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Glossaries

  • Channel Associated Signaling (CAS)
  • Transmitting signaling information over the voice channel. Also called per-trunk signaling (PTS) or "robbed-bit" signaling because it takes up bandwidth that could have otherwise been used by data.
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  • Common Channel Signaling (CCS)
  • Different from CAS, CCS designates a certain channel specifically for signaling. Information on this common channel controls and provides information for all the other data-carrying channels in the system.
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  • Code Division Multiple Access (CDMA)
  • A method in radio communications that divides a shared channel (the radio spectrum) among multiple users through assignment of unique codes. The method is analogous to two users speaking a foreign language in a crowded room.
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  • Compression
  • Data processing that reduces the amount of bandwidth necessary to transmit a signal in a given time or reduce the amount of time for a given bandwidth.
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  • Configuration (CFGN)
  • In terms of computers and telecommunications, configuration is the unique collection of settings that can be tweaked for maximum performance or reliability. It is usually a stored as a file that is executed when the device first boots up.
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  • Cellular Geographic Service Area (CGSA)
  • The physical area over which a cellular provider is licensed to give service.
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  • Competitive Local Exchange Carrier (CLEC)
  • A company that builds and operates communications networks in metropolitan areas (also called a carrier) that are competing with other more established carriers.
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  • Coded Mark Inversion (CMI)
  • A type of line coding used in communications. A zero bit is encoded as half a time period of 1 and the other half as 0, while a one bit is encoded as a full time period at a constant level.
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  • Computerized Management Maintenance System (CMMS)
  • Software system that is meant to assist workers by identifying which devices need maintenance and how. It can also be used to track safety and regulatory compliance.
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  • Co-directional Interface
  • The term co-directional is used to describe an interface across which the information and its associated timing signal are transmitted in the same direction (ITU G.703).
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  • Customer Premises Equipment (CPE)
  • Equipment that resides at the customer's site such as modems, telephones, handsets…etc, that act as terminating equipment or end-point devices for the communications network.
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  • Cyclic Redundancy Check (CRC)
  • Type of error detection method. In the method, the data contents are divided by a large prime number and the remainder is stored with the data as a check-sum value. On retrieval this value is recalculated and compared to the checksum for accuracy. Can be used in both storing and sending data.
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  • Canadian Standards Association (CSA)
  • Standards making organization in Canada, similar to ANSI in the United States, with a focus on safety-related standards.
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  • Control Slip Second (CSS)
  • A one second interval containing one or more "control slips", in which a frame is either repeated or deleted to account for frequency drifting.
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  • Channel Service Unit (CSU)
  • Digital interface device that connects the end-user equipment to the local telephone loop. Also provides maintenance and loopback functionality.
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  • Coarse Wavelength Division Multiplexing (CWDM)
  • The Coarse Wavelength Division Multiplexing is a passive technology which multiplexes up to 18 wavelength (or Lambda) in the same fiber with a spacing of 20nm and working channel passband +/- 6.5nm. The SFP/SFP+ are using the Lambda 1271, 1291, 1311, 1331, 1351, 1371, 1391, 1411, 1431, 1451, 1471, 1491, 1511, 1531, 1551, 1571, 1591 and 1611nm.
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