NT5K18 Exchange Line Trunk Card 2-7
UK Trunk cards description 553-3001-173
sends digits in the form of Dual Tone Multifrequency (DTMF) tones or
dial pulses.
Call disconnect
Calls can be disconnected by either Loop Disconnect Clear operation or by
Loop Guarded release operation.
Loop Disconnect Clear operation
The Meridian 1 ends a call by disconnecting the A and B wires for at least
350 milliseconds. The public exchange responds by sending a clear signal,
and the Meridian 1 returns to the idle state when the signal is detected.
The public exchange disconnects a call by sending the disconnect clear
signal, which is done by removing one or both of the idle conditions from
the A and B wires for a timed period. When the Meridian 1 receives the
signal, it returns to the idle state.
Loop Guarded Release operation
The Meridian 1 clears a call by replacing its on-line state by a high
impedance state. When the public exchange detects the high impedance
state, it sends a guarded release signal. Within 220 milliseconds of
receiving the guarded release signal, the Meridian 1 will return to the idle
state.
The public exchange clears a call by sending the guarded release signal,
which is done by removing one or both of the idle conditions on the A and
B wires for a specified time. When the current on the PSTN line has fallen
to less than 1 ma, the Meridian 1 will return to the idle state within 220
milliseconds.
United Kingdom
United Kingdom
United Kingdom
United Kingdom
United Kingdom
United Kingdom
