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Chapter 8, Signaling Decoder Screen
MPT 1327 Decoder
The SYNC and SYNT patterns are those defined for the MPT 1327 Encoder. (The
defaults are C4D7
16
and 3B28
16
respectively.)
When a synchronization sequence is recognized, the message is placed (timeslot
aligned) into the receive buffer. The receive buffer is organized as 16
× 128 bit
timeslots.
Decoder repetitive retriggering is used to minimize the decoder down-time
between messages. It is therefore important to extract the messages from the
decoder buffer as soon as possible after their arrival. This avoids the messages
being overwritten by further signaling.
Table 7 Triggering the MPT 1327 Decoder
Test Mode Decoder Synchronization Sequence
Off -
Control SYNC
Traffic SYNT
1200Hz 1111
1800Hz 0000
Dotting 1010
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