Glossary-6
channel expansion module, CEM
A data channel expansion module for an Integration unit that increases
channel capacity depending on the specific module chosen.
channel loopback
A diagnostic test that forms the loop at the multiplexer's channel interface.
character
A letter, number, punctuation, or other symbol contained in a message.
See
also
control character.
CIR, committed information rate
Used to set a predictable level of service to all users on the network, the CIR
is a traffic management mechanism. The user estimates the normal traffic
during a busy period, and the network commits the bandwidth to be
allocated.
circuit
1) In data communications, a means of twoway communication between two
points, consisting of transmit and receive channels. 2) In electronic design,
one or more components that act together to perform one or more functions.
class
A name given to a group of one or more async channels. Classes are used to
group similar ports for network users and may be viewed as a hunt group
where an async user can connect to any available ports in the group.
clock
The timing signal used in synchronous transmission. Also, the source of such
timing signals.
cluster
A group of local area networks which have been assigned the same name and
are attached via Integration units. A means of organizing the LANs to
reduce traffic over a wide area network link. The maximum number of LANs
in a cluster is 12.
CNG (calling) tone
A 1.1 KHz interrupted tone, used by automatic fax machines to indicate that
a fax message is about to be sent.
code
1) A set of rules that specifies the way data is represented, such as ASCII or
EBCDIC. 2) A term used to describe the Integration system software.
