ADTRAN 1200212L1, Руководство пользователя

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Appendix D. Glossary
61200212L1-1 DSU IQ User Manual D-5
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 cus-
tomer's equipment to frame relay network. See also interface device and encap-
sulation.
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.
frame relay network
A telecommunications network based on frame relay technology. Data is multi-
plexed. Contrast with packet switching network.
gateway
A device which enables information to be exchanged between two dissimilar
systems or networks.
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 synchro-
nous data link control (SDLC).
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.
ingress
Frame relay frames leaving from an access device in a direction toward the
frame relay network.
interface device
Provides the interface between the end device(s) and a frame relay network by
encapsulating the user's native protocol in frame relay frames and sending the