Encore 24 PORTS NWAY SWITCHING HUB User's Guide Page 183

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Glossary G-9
G
fractional bandwidth DTE loopback
A loopback test that loops back the signal at the network interface.
See also
loopback.
Fractional T1
A service that provides less than full T1 capacity (one or more 64 Kbps
channels are provided).
frame
A group of bits sent serially over a communications channel. The basic data
transmission unit employed with bit oriented protocols.
frame relay
A high-speed packet switching protocol used for wide area networks (WANs);
faster than traditional X.25 networks, because it was designed for today's
reliable circuits and performs less rigorous error detection. Frame relay networks
use bandwidth only when there is trafÞc to send. Frame relay does not support
voice.
framing
A technique which separates incoming bits into identiÞable groups to enable
the receiving device to recognize and reconstruct them.
frame ground
A metallic layer acting as a shield, consisting of tape, braid, wire or sheath and
surrounding insulated conductors in cable. It may be the metallic sheath of the
cable or the metallic layer inside a nonmetallic sheath. It reduces stray
electrical Þelds, prevents outside electrical interference, drains off current
induced by lightning and provides for safety of personnel.
frequency
The number of repetitions per unit time of a complete waveform. The number
of complete cycles per unit of time, usually expressed in Hz.
full bandwidth DTE loopback
A loopback test that loops back the signal at the multiplexer. See also loopback.
H
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