Polycom VIEWSTATION, User Manual

Page: 231 / 250

© Polycom, Inc. 215 ViewStation 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 that must be decoded at
the far end.