Zhone Technologies IMACS-200 - Manual (Page 290)

-16 Glossary
Model No. Running Head
Point-to-Point Protocol
PPS
PPhone Foreign Exchange Station port. An interface at the end of the FX line connected to
MBS.
protocol
Procedure or set of rules for communication between two devices.
PSTN
Public Switched Telephone Network.
PTT
Postal, Telephone, and Telegraph authority
PVC
Permanent Virtual Circuit
QAM
Quadrature Amplitude Modulation
RAI
Remote Alarm Indication
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