Interphase-tech RAS Communications Controller 5536 Uživatelský manuál Strana 224

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Glossary
204 Interphase Corporation
Configuration cycle A type of I/O cycle provided on the PCI bus to
facilitate system configuration.
CPE (Customer-Premises Equipment) All equipment that resides
past the telephone service demarcation point. In the U.S. This typically
includes the NT1 and all ISDN devices. Customer equipment may also
include inside wiring as well as telephone modems, and ISDN equip-
ment.
CRC (Cyclic Redundancy Check) A bit errors detection technique
that employs an algorithm to calculate a value for the information bits
in a packet. The receiver, using the same algorithm, recalculates that
value and compares it to the value received. If the two values do not
agree, the transmitted packet is considered to be in error.
CSD (Circuit Switched Data) A dial-up data communications chan-
nel which, once established, looks like a transparent data pipe. Also,
the type of ISDN service required to utilize this capability of an ISDN
circuit. Contrast with CSV.
CSU/DSU (Channel Service Unit/ Data Service Unit) A device that
incorporates the functions of a CSU and a DSU, and interfaces
between a Switched-56 (or Dedicated Digital Service) line and a user's
data equipment.
CSV (Circuit Switched Voice) A dial-up communications circuit
for voice grade communication. Also, the type of ISDN service
required to use this capability of an ISDN circuit. Contrast with CSD.
CTS (Clear To Send) RS-232 (V.24) interface control signal (sent
from the data communications equipment to the data terminal equip-
ment on pin 5) indicating that the attached DTE may begin transmit-
ting. Issued in response to the DTE’s request-to-send. (See RS-232.)
Data link control (DLC) A set of rules used by nodes on a data link
(such as an SDLC link or a token ring) to accomplish an orderly
exchange of information.
Data link control identifier (DLCI) The numeric identifier of a
frame-relay subport or PVC segment in a frame-relay network. Each
subport in a single frame-relay port has a unique DLCI. The following
table, excerpted from the American National Standards Institute
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