Nortel BCM 3.7 Manual page 897

clock sources
This is a feature of DTM and BRI modules that allows you to determine where these
modules receive their synchronization timing for the network.
coldstart
A coldstart occurs when you lose all system programming. You can lose system
programming after a major event such as an extended power failure. If this occurs, you
will need to restore the data to your system from your backup files.
conference
A feature that allows you to establish a three-person call at your telephone. (FEATURE 3)
or the programmed conference/transfer button on the telephone)
configuration
See programming.
control telephone
The control telephone allows you to access the services menus and add or change when
the services run. Manually-activated services take precedence over automatic services.
The control telephone for each DN is configured under the General tab on the DN record.
Coordinated Dialing Plan (CDP)
Refer to CDP.
COS password
The Class of Service password (COS) defines the set of features and lines available to the
user for a call into the Business Communications Manager system. The COS password
determines which restriction filters and remote access packages are active when the caller
uses a specific password. Callers accessing the system from outside the system can change
the Class of Service for a call by entering a six-digit Class of Service password. However,
internal users cannot change their access to features with a COS password, only their
restriction filters. Assign this feature under COS Passwords. (Services, Telephony
Services, General Settings) See also, DISA DN and Auto DN.
CSU
A Channel Service Unit (CSU) device on the digit trunk interface (DTI) that is the
termination point of the T1 lines from the T1 service provider. The CSU collects statistics
on the quality of the T1 signal. The CSU ensures network compliance with FCC rules and
protects the network from harmful signals or voltages.
D
D-channel
A data channel transmission channel which is packet-switched is referred to as a
D-channel. It is used for call setup, signaling and data transmission.
Programming Operations Guide
D 897