Lucent Technologies SLC ConnectReach User & Service Manual page 528

Glossary
Protocol — An agreed-upon format for transmitting data between two devices. The protocol determines
the following:
The type of error checking to be used
3
Data compression method, if any
3
How the sending device will indicate that it has finished sending a message
3
How the receiving device will indicate that it has received a message.
3
Proxy Server — A server that sits between a client application, such as a Web browser, and a real server.
It intercepts all requests to the real server to see if it can fulfill the requests itself. If not, it forwards the
request to the real server.
Pulse Attenuation — The amount of signal power loss over the T1 span. Valid range is 1 to 32 dB.
PVC — Permanent Virtual Circuit. A logical link established in a packet network assuring an available
connection and bandwidth for subscribers without actually having to set aside physical facilities. A PVC
emulates a dedicated physical connection across a wide area network (WAN).
PVR — Processor Version Register. Displayed as part of hardware configuration statistics.
Pulse Density — The ratio of ones to zeros in a digital data stream. The ones density rule requires at least
three ones in a sampled byte of information.
Q
QOS — Quality of Service. A networking term that specifies a service level.
R
RAI — Remote Alarm Indication. A signal transmitted in the outgoing direction when a terminal determines
that if has lost the incoming signal. RAI is commonly called the Yellow Alarm signal.
RBS — Robbed Bit Signaling (see CAS).
Red Alarm — In T1, a red alarm is generated when a locally detected error such as loss of
synchronization exists for 2.5 seconds.
redirectsent — In statistics reports, such as IP statistics, the number of packets that were redirected to
take the shortest route.
REN — The Ringer Equivalency Number indicates the number of ringers that may be connected to a
single telephone line. If the number of ringers exceeds the REN of the line, some or all of the ringers may
not operate.
GL-10
Issue 4 June 2002
363-208-050