Appendix D. Glossary
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
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
NI
network interface. The demarcation point between the CPE and the PSTN.
NO
normally open. Relay switch contacts that remain open when inactive.
NRZ
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.
out-of-band
Signaling that is separated from the channel carrying information (voice, data, video, etc.). Typically the separation is accomplished by a filter. The signaling includes dialing and other supervisory signals.
point-to-point
Type of communications link that connects a single device to another single device, such as a remote terminal to a host computer.
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