Description; Frequency; Time Division Duplex (Tdd) Operation - Panasonic KX-TG2220BXB Service Manual

13 DESCRIPTION

13.1. Frequency

The frequency range of 2426.10875 MHz ~ 2448.63775 MHz is used. Transmitting and receiving channel between base unit and
handset is same frequency. Refer to the Frequency Table.

13.2. 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.
13.2.1. TDD Frame Format
The TDD frame is 2mS in length. Each subframe contains 128 bits of 7.8µS 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)
KX-TG2220BXB / KX-TG2220BXF / KX-TG2220BXS / KX-TGA226BXB / KX-TGA226BXF / KX-TGA226BXS
Fig. 7
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