Cisco BPX 8650, Installation And Configuration Manual

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Glossary
GL-17
Cisco BPX 8600 Series Installation and Configuration
Release 9.3.30, Part Number 78-12907-01 Rev. E0, May 2005
port
Refers to a signal connection on a data back card that interfaces to a customer circuit or data device.
The number of ports on a card ranges from 1 to 8 depending on the particular card type.
“Port” is synonymous with “Interface.”
The VSI makes no distinction between trunk ports and end-point ports.
port concentrator
shelf
See PCS.
PRI
primary rate interface.
An ISDN interface to primary rate access. Primary rate access consists of a single D channel for
signaling and 23 (T1) or 30 (E1) B (bearer) channels for user data. A PRI is typically carried on T1
or E1 facilities.
primary rate
interface
See PRI.
privilege level
A level between 1 and 6 that is assigned to each command. Each operator is assigned a privilege level
by the system administrator. The operator may only access and execute commands equal to or lower
than his or her own privilege level. Level 1 is the highest and level 6 is the lowest.
private branch
exchange
See PBX.
private
network-to-network
interface
See PNNI.
pulse code
modulation
See PCM.
PVC
permanent virtual connection or circuit.
Connections that are assigned but not connected until data is sent, thereby not using bandwidth when
idle.
Q
QQ.921/Q.931
ITU-T specifications for the ISDN use network interface (UNI) data link layer.
Q (point of the ISDN
model) Signaling
See QSIG.
QSIG
Q (point of the ISDN model) Signaling.
A common-channel message-oriented signaling protocol, defined by the European
Telecommunications Standard Institute (ETSI), commonly used by private branch exchanges
(PBXes). The INS Dynamic Network Switching application supports QSIG signaling to the Cisco
WAN switching network.
queue
A buffer that is used to temporarily hold data while it waits to be transmitted to the network or to the
user.