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61200.175L1-1 FSU 5622 ESP User Manual 141

Glossary

forward explicit congestion notification (FECN)

A bit set by a frame relay network to notify an interface device (DTE) that

congestion avoidance procedures should be initiated by the receiving device. See

also BECN.

frame check sequence (FCS)

The standard 16-bit cyclic redundancy check used for HDLC and frame relay

frames. The FCS detects bit errors occurring in the bits of the frame between the

opening flag and the FCS, and is only effective in detecting errors in frames no

larger than 4096 octets. See also cyclic redundancy check (CRC).

frame-relay-capable interface device

A communications device that performs encapsulation. Frame-relay-capable

routers and bridges are examples of interface devices used to interface the

customer's equipment to frame relay network. See also interface device and

encapsulation.

frame relay frame

A variable-length unit of data, in frame-relay format that is transmitted through a

frame relay network as pure data. Contrast with packet. See also Q.922A.

frame relay network

A telecommunications network based on frame relay technology. Data is

multiplexed. Contrast with packet switching network.

high level data link control (HDLC)

A generic link-level communications protocol developed by the International

Organization for Standardization (ISO). HDLC manages synchronous code-

transparent, serial information transfer over a link connection. See also

synchronous data link control (SDLC).

hop

a single trunk line between two switches in a frame relay network. An

established PVC consists of a certain number of hops, spanning the distance form

the ingress access interface to the egress access interface within the network.

host computer

The primary or controlling computer in a multiple computer operation.

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