Paradyne COMSPHERE
3610, Operator'S Manual

Page: 294 / 310

COMSPHERE 3600 Series Data Service Units
Glossary-2 July 1999 3610-A2-GB91-90
buffer A device for temporary storage of data.
callback directory pointer The directory entry in an originating DBM consists of the answering DBM’s
telephone number, a delimiting character, and a callback pointer. The pointer
identifies the originating DBM’s telephone number in the answering DBM’s
Backup Directory.
carrier The DSU device for mounting circuit cards that contains 17 slots: 1 control slot for
an SDU and 16 DSU, modem, TDM, MCMP, or digital bridge slots.
carrier-mounted A Model 3611 DSU that is designed for installation in a COMSPHERE 3000 Series
Carrier and used at central-site operations. Up to 16 DSUs can be installed per
carrier, with 6 carriers per cabinet.
CCITT The International Consultative Committee for Telegraphy and Telephony, a
committee of the International Telecommunication Union (ITU).
channel A channel is an independent data path used for full-duplex transmission of
customer data. In the 3600 Series DSU with MCMP, the user assigns one of six
physical DTE ports (Ports 1—6) to each of the six available channels
(Channels A–F).
CISC Clear Channel with Integrated Secondary Channel chip. This is the chip that
replaces the 64 CC chip.
cluster controller A device that controls communications processing for multiple terminals.
CMI Control Mode Idle. A control signal sent over the DDS line to indicate that no data
is being sent.
collision A collision occurs when two tributary DSUs transmit data onto the network at the
same time. The transmissions interfere with each other and neither is successfully
received.
comparator A circuit in a DSU or in external test equipment that compares or checks a
generated message for errors and indicates the result of the comparison.
connector module An interface that is shipped with a modular DSU with TDM or MCMP and
installed onto the rear of the 3000 Series Carrier. The module contains six EIA-232
connectors, one for each port. The module also has a 26-pin high-density D-type
connector located at the top of the module for V.35 operation on Port 1 or an
aggregate data path.
control A DSU or modem that is, for diagnostic purposes, at the logical head of a
hierarchical network. It is the unit from which tests and commands are issued to
other units on the same circuit. There is only one control per link.
Control Channel (CC) The diagnostic interface between an NMS and a SDU.
core A function of the circuit card that provides data transmission capability. With 3600
Series DSUs, there are two cores: one for the DSU and one for the DBM. The data
can be transmitted through either (also see active core).
CSA Canadian Standards Association.
CTS State of the EIA Clear-to-Send lead (V.24 circuit 106).