User`s guide

Glossary
GL-2
7800-A2-GB26-80
May 1999
A storage device used to compensate for differences in the data flow rate when
transmitting data from one device to another.
One of a device’s operational states. When a device is in the busy out (or make busy)
state, it will not be able to answer calls. If the busied out device is on a rotary, the rotary
will skip the device when servicing incoming calls. A device that has its dial line busied out
may switch to the service line for further use.
A sequence of successive bits (usually eight) handled as a unit in data transmission.
A carrier is a rack with 17 slots; one control slot (for a Shared Diagnostic Unit) and
16 device slots.
Circuit Card Assembly. A printed circuit board to which separate components are attached.
Consultative Committee on International Telegraphy and Telephony. An advisory
committee established by the United Nations to recommend communications standards
and policies. It was renamed ITU in March 1993.
CCITT standard for local and remote diagnostic loopback tests.
Common Network Management Platform. Used to identify HP OpenView elements that
relate to the ACCULINK 3100 Series products.
A device 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.
The diagnostic communications link to network devices.
Cyclic Redundancy Check. A mathematical method of confirming the integrity of received
digital data.
Controlled Slip Seconds. A period in which a frame was added or deleted because of a
variance in timing.
Channel Service Unit. A device that connects service user equipment such as a DSU to
the local digital telephone loop, protects the line from damage, and regenerates the signal.
The transmission standard that specifies 12 frames as a superframe that is used for frame
synchronization and to locate signaling bits.
Decibel.
A decibel referenced to one milliwatt into 600 ohms. This unit measures relative signal
power.
Data Communications Equipment. The equipment that provides the functions required to
establish, maintain, and end a connection. It also provides the signal conversion required
for communication between the DTE and the network.
Data Channel LoopBack. Loops the data received from the network interface, for all DS0
channels allocated to the selected port, back to the network.
A device operating on a Public Switched Telephone Network (PSTN) line and requiring a
dialing method and protocol to conduct data transmission.
A method of restoring service for data communications during a private line failure by
switching the data traffic to the public telephone network.
One of a leased-line device’s operational states. The Dial Standby mode allows the device
to switch back to leased-line operation while still maintaining the dial line.
A box or window that displays status or configuration information about an object or
subject.
buffer
busied out
byte
carrier
CCA
CCITT
CCITT V.54
CNMP
control
control channel
CRC
CSS
CSU
D4
dB
dBm
DCE
DCLB
dial
dial backup
Dial Standby
dialog