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Glossary
Glossary-33160-A2-GB21-50 January 1997
configuration The arrangement of a system or network as defined by the characteristics of its
functional units.
configuration option Device firmware that establishes 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. Protects the T1 line from damage and regenerates the T1
signal.
Ctrl branch Control branch of the DSU/CSU menu tree.
CTS Clear-to-Send. V.24 circuit 106.
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.
daisy chaining Connecting the COM port of one DSU/CSU to the AUX port of another DSU/CSU
to provide SNMP connectivity.
data port The electrical interface between the DSU/CSU 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 Circuit-terminating Equipment or Data Communications Equipment. A device
which provides signal conversion 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 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.
device A mechanical, electrical, or electronic unit with a special purpose.
digital signal A signal composed of discrete elements (zeros and ones) instead of a great
multitude of analog elements.
diskette A thin, flexible magnetic disk enclose in a protective jacket.
DL branch Download branch of the DSU/CSU menu tree.
DLB DTE Loopback. Loops the received signal on the DTE Drop/Insert port back to the
DTE without change.
download A process that transfers device firmware from a locally-attached PC to a device, or
allows the duplication of firmware from a local device to a remote device.