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LAN
local area network. A privately owned network that offers high-speed communi-
cations channels to connect information processing equipment in a limited geo-
graphic area.
local loopback (LL)
A type of test used to verify the operation of the local terminal equipment, the
CSU, and the connection between the two. The signal from the DTE is looped
back by the CSU and is sent back to the DTE.
loopback
The technique for testing the processing circuitry of a communications device.
May be initiated locally or remotely via a telecommunications circuit. Device
being tested will echo back received test data. The results are compared with the
original data.
LOS
loss of signal. Defined as a line state in which no pulses are received for 175 bit
positions.
M13
DS1/DS3 multiplexer that combines up to 28 DS1 channels into one DS3 chan-
nel. Uses two-stage, bit synchronous TDM.
Mbps
Megabits per second (one million bits per second).
MIB
management information base. A database of network management information
used by SNMP.
modem
Acronym for modulator/demodulator. Equipment that converts digital signals
to and from analog signals. Used to send digital signals over analog phone lines.
monitor
To watch or listen to a signal non-intrusively.
multi-point circuit
A single communications circuit that has more than two terminations.
61200290L1-1
MX2800 User Manual
Appendix D. Glossary
D-7
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