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Prestige 782R G.SHDSL Router
Glossary C
more specific kinds of Server programs and each Server requires a specific kind of
Client. A Web Browser, for example, is a specific kind of Client.
CO Central Office. A CO is a facility that serves local telephone subscribers. In the CO,
subscribers' lines are joined to switching equipment that allows them to connect to
each other for both local and long distance calls.
COE Central Office Equipment. A central office is where home and office phone lines
terminate and connect to a much larger switching system.
CPE Customer Premise Equipment is privately-owned telecommunication equipment at an
organization’s site that is attached to the telecommunication network. CPE equipment
includes routers, modems, PBXs, telephones, key systems, facsimile products, voice
processing equipment and video communication equipment.
Crossover
Ethernet Cable
A cable that wires a pin to its opposite pin, for example, RX+ is wired to TX+. This
cable connects two similar devices, for example, two data terminal equipment (DTE) or
data communications equipment (DCE) devices.
Crosstalk Crosstalk is noise emanating from the signals transmitted on adjacent wire pairs.
Crosstalk is caused by electric or magnetic fields of one telecommunication signal
affecting the signal in an adjacent circuit. In a telephone circuit, crosstalk can result in
you hearing part of a voice conversation from another circuit. The phenomenon that
causes crosstalk is called Electro Magnetic Interference (EMI). It can occur in
microcircuits within computers and audio equipment as well as within network circuits.
CSU/DSU Channel Service Unit/Data Service Unit. CSUs and DSUs are actually two separate
devices, but they are used in conjunction and often combined into the same box.
These devices are part of the hardware you need to connect computer equipment to
digital transmission lines. The CSU device connects with the digital communication line
and provides a termination for the digital signal. The DSU device, sometimes called a
digital service unit, is the hardware component you need to transmit digital data over
the hardware channel. This device converts signals from bridges, routers and
multiplexors into the bipolar digital signals used by the digital lines. Multiplexors mix
voice signals and data on the same line.
DCE Data Communications Equipment is typically a modem or other type of communication
device. The DCE sits between the DTE (data terminal equipment) and a transmission
circuit such as a phone line.
Device Filters Your Prestige uses Device Filters to decide whether or not to allow passage of a data
packet and/or to make a call. Device filters act on raw data from/to LAN and WAN,
serve as a limited firewall to your Prestige and may be configured as Device Filter
Rules via the SMT.
DHCP Dynamic Host Configuration Protocol automatically assigns IP addresses to clients
when they log on. DHCP centralizes IP address management on central computers
that run the DHCP server program. DHCP leases addresses for a period of time which