Panasonic KX-TG2226B Service Manual page 51

Channel TX/RX Frequency
19 2404.60675
20 2405.12025
14. DESCRIPTION
14.1. Frequency
The frequency range of 2402.04900 MHz ~ 2479.87350 MHz is used. Transmitting and receiving
channel between base unit and handset is same frequency. Refer to the Frequency Table.
14.2. Time Division Duplex (TDD) operation
Transmission/reception between the base unit and handset is performed by time-sharing as
shown in Fig. 7. 1 slot time of transmission and reception is 1mS. Same frequency is used in
transmitting and receiving. The figure shows an example; the frequency of 3ch is used in
transmitting between the base unit and handset.
14.2.1. TDD Frame Format
The TDD frame is 2mS in length. Each subframe contains 128 bits of 7.8
Each subframe consists of the following four fields:
- A 1-bit Preamble field
- An 8-bit Data Channel field
- An 16-bit Sync Word
- A 72-bit ADPCM Payload (Parity 8-bit)
14.3. Signal Flowchart in the Whole System
Channel
(MHz)
TX/RX Frequency
(MHz)
39 2436.34950
Fig. 7
51
S duration.