Toa EXES-6000, Operating And Troubleshooting

Page: 37 / 60

A maximum number of stations that can be used
in the EXES-6000 System in 32 for the EX-600, 64
for the EX-610, 128 for the EX-620 and 256 for the
EX-630. But it is possible to increase the total
number of stations by connecting two or three
exchanges (tie-line connection), except EX-600
which has no tie line function. The explanation is
given to the operation of the Tie-line interface (Tl
unit) and flows of both voice and dial signals in the
tie-lined system.
In Fig. 38, suppose conversation begins after
station No. 200 connected to exchange A places a
call to station No. 470 connected to exchange B.
1. Dial Signal Flow
Trace green line in Fig. 38.
Dial pulse stream generated in station No. 200 is
sent to the LM. It is detected by the dial pulse
detector in the LM, and transmitted to the CP.
Station key number
Pulse number
The CP generates a pulse stream corresponding
to the dial pulse stream and outputs it through OP
(Output Port) of the OC (Output Control Unit) to
the TI.
When the key
is dialed, the pulse stream is
generated from the CP as shown to the right.
The pulse stream from the CP in turn causes
analog switches in the Tl to turn on and off at
10ms intervals (100Hz) for the number of the
pulses.
The signal of 2.6kHz is oscillated in the data
transmitting section of the Tl, which turns into
tone burst signal through on/off operations of the
analog switches.
The Figure shown below is the process to obtain
the tone burst signal when a station dials the keys
— 36 —
VI. TIE-LINE SYSTEM