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file server
In the context of frame relay network supporting LAN-to-LAN communications,
a device connecting a series of workstations within a given LAN. The device
performs error recover and flow control functions as well as end-to-end
acknowledgment of data during data transfer, thereby significantly reducing
overhead within the frame relay network.
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 cus-
tomer's equipment to frame relay network. See also interface device and encapsu-
lation.
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 multi-
plexed. Contrast with packet switching network.
HDLC
high level data link control. A generic link-level communications protocol devel-
oped by the International Organization for Standardization (ISO). HDLC man-
ages synchronous code-transparent, serial information transfer over a link
connection. See also SDLC.
hop
A single trunk line between two switches in a frame relay network. An estab-
lished 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.
in-band
Signaling (dialing, diagnostics, management, configuration, etc.) over the same
channel used for data.
61203025L1-1
T1 ESF CSU ACE User Manual
Appendix D. Glossary
D-5
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