Panasonic KX-TG5431BXS, Service Manual

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15.2.1. TDD Frame Format
Sync Field (72bit): Preamble 56bit + SyncW ord 16bit
Base Unit (Handset) adjusts the timing ofreception so that reception ofBase Unit (Handset) can correspond to transmission
ofHandset (Base Unit).
It is necessary for sync-field that Handset gets synchronization.
A - field (64bit): Each kinds of DATA: ch data, line condition, etc.
B - field ( 80bit): Sound data + parity
Z - field (4bit): Parity Check
15.2.2. TDMA system
This system is the cycles of10ms, and has four duplex paths,
so it is possible to perform four duplex communications simultaneously.
In 1 slot 1.25ms, the 10ms ofvoice data is transmitted.
Each slot makes every frame frequency hop. (100hops/sec.)
Although each slot (UpLink3 and UpLink4) uses different frequency, UpLink3 and DownLink3 use the same frequency.
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Handset Link
Traffic Bearer
A link is established between Base Unit and Handset.
The state where duplex communication is performed.
The hopping pattern ofa 3000hops (30 seconds) cycle.
Dummy Bearer
The Base Unit sends Dummy-data to the all stand-by state Handsets.
The Handsets receive that data for keeping synchronization and monitoring request from the Base Unit.
Dummy Bearer doesn´t contain B-field (sound) data.
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KX-TG5431BXS / KX-TGA542BXS