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Which service uses telephone control messages and signals
between
the transfer points along the way to the called destination?
A. Signaling System 7 (SS7)
B. Time-division Multiplexing (TDM)
C. X.25
D. Frame relay
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Answer:: A
Signaling System 7 (SS7) uses telephone control messages and
signals
between the transfer points along the way to the called
destination.
Time-division Multiplexing (TDM) has information from
multiple sources
and allocates bandwidth on a single media. Circuit switching
uses
signaling to determine the call route, which is a dedicated
path between
the sender and the receiver. Basic telephone service and
Integrated
Services Digital Network (ISDN) use TDM circuits. X.25 and
Frame Relay
services have information contained in packets or frames to
share
non-dedicated bandwidth. X.25 avoids delays for call setup.
Frame Relay
uses permanent virtual circuits (PVCs).
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