Cisco BPX-BXM-155-8DX Installation And Configuration Manual page 617

Q
ITU-T specifications for the ISDN use network interface (UNI) data link layer.
QQ.921/Q.931
A common-channel message-oriented signalling protocol, defined by the European
QSIG
Telecommunications Standard Institute (ETSI), commonly used by private branch exchanges
(PBXes). The INS Dynamic Network Switching application supports QSIG signalling to the Cisco
WAN switching network.
A buffer that is used to temporarily hold data while it waits to be transmitted to the network or to the
queue
user.
R
Controls the amount by which the cell transmission rate may increase upon receipt of an RM cell.
RRIF (Rate increase
factor)
Controls the amount by which the cell transmission rate may decrease upon receipt of an RM cell.
RDF (Rate decrease
factor)
Another name for local alarm as the local alarm lamp on most digital transmission equipment is red
red alarm
in color.
An alarm indicating that the associated T1 line is down due to a receive line failure on another node.
remote alarm
(See also yellow alarm.)
Also called data frame multiplexing (DFM). An option for data circuits where repeating strings of data
RPS (repetitive
pattern are replaced on the packet line by a single occurrence of the data string and a code that indicates to
suppression)
the far end how may repetitions of the string was being transmitted. Used to conserve network
bandwidth.
A type of signaling used on T1 lines where the signaling bits for each channel are substituted for the
robbed bit signaling
least significant voice bit in each channel word during frames 6 and 12.
In tiered networks terminology, a routing node is a larger switch to which one or more feeders is
Routing Node
attached. Collectively, the feeder(s) and routing node form a type of supernode.
A physical and electrical interface standard for a low-speed, unbalanced, serial, data interface adopted
RS-232
by the EIA committee on data communications. Generally used for data circuits operating at data rates
below 56 Kbps.
Another EIA standard electrical interface for serial data circuits operating at higher data rates than
RS-422/423
RS232. RS422 is a balanced interface; RS423 is unbalanced. Uses RS-449 for the physical interface
(connector).
The physical interface for the RS422 and R423 electrical interfaces. Contains the Processor Controller
RS-449
Card and the PCC utility bus, and provides system timing and control via the system bus.
Release 9.3.0, Part Number 78-10674-01 Rev. D0, July 2001
Cisco BPX 8600 Series Installation and Configuration
Glossary
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