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1813 VoIP Gateway User’s Guide
LOC: Loss of Cell delineation. A situation where receiving equipment is unable to identify the
boundaries of a cell.
local analog loopback: A test in which the modem’s VF signal is looped to its receiver.
local loop: An ordinary telephone line.
local loopback test: An analog loopback test that loops a device’s transmitter output back to
receiver input.
loopback: A diagnostic procedure where a test message is sent back to its origination point, in
order to isolate an equipment or data line problem.
LOS: Loss of Signal. A digital line condition where there are no pulses.
MAC address: Media Access Control address. The unique fixed address of a piece of
hardware, normally set at the time of manufacture and used in PAT protocols.
MAC: Medium Access Control, a protocol for determining which device has access to the
network at any one time.
Mbps: Megabits per second. One megabit is 1,048,576 (10242) bits.
MCU: Multi-Commercial Unit. A commercial building or complex with multiple tenants.
MDU: Multi-Dwelling Unit. A residential building with multiple tenants.
MIB II: MIB Release 2. An update of the MIB standard, defined by RFC 1213.
MIB: Management Information Base. A database of managed objects used by network
management protocols to provide network management information and device control.
modem: Modulator Demodulator. A device used to convert a digital signal into an analog signal
and vice-versa so that data can be transmitted over a telephone line.
modulation: The process of varying the amplitude, frequency, or phase of a carrier wave to
form data transmissions.
multicasting: The ability of a network node to send the same data to multiple endpoints.
multiframe: An ordered, functional sequence of frames on a multiplexed digital circuit.
NAT: Network Address Translation is a transparent routing function that translates a Private IP
address on a PAT into a Public address that can be used in a public network.
network address: The network portion of an IP address.
network protocol: Network protocols encapsulate and forward data packets from one interface
to another.
NIC: A Network Interface Card is a card installed in a device to provide network
communication capabilities to and from that device.
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