Black Box Compact T1 MT850A, Руководство пользователя

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Compact T1 - Release 6.1 Glossary-9
Glossary
ground
ground A physical connection to the earth or other reference point.
ground start A method of signaling on subscriber trunks in which one side of the two
wire trunk (typically the ring conductor of Tip and Ring) is momentarily
grounded to get dial tone
Hops Each individual short trip that packets make from router to router, as they
are routed to their destination.
impedance The total opposition a circuit offers to the flow of alternating current. It
is measured in ohms and the lower the ohmic value, the better the quality
of the conductor
Integrated
Services Digital
Network BRI, which is 144,000 bits per second and designed for the desktop.
Local Area
Network LAN. A short distance data communications network (typically within a
building or campus) used to link together computers and peripheral
devices under some form of standard control.
layer 2 In the OSI 7 layer model, layer 2 is the Data Link layer. This layer deals
with procedures and protocols from operating the communications lines.
It also has a way of detecting and correcting message errors
Line Build Out LBO.
Local Link
Control A protocol developed by the IEEE 802.2 committee for data-link-level
transmission control
Local
Management
Interface A specification for the use of frame-relay products that define a method
of exchanging status information between devices such as routers
latching OCU-DP loopback
loopback A diagnostic test in which a signal is transmitted across a medium while
the sending device waits for its return.