ATL Telecom AM2 User Manual
Page 108
ATL User Guide
AM2 G.SHDSL Modem
108
Multiplexer (Mux)
A device that enable two or more signals to simultaneously share a single
transmission path. There are many methods of multiplexing information onto a
transmission path such as "Time Division" and "Frequency Division" Multiplexing.
NAT
(Network Address Translation) Mechanism for reducing the need for global unique
individual IP addresses.
Node
A point of interconnection to a network
NTE
Network Termination Equipment
NTU
Network Termination Unit
Packet
A group of bits (including data and call control signals) transmitted as a whole on a
packet-switching network.
Packet Switching
A data transmission technology, which frames information into, separate packets and
transmits them independently across the network for re-assembly.
PAP
(Password Authentication Protocol) The most basic form of authentication, in which
a user's name and password are transmitted over a network and compared to a table
of name-password pairs.
PBX
(Private Branch Exchange) An exchange system used in companies and organisations
to handle internal and external calls.
PCM
(Pulse Code Modulation) A technique for converting an analogue signal, such as
voice, into a digital bit stream for transmission. The common method samples the
analogue signal at a rate of 8kHz. Each sample is then digitized as an 8 bit coded
word.
PDH
(Plesiochronous Digital Hierarchy) This is an older transmission standard defined by
ITU-T G.702, where transmission rates are independent but kept within a closely
defined range. PDH systems are still widely used for access into the backbone
network.
PING
(Packet InterNet Groper) This is a facility used for testing. It involves sending a test
message (using ICMP) and using the response, if any, to diagnose any possible
problems.
PPP
(Point to Point protocol) A data-link protocol that provides dialup access over serial
lines by encapsulating protocols in specialized Network Control Protocol packets.
These packets can be used to replace a network adapter driver, which allows remote
users can log on to the network as if they were in-house.
PRI
(Primary Rate Interface) An ISDN service that provides 31 64kbps B and 1 D channels
(31B+D), which is equivalent to the channels of an E1 line
PRBS
(Pseudo Random Bit Sequence) A sequence of bits with a random pattern of bits,
which repeats after a number of bits.