| |
|
C |
| CAC |
 |
Connection
Admission Control |
| Caching |
|
Speeds information processing by storing information
from a transaction to use for later transactions. |
| CACO |
|
Call Control |
| CAE |
|
Common Applications Environment, computer environment
in which applications can be ported across various
manufacturers' X/Open systems. The CAE contains standards
for the operating system, networking protocols, languages
and data management. |
| CAS |
|
Channel Associated Signalling |
| CASE |
|
Common Application Service Element |
| CAU |
|
Controller Access Unit, a managed concentrator on a
token ring network - ssentially, an intelligent version
of an MAU. Handles the ring in/ring out function. |
| CATV |
|
Community Antenna Television |
| CBR |
|
Constant
Bit Rate |
| CC |
|
Communication
Channel |
| CC |
|
Cluster
Controller |
| CCITT |
|
Consultative Committee for International Telegraph
and Telephone, an international organization that develops
communications standards known as "Recommendations" for
all internally controlled forms of analog and digital
communication |
| CCR |
|
Commitment
Concurrency and Recovery |
| CCS |
|
Common Channel Signaling |
| CDDI |
|
Copper
Distributed Data Interface, FDDI over UTP or STP copper
media. |
| CDPD |
|
Cellular Digital Packet Data |
| CDR |
|
Call
Detailed Records |
| CDV |
|
Cell
Delay Variation |
| |
|
|
| CDVT |
|
Cell
Delay Variation Tolerance |
| Cell
relay |
|
Network
transmission format that uses small packets of uniform
size, called cells. The fixed-length cells can be processed
and transmitted by hardware at very high speeds. Acts
as a basis for SMDS Interface Protocol and ATM. |
| CEV |
|
Controlled Environment Vault |
| Chaining |
|
In
SNA, a grouping of Rus (Request/Response Units) to
aid error recovery. |
| Channel |
|
The
data path between two nodes. |
| CHAP |
|
Challenge Handshake Authentication Protocol. Authentication
scheme for PPP where the password, not only is required
to begin the connection, but alwso is required during
the connection. Failure to provide correct password
during either login or challenge mode will result in
disconnect. |
| Cheapernet |
|
The
IEEE 802.3 10BASE2 standard (or cable used in such
installations). Thinnet, another term for
the standard, specifies a less expensive, thinner version
of traditional Ethernet cable. |
| CICS |
|
Customer Information Control System, an IBM application
subsystem that permits transactions entered at remote
terminals to be processed concurrently by user applications. |
| CID |
|
Channel IDentifier |
| CIR |
|
Committed Information Rate, the transport speed the
frame relay network will maintain between service locations. |
| CLASS |
|
Custom Local Area Switching Service |
| CLEC |
|
Competitive Local Exchange Carrier |
| CLI |
|
Command
Line Interface |
| CLIP |
|
Calling Line Identification Presentation |
| CLNP |
|
Connectionless
Network Protocol, see Connectionless Network Service. |
| CLNS |
|
Connectionless Network Service, packet-switched network
where each packet of data is independent and contains
complete address and control information; can minimize
the effect of individual line failures and distribute
the load more
efficiently across the network. |
| Clock |
|
Any
of the sources of timing signals used in isochronous
data transmission. |
| CLP |
|
Cell
Loss Priority |
| CLR |
|
Cell
Loss Ratio |
| CLSF |
|
Connection
Less Server Function |
| CMIP/CMIS |
|
Common Management Information Protocol/Services, an
OSI-based protocol that provides standard ways to manage
large multivendor networks. |
| CMNS |
|
Connection-Mode
Network Service |
| CMOL |
|
CMIP Over LLC |
| CMOT |
|
CMIP
Over TCP/IP, an Internet standard defining the use
of CMIP (an OSI-based protocol) over TCP for managing
TCP/IP networks. |
| CMT |
|
Connection Management, process in FDDI for controlling
the transition of the ring through its various operating
states (off, connect, active, etc.), under the X3T9.5
specification. |
| CNG |
|
Comfort Noise Generation |
| CO |
|
Central
Office, a local telephone company office which connects
to all local loops in a given area and where
circuit switching of customer lines occurs. |
| Coaxial
cable |
|
An
electrical cable with a solid wire conductor at its
center surrounded by insulating materials and
an outer metal screen conductor with an axis of curvature
coinciding with the inner conductor; hence, "coaxial." Examples
are standard Ethernet cable and Thinwire Ethernet cable. |
| CODEC |
|
Compression Decompression |
| Collapsed |
|
Backbone network architecture under which the backplane
of a device such as a hub performs the function of
a network backbone; the backplane routes traffic between
desktop nodes and between other hubs serving multiple
LANs. |
| Collision |
|
The result of two network nodes transmitting on the
same channel at the same time. The transmitted data
is not usable. |
| Collision
detect |
|
A
signal indicating that one or more stations are contending
with the local station's transmission.
