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Cisco BPX 8600 Series Installation and Configuration
Release 9.3.10, Part Number 78-11603-01 Rev. D0, July 2001
BXM
The Broadband Switch Module (BXM) cards are a series ATM port cards for the BPX switch: BXM-T3/E3,
BXM-155, or BXM-622. These can be configured for either trunk or line (service access) modes. These
cards and support ATM Traffic Management 4.0, including VSVD congestion flow control. Variousport
configurations are supported by the BXM card: 8×DS3, 12×DS3, 4×OC-3, 8×OC-3, 1×OC-12 or 2×OC-12.
The Monarch chipset’s architecture supports up to 64K bi-directional cross-connect legs per BXM card. The
BXM has very flexible input and output queueing facilities, a SAR (Segmentation Assembly and
Reassembly) capability, and a MIPS 4650 control processor.
C
CAS (Channel
Associated
Signalling)
A signalling mode in E1 transmission where the signalling bits for all 30 E1 channels are carried in
timeslot 16. Timeslots 1 to 15 and 17 to 31 carry encoded voice bits only.
CBR (Constant Bit
Rate)
ATM Connection type for constant bit rate traffic such as voice or synchronized data requiring a low
variationindelay.(Seealso,VBRandABR.)
CCDV (Compliant
Cell Delay
Variation)
A parameter utilized in defining ATM Constant Bit Rate service. The amount of delay that is acceptable
between ATM cells for them to be accepted as compliant (usable).
CCITT (Consultive
Committee for
International
Telephone and
Telegraph)
An international telecommunications advisory committee established under the United Nations to
recommend worldwide standards for data and voice communications.
CCS (Common
Channel Signalling)
A carrier signalling mode in E1 transmission where signalling bits are not used. CCS typically
separates user data from signalling information. A signalling channel is used to provide signalling for
all other user data channels in the system.
CDVT (Cell Delay
Variation
Tolerance)
Controls time scale over which the PCR is policed.
Cell
A unit of data with a fixed number of bytes. For ATM the cell size is 53 bytes.
cell relay
A form of digital communications using fixed length cells consisting of data and a small header. IPX
FastPacket was an early implementation of cell relay. The 53 byte ATM cell consists of data and a small
header.
CEPT
CEPT is the European Conference of Posts and Telecommunications Administrations. This association
is comprised of European Telecommunications service providers that participate in relevant areas of
the work of CEN/CENELEC.
CGA (Carrier Group
Alarm)
A major alarm condition for a T1 multiplexer or PABX that results in all channels being taken out of
service.
channel
The logical end point for a connection.
B