| Glossary: C |
| C-bit parity (DS3 CBP) |
A framing format derived from M13. Unlike M13, the C-bits are redefined to allow end-to-end path performance monitoring of the DS3 signal and out-of-band (not payload) data links. |
| C-Message noise |
Noise level measured on a channel in the absence of signal (voiceband). |
| C-Notched noise |
Noise level measured with a 1004-Hz signal present, but removed at the measurement end (voiceband). |
| CAC |
Circuit Access Code |
| CAP |
Carrierless Amplitude Phase (modulation) |
| CAROT |
Centralized Automatic Reporting on Trunks |
| CAS |
Channel Assigned Signaling |
| CBR |
Constant Bit Rate |
| CBT |
Computer-Based Training |
| CCITT |
International Telegraph and Telephone Consultative Committee (ITU-T) |
| CCS |
See Common Channel Signaling. |
| CCU |
Communications Controller Unit |
| CDI |
Customer Disconnect Indicator or Indication |
| CGI |
Common Gateway Interface |
| CenterOp Activate™ |
A Hekimian system that automatically inventories and maintains a database of known network elements and interfaces with them to control the setup, release, and modification of network connections. |
| CenterOp Design™ |
A Hekimian system that lets the user specify the type of service required and the end points. It then extracts network element information from CenterOp Activate, maps the service, and presents it for approval. |
| CenterOp Flow™ |
Hekimian's OSS for automatic (flowthrough) testing of installation work orders and maintenance trouble reports. |
| CenterOp Gateway™ |
A Hekimian customer network management system that allows service providers to seamlessly, automatically deliver and manage today's advanced services across every kind of service, equipment, and supplier within a secure, controlled environment. |
| CenterOp Perform™ |
A Hekimian performance monitoring operations support system designed to facilitate management of wholesale Service Level Agreements between providers. |
| CenterOp Sentry™ |
A system that performs fault management operations including alarm management, fault localization, and fault correction. |
| CenterOp Systems™ |
Hekimian’s new family of TMN-based operations support systems designed to control the fault management and network configuration operations of modern, large-scale telecommunications networks. |
| Central office (CO) |
Any network switching system, although usually a local switching system. Sometimes refers to a telephone company building which houses a switching system. |
| Central processing unit (CPU) |
The part of the computer that accepts data from outside devices, processes them, and delivers them to storage. It contains the arithmetic and logic unit and the control unit. |
| CGN |
Connector Group Network |
| CGNC |
Connector Group Network Controller |
| Channel |
A transmission path between two points. May refer to a one-way path. When paths in the two directions of transmission are always associated, refers to a two-way path. A channel is usually the smallest subdivision of a transmission system by which a single type of communications service (i.e., voice or data) is provided. In channelized testing, a channel is a single 64-kbps signal. |
| Channel bank |
Signal transmission equipment used to combine channels using either time division or frequency division multiplexing |
| Channel Service Unit (CSU) |
A unit located on the customer's site that terminates a channel. Used with the customer's logic and timing recovery circuitry. |
| Channelized testing |
The isolation and testing of a particular data path out of many such paths included in a conglomerate data signal. |
| Checksum |
The sum of a group of data items associated with the group for checking purposes. |
| CIC |
Carrier Identification Code |
| CID |
Craft Interface Device |
| CIR |
Committed Information Rate |
| CIS |
Component Interface Specification |
| Circuit |
A communications path between two or more points. See channel. |
| CLCI™ |
Common Language® Circuit Identification codes |
| CLEI™ |
Common Language Equipment Identification codes |
| CLFI™ |
Common Language Facility Identification codes |
| CLLI™ |
Common Language Location Identification codes |
| CLLM |
Consolidated Link Layer Managemen |
| CLO |
Circuit Layout Order |
| CLP |
Cell Loss Priority |
| Clock |
An oscillator-generated signal that provides a timing reference for a transmission link; used to control the timing of functions such as sampling interval, signaling rate, and duration of signal elements. |
| CMI |
Control Mode Idle |
| CMIP |
Common Management Information Protocol |
| CMISE |
Common Management Information Service Element |
| CNM |
Customer Network Management |
| Coding violation (CV) |
"A digital signal that is received with one or more pulses that do not conform to the expected coding rule; for example |
| Collection hub |
"A collection point for data from a number of end offices. Data is combined into a single bit stream for transmission back to the hub office. A collection hub does not have test capability |
| Common channel signaling (CCS) |
"A signaling method in which a single channel conveys |
| Common Management Information Protocol (CMIP) |
The OSI protocol for network management.
|
| Communications Test System (CTS) |
Hekimian's 3700-series test equipment for analog and channelized testing.
|
| Control signals |
"Signals in byte format used for synchronization |
| CORBA |
Common Object Request Broker Architecture
|
| COS |
Code-Operated Switch
|
| COT |
Central Office Terminal
|
| CPE |
Customer Premises Equipment
|
| CRC |
See Cyclic Redundancy Check.
|
| CRC-4 |
Cyclic Redundancy Check Error (International)
|
| CRC-6 |
Cyclic Redundancy Check Error (U.S.)
|
| CRC-6 block error count |
The total number of CRC-6 block errors that occur during a timed test interval. (Applies to DS1 signals with ESF framing format.)
|
| CRC-6 error |
An error which occurs when the received CRC-6 pattern does not match the computed pattern. (Applies to DS1 signals with ESF framing format.)
|
| Cross-connect |
Hardware that interconnects multiplexers with line terminating equipment and other multiplexers. Access to signals is often available through jacks associated with a test board located near the cross-connect.
|
| Crosstalk |
Interference in a communications channel caused by a signal traveling in an adjacent channel.
|
| CRS |
Continuous Request to Send
|
| CSA |
Carrier Serving Area
|
| CTC |
Centralized Test Center
|
| Current ratio |
The ratio of errors measured during the last ten seconds. Applies to bit error and bipolar violation ratios.
|
| Cyclic redundancy check (CRC) |
A type of block error detection code that is generated by a transmitter from the information bits in the digital bit stream. It is inserted into the bit stream by the transmitter so that a receiver may detect errors. |
| CTP |
(CTP) Convergence Technologies Professional certification - was developed for convergence equipment manufacturers, their channel partners and their end customers |
| CCNT |
(CCNT) Certified in Convergent Network Technologies - certificate program was developed for telcos and other network service providers providing convergence services. |
