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Glossary
8784-A2-GB20-30 February 2001
GL-3
FTP
File Transfer Protocol. A TCP/IP standard protocol that allows a user on one host to access
and transfer files to and from another host over a network, provided that the client supplies
a login identifier and password to the server.
G.703
An ITU recommendation for the physical and logical characteristics of hierarchical digital
devices.
G.704
An ITU recommendation for synchronous frame structures.
HDB3
High Density Bipolar Three Zeros Substitution. A line coding technique used to
accommodate the ones density requirements of E1 lines.
HDSL
High-bit-rate Digital Subscriber Line. A technique for high bandwidth, bidirectional
transmission over copper wire for T1 and E1 services.
IP
Internet Protocol. An open networking protocol used for internet packet delivery.
IP address
Internet Protocol address. The address assigned to an internet host.
LAN
Local Area Network. A privately owned and administered data communications network
limited to a small geographic area.
LED
Light Emitting Diode. A light or status indicator that glows in response to the presence of a
certain condition (e.g., an alarm).
LIU
Line Interface Unit. A physical layer data transmitter and receiver.
LLB
Line LoopBack. A test in which the received signal on the network interface is looped back
to the network without change.
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.
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.
MTSO
Mobile Telephone Switching Office. A generic name for the main cellular switching center
which supports multiple base stations.
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.
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.