Verilink AS2000: The Basics (880-502981-001) Product Manual - Manual (Page 131)

Acronyms and Definitions
Verilink Access System 2000: Basics Glossary-11
CPE Customer-provided or customer-
premises equipment.
Craft interface Verilink’s name for accessing
firmware using an ASCII terminal.
See ASCII interface .
CRC-4 See cyclic redundancy check
(CRC) .
CRC-6 See cyclic redundancy check
(CRC) .
CRC error event Occurs when the cyclic
redundancy check (CRC) code in
a received Extended Superframe
Format (ESF) or E1 signal fails to
match the CRC code calculated
locally by the CSU. A CRC error
event indicates that at least one bit
of the frame has not been received
correctly.
CRC-6 regeneration A mode in which the CRC-6 is
recalculated for incoming data
before it is retransmitted. In this
mode, any incoming CRC-6 errors
are not propagated (although the
data may be corrupted). See cyclic
redundancy check (CRC) .
crosspoint switch A device that switches information
between timeslots.
CSES C-bit Severely Errored Seconds. In
DS3 circuits, a second with 44 or
more CCV s OR one or more out-
of-frame (OOF) defects OR a
detected incoming AIS .
CSU See Channel Service Unit (CSU) .
CTS Clear-To-Send (CTS) signal is used
to throttle the flow of data
between a data terminal
equipment (DTE) and a data
circuit- terminating equipment
(DCE) device. The DCE device (i.e.
DSU) can drop the signal to stop
data coming in from the DTE
device and can later raise this
signal to restart the flow of data.
current The amount of electrical charge
flowing past a specified circuit
point per unit of time. Measured
in Ampere (amp).
customer premises equipment (CPE) The equipment (telephones, key
systems, PBXs, modems, video
conferencing, etc.) connected to a
network and residing at a
customer location.
CV-L See code violation—line (CV-L) .