Panasonic KXTG2226W - 2.4GHZ DIGITAL PHONE, Service Manual

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Channel TX/RX Frequency
(MHz)
Channel TX/RX Frequency
(MHz)
19 2404.60675 39 2436.34950
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.
Fig. 7
14.2.1. TDD Frame Format
The TDD frame is 2mS in length. Each subframe contains 128 bits of 7.8 S duration.
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
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