Toa EXES-6000, Operating And Troubleshooting

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2. Performance Comparison between New (Used in the EXES-6000)
and Old (used in the EXES-5000) Voice Switches
2-1. Voice Switch Features of Duplex Link Unit (DLU-52, DLU-11A, CPU-16
etc.) for the EXES-5000, the EXES-1000 and the EX-16
Fig. 27 Old Voice Switch Circuit
Quick voice switch response permits easy
interruption in conversation, resulting in high
interruption performance in low noise area,
while in high noise condition, the switching
action is unstable.
Usable under up to 60-phon noise level
Subject to pulsive noise (typewriter, etc.), and
unstable operation in conversation.
Acoustic feedback by echo or reverbration may
cause the circuit to malfunction.
2-2. Voice Switch Features of Duplex Link Unit (DL-62/62A) for the EXES-6000
Improved voice signal detection circuit assures
high performance against pulsive noise and
malfunction due to acoustic feedback.
Sensitivity of the voice signal detection circuit
is controlled automatically according to the
difference of the noise levels between stations.
So, conversation is possible under the noise
levels as high as 70 to 75 phon.
Transient response of the voice switch im-
proved allows comfortable interruption in con-
versation.
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