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Glossary
B
Bit error rate.
BER
C
Cable television. References to headend or distribution hub.
CATV
Common channel signaling.
CCS
Circuit emulation service.
CES
The color portion of a video signal.
Chrominance
Cable modem termination system, such as the Cisco uBR7225VXR router.
CMTS
Carrier-to-noise ratio.
C/N ratio
Cisco Network Registrar.
CNR
Customer premises equipment.
CPE
An alarm condition that might affect most or all subscribers that connect to the reporting node. To
Critical alarm
obtain more information about a problem, use the show facility-alarm status command.
See also
Cisco Subscriber Registration Center.
CSRC
Channel service unit/data service unit.
CSU/DSU
Clear To Send.
CTS
D
Data carrier detect.
DCD
Data circuit-terminating equipment (ITU-T expansion). Devices and connections of a
DCE
communications network that comprise the network end of the user-to-network interface. The DCE
provides a physical connection to the network, forwards traffic, and provides a clocking signal used
to synchronize data transmission between DCE and DTE devices. Modems and interface cards are
examples of DCE. Compare with DTE.
Dynamic Host Configuration Protocol.
DHCP
Domain Name System.
DNS
Data-over-Cable Service Interface Specification.
DOCSIS
Data set ready.
DSR
Cisco uBR7225VXR Universal Broadband Router Hardware Installation Guide
GL-2
Major alarm
and
Minor
alarm.
OL-17309-01
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Table of Contents
Troubleshooting
