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ACCESS NETWORK DICTIONARY > Characters C
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(ACCESS NETWORK DICTIONARY)
C
CAS (Channel Associated Signaling)
CAS is signaling (for example, in a T-carrier system line) in which control signals, such as those for synchronizing and bounding frames, are carried in the same channels along with voice and data signals. This arrangement is an alternative to CCS (Common Channel Signaling) in which a group of voice-and-data channels share a separate channel that is used only for control signals.
CBR (Constant Bit Rate)
CBR is the service category designed to support applications that need a highly predictable transmission rate. Private lines can be carried over an ATM network in a mode called circuit emulation and use the CBR service category. CBR service maintains the timing relationship between each end during the transmission.
CCS (Common Channel Signaling)
A type of signaling in which a group of voice/data circuits share a signaling channel. Examples: Timeslot# 16 in 30B + D PRA; TS24 in 23B + D PRA.
CDVT (Cell Delay Variation Tolerance)
CDVT defines the maximum tolerance for variation in the time between the arrival of one cell and the next cell that immediately follows it. If cells are transmitted from one point to another with a high level of consistency in the time between each cell transmitted, then the network connection has a low level of delay variation between cells. The CDVT is typically very low for CBR and VBR-RT connections, a bit higher for VBR-NRT connections and very high for ABR and UBR connections.
CDVT (Cell Delay Variation Tolerance)
CDVT specifies the acceptable tolerance of CDV (jitter) in CBR traffic. When cells from two or more ATM connections are multiplexed, cells of a given ATM connection may be delayed while cells of another ATM connection are inserted at the output of the multiplexer. Similarly, some cells may be delayed while physical layer overhead or OAM cells are inserted. Consequently, some randomness may affect the inter-arrival time between consecutive cells of a connection as monitored at the UNI. The upper bound on the clumping measure is the CDVT.
Cell
In ATM, a 53-byte fixed-length data packet consists of a 48-octet payload and 5-octet overhead.
CES (Circuit Emulation Service)
An ATM service which supports constant bit rate (CBR) virtual circuits, and uses AAL1 to emulate existing TDM circuits over ATM networks.
Channelized T1/E1
T1 or E1 services that are divided into individual 64 kbit/s channels (or channels that are multiples of 64 kbit/s such as a 256 kbit/s channel made from four 64 kbit/s channels), as opposed to unchannelized services, which use the entire bandwidth of the T1 (1.544 Mbit/s) or E1 (2.048 Mbit/s). Channelized T1 or E1 lines consist of switched lines with in-band signaling or leased lines.
Class 5 Switch
A Class 5 switch is the local Central Office (CO) that serves as a PSTN entry point for stations, loops, and certain special services lines. Central Office (CO) or Class 5 switches provide telecommunication services - from basic dial-tone to advanced voice services and data network access - to subscribers within a defined locality or local loop. Service providers are enhancing or replacing their traditional Class 5 CO switches with equipment supporting high-speed data transmission and emerging services such as voice over packet.
CLEC (Competitive Local Exchange Carrier)
A CLEC is a company that competes with the already established local telephone business by providing its own network and switching. The term distinguishes new or potential competitors from established Local Exchange Carriers (LEC)
CLR (Cell Loss Ratio)
CLR is the acceptable percentage of cells that the network can discard due to network congestion. An example of a cell loss ratio is 10-4. This particular ratio allows the network to loose 1 in every 10,000 cells. For example, a single DS3 can send 96,000 cells every second.
CORBA (Common Object Request Broker Architecture)
Common Object Request Broker Architecture (CORBA) is an architecture and specification for creating, distributing, and managing distributed program objects in a network. It allows programs at different locations and developed by different vendors to communicate in a network through an "interface broker." CORBA was developed by a consortium of vendors through the Object Management Group (OMG), which currently includes over 500 member companies. Both International Organization for Standardization (ISO) and X/Open have sanctioned CORBA as the standard architecture for distributed objects (which are also known as components).
CPE (Customer Premises Equipment)
A CPE includes any apparatus, including telephone handsets, private branch exchange (PBX) switching equipment, xDSL modem, key and hybrid telephone systems, and add-on devices that are physically located on a customers property. A CPE is housed in the telephone companys central office (CO) or elsewhere in the network. The CPE usually includes wiring.
CSMA/CD (Carrier Senses Multiple Access/Collision Detection)
In this protocol, stations listen to the bus and only transmit when the bus is free. If a collision occurs, the packet is retransmitted after a random time-out. CSMA/CD is used in Ethernet.
CTD (Cell Transfer Delay)
Cell transfer delay relates to how long it takes the network to transmit a cell from one endpoint to another. Sources of delay in the network are physical propagation time, buffer queuing time, and switching time. CBR and VBR-RT connections require low CTD.
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Address : B14/6, Highway 50, Binh Hung Ward, Binh Chanh District, Ho Chi Minh City, Vietnam, HO CHI MINH,8, Vietnam, 84 | Telephone : 0907 555 485
Email : | Instant messenger : sangthanhhuynh (Yahoo!)
Name : SANg HUYNH THANH | Company : ST TELECOM CO.,LTD
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