Glossary
Glossary-5
3610-A2-GB91-90
July 1999
fallback
Retraining of a V.32 DBM at a lower rate or speed.
FCC
Federal Communications Commission. Board of commissioners that regulates all
interstate and foreign electrical communication systems that originate from the
United States.
Front-End Processor
(FEP)
A communications computer associated with a host computer that manages the
lines and routing of data through the network.
full-duplex
Describes a line discipline characterized by simultaneous two-way transmission.
generator
A circuit in a DSU or in external test equipment that produces a continuous string
or stream of known data patterns.
IEC
InterExchange Carrier. A company that provides inter-LATA (local exchange
carrier) telecommunication services, like AT&T
r
, MCI
r
, and Sprint
r
. Access to
these services can be provided through DDS dedicated channels, T1.5 dedicated
access channel, or digital switched access (DSA) channels.
LADS
Local Area Data Set (also called a limited-distance modem or LDM). This refers to
a mode of operation where the control and tributary DSUs are directly connected
but not passing through a DDS network.
LATA
Local Area Transport Area. A region served by a local exchange carrier (LEC) that
consists of one or more area codes.
LCD
Liquid Crystal Display. A thin sandwich of two sealed glass plates containing liquid
crystal material. When voltage is applied, the amount of light able to pass through
the glass plates is altered so that messages may be ‘‘written” on the display.
LDM
Limited-Distance Modem (also called a local area data set or LADS).
LEC
Local Exchange Carrier. A company that provides intra-LATA (local exchange
carrier) telecommunication services, like NYNEX or Bell South.
LED
Light-Emitting Diode. A light or status indicator on the diagnostic control panel
(DCP) that glows in response to the presence of a certain condition (e.g., Alarm).
link-level address
NMS communications are directed to a tributary via a link-level address. It takes
the form of control network address/tributary network address (e.g., 157/04 — DSU
control address of 157 and tributary address of 04).
Link Problem
Determination Aid
(LPDA)
A series of testing procedures used in NetView that are initiated by the network
control program (NCP) that provides the status of modems and attached devices,
and the overall quality of the link.
LSD
EIA received Line Signal Detect lead (V.24 circuit 109).
modular circuit card
Model 3611 circuit card (DSU, DBM-V, DBM-S, DBM-D, TDM, or MCMP) that is
removable from the front of the carrier without disconnecting the DTE cables.
modular DSU
A Model 3611 DSU circuit card that contains gold finger contacts and is used with
a rear connector plate. This circuit card type is easily removed from the front of the
carrier without disconnecting the DTE cables.
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Страница 246: ...COMSPHERE 3600 Series Data Service Units E 2 July 1999 3610 A2 GB91 90 Figure E 1 Control Channel ...
Страница 247: ...Network Management Connectivity E 3 3610 A2 GB91 90 July 1999 Figure E 2 Extended Control Channel ...
Страница 259: ...Pin Assignments F 11 3610 A2 GB91 90 July 1999 Figure F 8 EIA 232 D Crossover Cable 4951 035F ...
Страница 263: ...Troubleshooting G 3 3610 A2 GB91 90 July 1999 Figure G 2 No Signal NS Condition Troubleshooting ...
Страница 265: ...Troubleshooting G 5 3610 A2 GB91 90 July 1999 Figure G 4 Out of Frame OOF Condition Troubleshooting ...
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