Glossary-20
link access procedure balanced
See
LAPB.
link access procedure on the Dchannel
See
LAPD.
liquid crystal display, LCD
The 80character display in the front of 5slot Integration units that consists
of two 40character lines. It is used for real time status and alarm messages,
timeofday, and by use of the adjacent keypad, it provides access to
configuration, diagnostics, and administration functions.
local analog loopback
An analog loopback that forms the loop at the line side (analog output) of the
local modem.
local channel loopback
A channel loopback that forms the loop at the input (channel side) of the local
multiplexer.
local composite loopback
A composite loopback that forms the loop at the output (composite side) of
the local unit.
local digital loopback
A digital loopback that forms the loop at the input (digital side) of the local
modem.
local interconnect link
An interconnect link designed for connection between any two Integration
units that are located in close proximity. This link is limited to specific
models.
loopback or loopback test
A type of diagnostic test in which the transmitted signal is returned to the
sending device after passing through all, or a portion of, the data
communications link or network. This allows the technician (or builtin
diagnostic circuit) to compare the returned signal with the transmitted
signal. This comparison provides the basis for evaluating the operational
status of the equipment and the transmission paths through which the signal
traveled.
