
ARCHITECTURE
VOICE TONE MODULE BUS
TX/RX PCM
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| VTM |
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| VOICE |
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| CHANNEL |
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| CONVENTIONAL |
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| LOGGING |
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| TELEPHONE |
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| TONE |
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| WIDE |
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| ENCODER |
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| INTERFACE |
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| MODULE |
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| INTERFACE |
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| CHANNEL |
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| AREA |
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| MODULE |
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| MODULE |
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| MODULE |
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| MODULE |
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| MODULE |
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| LEMs |
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| TIMs |
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| CIMs |
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| CCMs |
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| WAMs |
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| SYSTEM |
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| NETWORK |
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| MODULE |
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| SNMs |
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| DISPATCH |
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| CHANNEL |
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| MODULE |
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| DCMs |
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| MASTER SYNC / MASTER CLOCK |
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| Figure |
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3.3.3 VOICE BUS
The following are descriptions of voice buses. Refer to Figure
1. VTM Bus
A 2.048 MHz Pulse Code Modulated (PCM) bus containing 32 slots of tones or voice the modules use to indicate call progress to an end user by means of audio information.
2. Tx PCM BUS
A 2.048 MHz Pulse Code Modulated (PCM) bus containing 32 slots. Audio received from the RF channel is transmitted on these slots by the channel modules and received by the other system modules.
3. Rx PCM Bus
A 2.048 MHz Pulse Code Modulated (PCM) bus contains 32 slots. Audio is transmitted from the other system modules to these slots and received by the channel modules to be transmitted on the RF channel.
4. Master Sync
Provides the synchronization signal for the PCM bus communication to begin the frame of 32 PCM slots.
5. Master Clock
Provides the 2.048 MHz clocking signal for the PCM buses.