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KX-TG7731S/KX-TG7732S/KX-TG7733S/KX-TGA470S
4.2.
US-DECT Description
The frequency range of 1.92 GHz-1.93 GHz is used. Transmitting and receiving carrier between base unit and handset is same
frequency. Refer to Frequency Table (P.65).
4.2.1.
TDD Frame Format
Up Link ( Handset - > Base Unit )
RX1
RX2
DATA rate : 1.152 Mbps
4.2.2.
TDMA system
This system is the cycles of 10 ms, and has 6 duplex paths, but maximum duplex communication path is 5 because of dummy
bearer use.
In 1 slot 417 µs, the 10 ms of voice data is transmitted.
• 2 - Handsets Link
Traffic Bearer
A link is established between base unit and handset.
The state where duplex communication is performed.
Handset doesn't make up duplex in no free RF channels because of interference. (*1)
Dummy Bearer
Base unit sends Dummy-data to the all stand-by state handsets.
Handsets receive that data for synchronization and monitoring request from the base unit.
Base unit doesn't send Dummy bearer in no free RF channels because of interference. (*1)
Note:
(*1) It is a feature under FCC 15 regulation and for interference avoidance.
In the case of checking RF parts, it is better in least interference condition.
5 ms
RX3
RX4
RX5
RX6
417 µs (available) 417 µs (blind)
Traffic Bearer
RX1 RX2 RX3 RX4 RX5 RX6 TX1 TX2 TX3 TX4 TX5 TX6
Base unit
Handset 1
(Stand by)
Handset 2
TX
(Link)
Handset 3
(Link)
Down Link ( Base Unit - > Handset )
TX1
TX2
TX3
Dummy bearer
RX
TX
RX
8
5 ms
TX4
TX5
TX6
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