Interphase ENTIA 5536 DM PRI, User Manual

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Glossary
5536 PRI RAS Communications Controller Users Guide
207
Excess burst size
‹ (Be) The maximum amount of uncommitted
data (in bits) in excess of Bc that a frame relay network can attempt to
deliver during a time interval Tc. This data (Be) generally is delivered
with a lower probability than Bc. The network treats Be data as discard
eligible. See also
committed burst size (Bc).
Exchange identification (XID)
‹ A specific type of basic link unit that
is used to convey node and link characteristics between adjacent nodes.
XIDs are exchanged between link stations before and during link acti-
vation to establish and negotiate link and node characteristics. They are
exchanged after link activation to communicate changes in these char-
acteristics.
FCC (Federal Communication Commission)
‹
The U.S. government
agency that regulates the telephone industry.
FECN
‹ See Forward explicit congestion notification (FECN) .
Firmware
‹ A computer program or software stored permanently in
flash memory, read-only memory (ROM), programmable read-only
memory (PROM), or stored semi-permanently in erasable programma-
ble read-only memory (EPROM).
Forward explicit congestion notification (FECN)
‹
A bit set by a
frame relay network to notify an interface device (DTE) that conges-
tion avoidance procedures should be initiated by the receiving device.
See also
BECN .
Frame Relay
‹ A wide area networking connection to leased lines,
providing multiple permanent virtual circuits or data link connections
within the same physical access line.
Gateway
‹ Equipment that provides interconnection between two
networks with different communications protocols. Two examples are
packet assembler/disassemblers and protocol converters. Gateways
operate at the 4th through 7th layers of the Open Systems Interconnec-
tion model. Contrast with
bridge , router , repeater.
HDB3 (High Density Bipolar 3)
‹ A method of digitally encoding
data on a link. A modified form of AMI used in Europe.
HDLC (High-level Data Link Control)
‹
A International standard
communications bit oriented protocol developed by the International
Standards Organization. HDLC manages synchronous, code transpar-
ent, serial information transfer over a link connection.
host name
‹ A unique name that identifies each host machine on a
network.
IEC
‹
International Electrotechnical Commission.