ADTRAN 4200659L5, 4200659L1, 4175043L2 Mbps, modem, monitor, multi-point circuit, near end

Appendix D. Glossary

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.

NC

Normally closed. Relay switch contacts that remain closed when inactive.

near end

The unit on-site.

NI

Network interface. The demarcation point between the CPE and the PSTN.

NO

Normally open. Relay switch contacts that remain open when inactive.

D-8 MX2800 STS-1 User Manual 61200659L1-1