Cisco BPX-BXM-155-8DX Installation And Configuration Manual page 606

Glossary
C
Consolidated Link Layer Management. A protocol used to transmit ForeSight messages across the
CLLM
frame relay NNI port.
Cell loss Priority. CLP Hi and CLP Lo thresholds are configurable.
CLP (Cell loss
priority)
Refers to interworking of a connection with respect to the IGX nodes. For example, in a Frame Relay
Complex Gateway
to ATM interworking, the Frame Relay data is extracted from FastPackets and transformed to ATM
cells with redundant overhead bits discarded.
The sum of the data rates for all circuits transmitting on the same synchronous or frame relay data card.
composite data
rate
An RS-232 port on the face plate of a back card for a controller card (BCC, NPC, NPM.) that may used
control port
for connecting a control terminal. This port is bi-directional.
COS (Class of The priority assigned each user connection. Defines which circuits get rerouted first during a network
failure.
Service)
A buffer or queue that serves connections with similar QoS requirements. Also called "qbin" (though a
COS Buffer
qbin is a platform-specific instance, such as a BXM card, of the more general Class of Service Buffer
(CoSB).
A component of a Service Class Template that contains Class of Service Buffer configurations indexed by
Class of Service
(CoS) Buffer CoSB number.
Descriptor A qbin is a platform-specific (BXM in this case) instance of the more general Class of Service Buffer (or
Template
CosB).
There are two separate Command-Line Interfaces on the BPX-LSR: One on the BPX itself and one on the
CLI
MPLS (Multiprotocol Label Switching) Controller. The Control Point integrate these into a single command
line interface.
The CommBus is the BPX's internal messaging protocol. The Switch Control Interface (SCI) that is used
CommBus
by PNNI on the Service Expansion Shelf (SES) is based on CommBus messaging accessed through
interfaces to the BPX cards.
See Class of Service (CoS) Buffer.
CoSB
A software feature that is used to conserve network bandwidth by automatically "downing" a voice
courtesy downing
connection when the signalling status indicates an inactive (on-hook) circuit. The circuit is
automatically "upped" when the circuit becomes active.
A method of error checking that detects errors in a block of data. Unlike parity checks, the CRC can
CRC (Cyclical
detect multiple data errors within the block and thus equipment using a CRC error check can derive a
Redundancy Check)
error rate.
A two-dimensional data switch type that is arranged in a matrix of all input connections along one axis
crosspoint switch
and all output connections along the other axis. Each input and output line has a switch point where the
two axis intersect that can be enabled (switch closed) or disabled (switch open). The central matrix
switch providing the switching matrix for traffic routing by the BPX switch.
A network protection unit that terminates any T1 span line connected to the carrier's central office,
CSU (Channel
Service Unit) providing receive direction regeneration and maintenance loopback for the 1.544 Mbps signal.
Cisco BPX 8600 Series Installation and Configuration
6
Release 9.3.0, Part Number 78-10674-01 Rev. D0, July 2001