to denote the specific location or building address (the Network-Site code), and
Three characters to specify a particular piece of equipment (the Network Entity code).

Each of the fields is defined fairly precisely, but there is room for interpretation and there are therefore some possiblilties for confusion as shown in the examples below:

Examples

HSTNTXMOCG0

HSTN = Houston
TX = Texas
MO = The AT&T telephone exchange office at 4068 Bellarie Road, known as the "Mohawk office"
CG0 = The first (or perhaps only) analog telephone switch at that location

Telephone companies often give names to their central offices. The names frequently relate to the name given to the exchanges served from that office in the days of two-letter, five-number dialing, where a telephone number might have been referred to as "MOhawk 3-1234". See telephone exchange for more information.

PTLDOR12DS0

PTLD = Portland
OR = Oregon
12 = The Qwest "Atlantic office" at 2911 NE 24th Ave
DS0 = The first (and perhaps only) digital telephone switch at that location

Some telephone companies named their central offices, but did not reflect this name in the CLLI code, as in the above example with a numeric location code.

PTLEORTEDS0

PTLE = Portland
OR = Oregon
TE = A specific address: 6038 NE 78th Court
DS0 = The first (and perhaps only) digital telephone switch at that location

The item to note in the above example is that Portland is usually abbreviated as "PTLD", but because of the relatively small number of possible combinations available in the two-character location code, the city abbreviation must occasionally be modified for locations added later.

DLLSTXRNDS0

DLLS = Dallas
TX = Texas
RN = The Richardson office
DS1 = The second digital telephone switch at that location

Note that this location is actually in Richardson, Texas, not Dallas. Apparently, the organizational structure of Southwestern Bell Telephone at the time considered Richardson to be within its own Dallas organization, although the cities themselves have always been legally separate.

External links

http://www.telcordia.com/resources/commonlang/productshowroom/product/clli_tech/index.html
http://www.telcodata.us
http://www.voip-info.org/wiki/view/V+and+H+Coordinates

Legal

COMMON LANGUAGE is a registered trademark of Telcordia Technologies, Inc.

CLLI is a trademark of Telcordia Technologies, Inc.

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