Glossary
3160-A2-GB24-10 March 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 12frames as a superframe that is used for frame
synchronization and to locate signalingbits.
daisy chaining Connecting the COM port of one device to the AUX port of another device to p ro vide 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 p rovid es the s ignal c onv ers ion requi red f or
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.