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Sonata
Hand Held ISDN Tester—User Guide
A4-12 427869
Terminator A resistor connected across the ends of a transmission line
to provide a constant impedance, to reduce reflection and
distortion of signals travelling down the transmission line.
TNV Telecommunications Network Voltage circuit. A test
circuit for definition of safety in a telecoms system.
Twisted pair Cable in which a pair of wires are twisted around each
other, to minimise noise from other circuits.
Tx Transmit.
U Interface An ISDN reference point between NT1 and the network.
The first reference point at the customer site.
Video text Usually refers to an interactive communication application
in which a user can communicate with a video terminal.
X.25 The packet switched data network.
Xon/Xoff Flow control where the control signal passes in band in
the normal data flow. The special characters XON (11H)
and XOFF (13H) are used to halt and to restart the flow
of data respectively.
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