Ethernet
5
A form of contention protocol being commercially deployed by
the Xerox Corporation that is used to tie facilities together in
local geographic areas.
Extended Digital Subscriber Line (EDSL)
A limited service of the Bell System Fast Select. An
information-bearing call request packet for a virtual call. It may
be followed by normal virtual call packet transmissions or may
be followed by an information-bearing call-clearing packet with
no intervening data packet transmissions.
Flow Control The mechanism which ensures that the transmitting entity does
not overrun the receiving entity with more data than it can
accept.
FOI Full Office Initialization.
FRAD Frame Relay Access Device.
Frame The unit of information transferred between two link level
protocol entities. Also, a set of consecutive time slots in which
the position of each time slot can be identified by reference to a
frame alignment signal.
Gateway A node or switch that permits communication between two
dissimilar networks.
Group A number of communications channels handled as a single
entity.
Group Interface Data Bus (GIDB)
Connects the BRI cards to Line Group Controllers.
GUI Graphical User Interface.
Header The initial part of a data block or packet that provides basic
information about the handling of the rest of the block.
Host The 5ESS
®
switch in the Switching Complex.
Host An intelligent processor or device connected to a network that
satisfies the needs of remote users.
HSI High-Speed Interface.
Integrated Services Digital Network (ISDN)
An international plan by the ITU-TS to standardize a public
communication network to handle circuit switched digital voice,
circuit switched data, and packet switched data.
Integrated Services Line Unit 2 (ISLU2)
Terminates T cars, U cards, and Z cards on the DRM.
Intelligent Terminal A data communications terminal that has sufficient intelligence
(processing power) to perform fairly complex interface functions
and local formatting and processing.
Interface The place at which independent systems or devices
communicate with each other.
Interface Units Provide the subscriber interface to the switching module
5. Registered trademark of Xerox Corporation.
235-200-150
May 2003
GLOSSARY
Issue 3.00 Page G-5
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