Specifications

C-14
Reference Guide
Model No.
Running Head
Red alarm
A local alarm on a T1 line, indicating that a major failure has occurred at this location.
robbed-bit
A type of analog signaling that occasionally “robs” information bits to convey encoded
voice-circuit signaling.
RZ
Return-to-Zero signal format
SAP
Service Access Point
SF
Superframe, a T1 framing format consisting of 12 frames. Also known as D4 framing.
SLC

Subscriber Loop Carrier (made by Lucent Technologies, one example of a Digital Loop
Carrier (DLC) System.
SLIP
Serial Line Internet Protocol
SMDS
Switched Multimegabit Data Service
SNMP
Simple Network Management Protocol
SONET
Synchronous Optical Network
SRU Card
Subrate Unit Card (one of the data cards for this system).