Terms used as applied to Data (and some Voice) Transmission over Copper Wire

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Channel Bank
Clear Channel











CAP (Carrierless Amplitude and Phase (modulation) -- A two dimensional line modulation code used in higher speed modems. While CAP is used in SDSL, there are two accepted modulation protocols in ADSL; CAP and DMT.

CCITT (Comité Consultatif International Téléphonique et Télégraphique) United Nations advisory committee for international communications systems to which many modem standard are referred. CCITT has been reorganized and newly designated as ITU-T.

Channelized Refers to data that is formatted (characters attached to the content data) for correct destination routing of the data.

Channel Bank- A multiplexer that combines 24 voice grade analog and/or data circuits into a single T1 (DS-1) format. See D2 and D4 Channel Banks

Clear Channel - Refers to the available bandwidth of a channel after any control or signaling information is accounted for. A 64K Clear Channel has the entire 64Kbps available for users.

CLEI (Common Language Equipment Identifier) -- Products that are purchased by most TELCOs requires a CLEI number on the equipment they install. The CLEI is assigned by Bellcore when the equipment is registered by Bellcore. See PID

Client -- May be a hardware or software device. Hardware: a device such as a terminal, which is used to contact a server, router or like device. Software: a program that is used to contact and obtain data from a Server software program on another computer - A Web Browser is a specific kind of Client.

Co-Locate -- The Telecommunications ACT of 1996 requires telephone companies to lease up to 20% of their facilities to other competitive access providers. Pursuant to this requirement, the telephone companies allocated space within their facilities that house the wires and other resources as defined in the ACT. This space is designated as the Co-Locate area where these competitors are allowed physical access to their leased resources.

COT (Central Office Terminal (Termination)) -- An acronym indicating the equipment installed on the Central Office site (normally, but not necessarily, the Telco side) See: CPE, ATU-C, ATU-R

CPE (Customer Premises Equipment) -- An acronym indicating the equipment installed on the customers, or clients site or physical location. See: COT, ATU-C, ATU-R

Cross-Connect -- Device that can connect one of a set of signals on one the side of that device to another set of signal to the other side of that device. A telephone company's switching office is a type of Cross-Connect switch, because it connects one <of many> telephones on one side of the central office, to one <of many> telephones on the other side of the central office. Cross-Connect devices can be hardware type that switch hard circuits, or can be 'soft' cross-connects that connect data packets of information from one circuit to another.

CSA (Carrier Service Area) - Normally refers to the service area capabilities of a CO (Central Office) which refers to the physical area that circumferences a CO location- typically a radius about 1-2 miles. (CSA is also known as an acronym for "Canadian Standards Association") -kinda like UL in the USA - no relationship.


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