Paradyne 317x E1 manual CRC6

Glossary

CRC6	CRC using six check bits.
CSA	Canadian Standards Association.
CSU	Channel Service Unit. Protects the E1 line from damage and regenerates the E1
	signal.
Ctrl branch	Control branch of the E1 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.
DACS	Digital Access and Cross-connect System. A device that allows DS0 channels to be
	individually rerouted and reconfigured.
daisy chaining	Connecting the COM port of one E1 DSU/CSU to the AUX port of another E1
	DSU/CSU to provide SNMP connectivity.
database	An organized compilation of computerized data.
data port	The electrical interface between the E1 DSU/CSU and the synchronous data
	terminal equipment.
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 E1 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.
DLB	DTE Loopback. Loops the received signal on the DTE Drop/Insert port back to the
	DTE without change.
DL branch	Download branch of the E1 DSU/CSU menu tree.
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.
downstream device	A device that is connected farther from the host computer.
drop/insert	An interconnection point for terminals, multiplexers, and transmission facilities.
	Individual channels may be inserted into the aggregate stream or dropped out to
	accommodate specific applications.
DSR	Data Set Ready. V.24 circuit 107.

3170-A2-GB20-20 December 1996 Glossary-3