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MX2800 M13 Multiplexer User Manual Glossary, Appendix E
61200290L1-1G E-5
IP Internet protocol. A protocol which provides for transmitting blocks of data
between hosts identified by fixed-length addresses.
L
LAN Local area network. A privately owned network that offers high-speed communi-
cations channels to connect information processing equipment in a limited
geographic 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.
M
M13 DS1/DS3 multiplexer that combines up to 28 DS1 channels into one DS3 channel.
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.
N
NC Normally closed. Relay switch contacts that remain closed when inactive.
near end The on-site unit.
NI Network interface. The demarcation point between the CPE and the PSTN.
NO Normally open. Relay switch contacts that remain open when inactive.