Table of Contents
Advertisement
Glossary
E1
ETSI
FAS
FAW
FCC
FEBE
G.703
HDB3
HDSL
HTU
HTU-C
HTU-M
HTU-R
HTU-S
LED
loopback
loopback
OOF
reset
RTS
RXD
GL-2
A wideband digital interface operating at 2.048 Mbps, defined by ITU recommendations
G.703 and G.704. It is used primarily outside North America.
European Telecommunications Standardization Institute. An organization that produces
technical standards in the area of telecommunications.
Frame Alignment Signal. A loss of signal (LOS) error detection.
Frame Alignment Word. A loss of synchronization error detection.
Federal Communications Commission. The Board of Commissioners that regulates all
electrical communications that originate in the United States.
Far-End Block Error. Block errors reported by remote equipment.
An ITU recommendation for the physical and logical characteristics of hierarchical digital
devices.
High Density Bipolar Three Zeros Substitution. A line coding technique used to
accommodate the ones density requirements of E1 lines.
High-bit-rate Digital Subscriber Line. A technique for high bandwidth, bidirectional
transmission over copper wire for T1 and E1 services.
Host Termination Unit. A generic reference to either an HTU-C or HTU-R module.
Host Termination Unit – Central. The module at the CO (central office) or central site end
of an HDSL connection. Also known as a Line Termination Unit (LTU).
Host Termination Unit – Maintenance. A carrier-mounted module used to perform
maintenance operations on one or more HTU-R and HTU-C modules.
Host Termination Unit – Remote. The module at the CP (customer premises) end of an
HDSL connection. Also known as a Network Termination Unit (NTU).
Host Termination Unit – SNMP. The SNMP-compatible version of the Maintenance
Processor.
Light Emitting Diode. A light or status indicator that glows in response to the presence of a
certain condition (e.g., an alarm).
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.
Out Of Frame. An error condition in which frame synchronization bits are in error.
A reinitialization of the device that occurs at power-up or in response to a reset command.
Request to Send. A signal from the DTE to the device, indicating that the DTE has data to
send. V.24 circuit 105.
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.
March 1998
7900-A2-GB20-00
Advertisement
Table of Contents
