aurora
Sonata
Hand Held ISDN Tester—User Guide
A4-10 427869
PSTN Public Switched Telephone Network.
PTT National Postal, Telephony and Telegraphy administration.
Public This is usually a network owned and operated by a
Network licensed telecommunication authority, providing a PSTN
service to the public.
Pulse Code A method of converting analogue signals into digital
Modulation signals.
Ringback The signal fed back to a caller to indicate that the called
telephone is ringing.
RJ45 An 8 pin IDC phone connector.
Routing The function which ensures that the correct path through
a network is selected.
RTC Real Time Clock. A calendar clock that is powered from
its own battery and which continues to run even when the
tester is switched off or the power is removed.
Rx Receive.
S Interface A standard interface as defined in the ITU-T
recommendations, which occurs on the terminal
equipment side of the NT1 (e.g. between a TE1 and an
NT1, or between a TA and an NT1). It is an interface to a
192Kbps, 2B+D, 4 wire circuit.
SAPI Service Access Point Identifier. Identifies the service for
which the frame is intended.
Signalling The transmission of information related to switching.
Simulation A mode of operation in which an aurora tester emulates
ISDN equipment or the network itself. The tester can
both transmit and receive information.
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