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Glossary
3160-A2-GB21-90 February 2001
GL-3
COM port
Communications port. A computer’s serial communications port used to transmit to and
receive data from a modem. The modem connects directly to this port.
community name
An identification used by an SNMP manager to grant an SNMP server access rights to a
MIB.
COMSPHERE
A proprietary product family name and a registered trademark of Paradyne.
configuration
The arrangement of a system or network as defined by the characteristics of its functional
units.
configuration option
Device software that sets specific operating parameters for the device. Sometimes referred
to as straps.
CPU fail
Central Processing Unit failure. A Self-Test Health message indicating a failure in the
device’s central processing unit.
CRC
Cyclic Redundancy Check. A mathematical method of confirming the integrity of received
digital data.
CRC6
CRC using six check bits.
CSA
Canadian Standards Association.
CSU
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.
Ctrl branch
Control branch of the DSU/CSU menu tree.
CTS
Clear To Send. A signal indicating that the device is ready for the DTE to transmit data.
Usually occurs in response to Request To Send (RTS).
Cust1
Customer 1 configuration area. The first of two sets of customer-defined configuration
options.
Cust2
Customer 2 configuration area. The second of two sets of customer-defined configuration
options.
D4
The transmission standard that specifies 12 frames as a superframe that is used for frame
synchronization and to locate signaling bits.
daisy chaining
Connecting the COM port of one device to the AUX port of another device to provide SNMP
connectivity.
data port
The electrical interface between the device and the synchronous data terminal equipment.
database
An organized compilation of computerized data.
DB15 connector
A 15-position connector used on cables or devices.
DB25 connector
A 25-position connector used on cables or devices.
DCE
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.
DCLB
Data Channel LoopBack. Loops the data received from the network interface, for all DS0
channels allocated to the selected port, back to the network.
default
A factory-preset value that is assumed to be correct unless changed by the user.
DevFail
Device Failure. A message that indicates that an internal failure has been detected by the
operating firmware. An 8-digit code appears for use by service personnel.
DevHS branch
Device Health and Status branch of the DSU/CSU menu tree.