Paradyne 8747, 8777, 8779 manual Loopback, Receiver, Reset, Router

Glossary

loopback	A diagnostic procedure that sends a test message back to its origination point. Used to
	test various portions of a data link in order to isolate an equipment or data line problem.
LOS	Loss of Signal. The line condition where there are no pulses.
LTU	Line Termination Unit. The control unit on the network end of a link. (The NTU is on the
	customer premises end.)
MCC	Management Communications Controller. The DSLAM circuit card used to configure and
	monitor the DSLAM.
M/HDSL	Multirate High-bit-rate Digital Subscriber Line. (See HDSL.)
MIB	Management Information Base. A database of managed objects used by SNMP to provide
	network management information and device control.
MIB II	MIB Release 2. The current Internet-standard MIB, defined by RFC 1213.
M/SDSL	Multirate Symmetric Digital Subscriber Line. (See SDSL.)
NMS	Network Management System. A computer system used for monitoring and controlling
	network devices.
NTU	Network Termination Unit. The unit on the customer premises end of a link. (The LTU is on
	the network end.)
OOF	Out Of Frame. An error condition in which frame synchronization bits are in error.
PPP	Point-to-Point Protocol. A protocol for packet transmission over serial links, specified by
	Internet RFC 1661.
RAI	Remote Alarm Indication. A failure message sent by the remote unit in a link.
receiver	A circuit that accepts data signals from a transmitter.
reset	A reinitialization of the device that occurs at power-up or in response to a reset command.
RLB	Repeater LoopBack. Loops the signal being sent to the network back to the DTE
	Drop/Insert and data ports after it has passed through the framing circuitry of the device.
router	A device that connects LANs by dynamically routing data according to destination and
	available routes.
RTS	Request to Send. A signal from the DTE to the device, indicating that the DTE has data to
	send. V.24 circuit 105.
RXD	Received Data. Pin 3 of the EIA-232 interface that is used by the DTE to receive data from
	the modem. Conversely, the modem uses Pin 3 to transmit data to the DTE.
SDSL	Symmetric Digital Subscriber Line. A technique for the use of an existing twisted-pair line
	that permits high bandwidth, bidirectional transmission.
SES	Severely Errored Seconds. Usually defined as a second during which a specific number of
	CRC errors was exceeded, or an OOF or other critical error occurred.
SNMP	Simple Network Management Protocol. Protocol for open networking management.
T1	A term for a digital carrier facility used to transmit a DS1 formatted digital signal at
	1.544 Mbps. It is used primarily in North America.
TCP/IP	Transmission Control Protocol/Internet Protocol. The dominant protocol suite in the
	worldwide Internet, TCP allows a process on one machine to send data to a process on
	another machine using the IP. TCP can be used as a full-duplex or one-way simplex
	connection.

GL-4 April 2000 8700-A2-GB20-00