Polycom ViewStation SP, User Manual

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© Polycom, Inc. 159 ViewStation SP User Guide
Glossary
ABC
Annex D The second frame relay standard extension
dealing with the communication and
signaling between customer premises
equipment and frame relay network
equipment for the purpose of querying
network status information.
ATT 4ESS AT&T’s large toll telephone switch. It will
handle 100,000 trunks and over 500,000
attempts at making a call each hour.
ATT 5ESS AT&T Class 5 digital central office.
ADSL Asymmetrical Digital Subscriber Line. A
communications technology used to transmit
digital data over telephone wires. It is
expected to transmit up to six megabits per
second and be used for video-on-demand
services to telephone company customers.
Analog Line A telephone line that transmits and receives
signals in variable, continuous waveforms
that are generated by telephones, fax
machines, models, etc. The signal
transmitted is a true electrical representation
of the original source audio, as opposed to a
“coded” digital signal which must be
“decoded” at the far end.