ADTRAN Express 5210 User Manual page 185

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.
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
frames across the frame relay backbone. See also encapsulation and frame-relay-
capable interface device.
61200208L1-1 Express 5210 User Manual
Appendix D. Glossary
D-5