EXTender 1100A Switch and Remote Module System Administrator’s
Guide
99
Companding
A type of signal processing in which the signal is
compressed on input and expanded back to its original form
on output. Digital companding allows a device to achieve a
greater apparent dynamic range with fewer bits per sample
word.
Compression
A technology that reduces the size of a file. Compression
programs are valuable to network adminstrators because
they help save both time and bandwidth.
Console
An interactive terminal connected to a computer or electronic
system usually for the purposes of administration.
D
Daemon
A program that runs unattended to perform continuous or
periodic systemwide functions, such as network monitoring
or control.
dB
A unit used to convey the intensity of sound.
DB9
On a PC, the serial port is a DB9 male connector. It has 9
pins arranged in two rows, with one row on top of the other.
DHCP
Short for Dynamic Host Configuration Protocol, a protocol
for assigning dynamic IP addresses to devices on a network.
With dynamic addressing, a device can have a different IP
address every time it connects to the network. DHCP also
supports a mix of static and dynamic IP addresses.
Dial Tone
This sound signifies that a telephone is ready to receive
instruction (i.e. make a call).
Digital Phones
A telephone that uses signaling rather than pulses (as in an
analog phone). Most PBXs/KTSs use digital phones as the
user interface.
Domain Name
A domain name is the text name corresponding to the
numeric IP address of a computer on the Internet.
DTMF
Dual Tone Multi-Frequency; better known as a Touch Tone.
The tones generated by touching the keys on the phone are
used for a variety of purposes including voice mail systems
and voice messaging.
Duty Cycle
In an ideal pulse train (one having rectangular pulses) it’s
the ratio of the pulse duration to the pulse period.
E
Echo
An interference present on telephone circuits in which
transmitted signals are reflected back to the source from the
terminating end. This is usually overcome by the telephone
company by the installation of echo suppressors in the
transmission path which absorb the echo when each party is
talking.
EXTender
A communications solution offered by Citel Technologies
that allows for seamlessly connecting remote offices to the
corporate PBX or KTS. The EXTender resides at the remote
site.
Extensions
A telephone extension is an internal telephone line attached
to a PBX or KTS.
ETI
The Ensemble Transport Interface. The uni-directional
transport protocol used for the internal network distibution
of DAB (Digital Audio Broadcast) channel broadcasts
Document Number: M-1100A-MUC
Version: Rev AG
© Copyright 2008 Citel plc All Rights Reserved
