Table of Contents
Advertisement
MX2800 STS-1 User Manual
L
LAN
local loopback
(LL)
loopback
LOS
M
Mbps
MIB
modem
monitor
multi-point circuit
N
NC
near end
NI
NO
NRZ
61204659L1-1A
Local area network. A privately owned network that offers high-speed communi-
cations channels to connect information processing equipment in a limited
geographic area.
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.
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.
Loss of signal. Defined as a line state in which no pulses are received for 175 bit
positions.
Megabits per second (one million bits per second).
Management information base. A database of network management information
used by SNMP.
Acronym for modulator/demodulator. Equipment that converts digital signals to
and from analog signals. Used to send digital signals over analog phone lines.
To watch or listen to a signal non-intrusively.
A single communications circuit that has more than two terminations.
Normally closed. Relay switch contacts that remain closed when inactive.
The unit on-site.
Network interface. The demarcation point between the CPE and the PSTN.
Normally open. Relay switch contacts that remain open when inactive.
Non return to zero. A mode in which the digital level is low for a 0 bit and high for
a 1 bit, and does not return to zero between successive 1 bits.
Glossary, Appendix E
Glossary Letter L
E-5
Advertisement
Table of Contents
