Technical Descriptions; Dect Description - Panasonic KX-TG6671B Service Manual

4 Technical Descriptions

4.1. US-DECT Description
The frequency range of 1.92 GHz-1.93 GHz is used. Transmitting and receiving carrier between base unit and Portable is same
frequency. Refer to Frequency Table (P.61).
4.1.1. TDD Frame Format
Up Link ( Portable - > Base Unit )
RX1 RX2
DATA rate : 1.152 Mbps
4.1.2. 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 - Portables Link
Traffic Bearer
A link is established between base unit and Portable.
The state where duplex communication is performed.
Portable 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 portables.
Portables 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 ms (available) 417 ms (blind)
Traffic Bearer
RX1 RX2 RX3 RX4 RX5 RX6 TX1 TX2 TX3 TX4 TX5 TX6
Base unit
Portable 1
(Stand by)
TX
Portable 2
(Link)
Portable 3
(Link)
Down Link ( Base Unit - > Portable )
TX1 TX2 TX3
Dummy bearer
RX
TX RX
7
KX-TG6671B/KX-TG6672B/KX-TGA660B
5 ms
TX4 TX5 TX6