User manual

Wide Bank 28 DS3 - Release 2.4 July 2004 Glossary-7
Glossary
C-bit Errored
Seconds
CES. A second with one or more CCVs OR one or more Out of Frame defects OR a
detected incoming AIS. This count is only for the SYNTRAN and C-bit Parity DS3
applications. This gauge is not incremented when UASs are counted.
C-bit Parity Framing A DS3 frame format with overhead communications bits. Unlike M23 framing, C-bit parity
framing does not require a stuffing indicator (stuffing is always present), so the C-bits are
used to carry alarms, data, and status information. See Stuffing.
C-bit Severely
Errored Seconds
CSES. A second with 44 or more CCVs OR one or more Out of Frame defects OR a
detected incoming AIS. This count is only for the SYNTRAN and C-bit Parity DS3
applications. This gauge is not incremented when UAS are counted.
Channel The smallest subdivision of a circuit that provides a type of communication service; usually
a path with only one direction.
Circuit A communications path or network; usually a pair of channels providing bi-directional
communication.
Circuit Identifier A character string assigned by the circuit vendor, which is useful when communicating
with the vendor during the troubleshooting process.
Circuit Switching Basic switching process whereby a circuit between two users is opened on demand and
maintained for their exclusive use for the duration of the transmission.
Coding Violation CV. A transmission error detected by the difference between the transmitted and the locally
calculated bit-interleaved parity.
Comite Consultatif
Internationale de
Telegraphique et
Telephonique
CCITT. The technical organs of the United Nations specialized agency for
telecommunications, now the International Telecommunications Union - Telecom. They
function through international committees of telephone administrations and private
operating agencies.
Community Name String that defines an administrative relationship between SNMP entities.
Conference of Postal
and Telecommunica-
tions Administra-
tions
CEPT. The European CEPT format defines the 2.048 Mbps European E1 signal made up
of 30 voice-frequency channels.
CRC-6 A six-bit Cyclical Redundancy Check code embedded in the ESF frame and used to verify
data transmission. If the transmitted and received CRC-6 codes match, it is highly probable
that the ESF field arrived without error; however, if the CRC-6s do not match, one or more
errors have occurred during the transmission of that particular ESF field. CRC-6 error
events are logged into internal pairs of registers within the CSU and may be recalled
through the 4 Kbps Facility Data Link (FDL) by the customer and the carrier.