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Glossary
GL-2
Cisco uBR7225VXR Universal Broadband Router Hardware Installation Guide
OL-17309-02
B
BER
Bit error rate.
C
CATV
Cable television. References to headend or distribution hub.
CCS
Common channel signaling.
CES
Circuit emulation service.
Chrominance
The color portion of a video signal.
CMTS
Cable modem termination system, such as the Cisco uBR7225VXR router.
C/N ratio
Carrier-to-noise ratio.
CNR
Cisco Network Registrar.
CPE
Customer premises equipment.
Critical alarm
An alarm condition that might affect most or all subscribers that connect to the reporting node. To
obtain more information about a problem, use the show facility-alarm status command.
See also Major alarm and Minor alarm.
CSRC
Cisco Subscriber Registration Center.
CSU/DSU
Channel service unit/data service unit.
CTS
Clear To Send.
D
DCD
Data carrier detect.
DCE
Data circuit-terminating equipment (ITU-T expansion). Devices and connections of a
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.
DHCP
Dynamic Host Configuration Protocol.
DNS
Domain Name System.
DOCSIS
Data-over-Cable Service Interface Specification.
DSR
Data set ready.