The signal is sent by the Physical layer to the Data
Link layer on an Ethernet/EEE 802.3 node. |
| |
|
|
| Common
carrier |
|
Licensed
utility that provides communications services at government-regulated
rates. |
| Compression |
|
Reducing the size of a data set to lower the bandwidth
or space required for transmission or storage. |
| Concentrator |
|
Device that serves as a wiring hub in star-topology
network. Sometimes refers to a device containing multiple
modules of network equipment. |
| Congestion |
|
Excessive network traffic. |
| Congestion
control |
|
In a frame relay network, the mechanisms (see BECN
and FECN) designed to limit excessive traffic and provide
network switches with a means of alerting the access
note (e.g., a router) to slow its transmission. |
| CONP |
|
Connection-Oriented
Network Protocol |
| CONS |
|
The terminal used to configure network devices at boot
(start-up) time. |
| Console |
|
Connection-Oriented Network Service, an OSI protocol
for packet-switched networks that exchange information
over a virtual circuit (a logical circuit where connection
methods and protocols are pre-established); address
information is exchanged only once. CONS must detect
a virtual circuit between the sending and receiving
systems before it can send packets. |
| Contention |
|
Network access method where devices compete for the
right to access the physical medium. |
| CORBA |
|
Common Object Broker Architecture |
| COSP |
|
Connection-Oriented Session Protocol |
| COT |
|
Central Office Terminal |
| CPCS |
|
Common Part Convergence Sublayer |
| CPE |
|
Customer Premises Equipment, terminating equipment,
such as terminals, phones and modems, supplied by the
phone company, installed at customer sites and connected
to the phone company network. |
| CPS |
|
Common
Part Sublayer |
| CPT |
|
Call Progress Tone |
| CRC |
|
Cyclic
Redundancy Check |
| Crosstalk |
|
Noise
passed between communications cables or device elements. |
| CS |
|
Communication
server, a dedicated, standalone system that manages
communications activities for other computers. |
| CSMA/CD |
|
Carrier-Sense
Multiple Access with Collision Detection, channel access
method used by Ethernet and IEEE 802.3 in which devices
transmit only after finding the data channel clear
for some period of time. When two devices transmit
simultaneously, a collision occurs and the colliding
devices delay their re-transmissions for a random length
of time. |
| CSN |
|
Circuit-Switched
Network, network that establishes a physical circuit
temporarily, until it receives a disconnect signal. |
| CSU/DSU |
|
Channel
Service Unit/Data Service Unit, a digital interface
unit that connects end user equipment to the local
digital telephone loop. |
| CTD |
|
Cell
Transfer Delay |
| CTRL |
|
ConTRoL |
| Cut-through |
|
Technique
for examining incoming packets whereby an Ethernet
switch looks only at the first few bytes of a packet
before forwarding or filtering it. This process is
faster than looking at the whole packet, but it also
allows some bad packets to be forwarded |
| |
|
|
