Toa EXES-6000, Operating And Troubleshooting

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Assume that stations No. 200 and No. 202 are in
the conversation mode through link No. 1.
a) In this event, voice signal flows from station
No. 200 to station No. 202 as follows:
The voice signal is transmitted to the LM unit
after being frequency-modulated in station
No. 200 ..... demodulated into the original
analog signal in the PLL circuit (analog switch-
es Tx
1
, Ty
1
, Rx
1
and Ry
1
close at the same
timing) ..... passes through Tx
1
..... enters the
DL unit through highway HW-T (in link No. 1,
b) The timing chart below shows actual switch
timings and PAM signal wave forms on HW-T
and HW-R in EXES-6000 systems when the
cross-connection is made between Ty
1
and Rx
2
and between Ty
2
and Rx
1
) ..... because Rx
2
stays
open, the voice signal does not pass through
highway HW-R and is held in the link by a holding
capacitor ..... At the next timing Tx
1
, Ty
1
, Rx
1
, and
Ry
1
open, and Tx
3
, Ty
2
, Rx
2
, Ry
3
close ..... the
voice signal held in the link passes through Rx
2
..... enters the LM unit through HW-R ..... passes
through Ry
3
, the only switch that remains closed
among ones connected to HW-R ..... sent out to
station No. 202 connected in base frequency band
after being amplified in the LM unit ..... can be
heard from the speaker of station No. 202
simultaneous conversation is being made be-
tween stations No. 200 and No. 202.
Fig. 16 Timing Chart in Conversation Between
Stations No.200 and No.202
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