Circuit ID CodesXX/YYYY/000000/111/CC/SEG
Pre-fix/service code-service code modifier/serial #/suffix/company identifier/segment name
•Pre-fix= Will set by administration areas for each company. They may or may not be based on LATA
•Service Code= what type of service this circuit is providing
•Service Code Modifier= Modifies the service code, often used for different billing options.
•Serial Number= 6 digit numeric identifier
•Suffix= if a service has multiple legs or drops this will further identify the location. (almost never used.)
•Company identifier= Identifies the controlling LEC (SW= Southwestern Bell, SC= Southcentral Bell, etc.)
•Segment= the drop NAME for a multi point circuit. (not used much any more)
The service code tells you what kind of circuit you have. Here's a list of the most common you'll see:
HC= 1.544 Mbs (T1)
HX= Fractional T1. (Here's where a service code modifier is really used for the Frac. T1 rate.)
IA= ISDN BRI access line
IB= ISDN BRI non-access
XH= 56 Kb DS0
XD= 64Kd DS0
FX= foreign exchange (Telephone numbered format.)
TK= Two way trunk
PD= Private Line Data
PL= Private Line Voice
LX= CLEC POTS
LY= CLEC POTS (improved line conditioning)