Panasonic KX-TG2559LBS, Руководство по обслуживанию

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9 DESCRIPTION
9.1. Frequency
The frequency range of 2.4015 GHz ~ 2.4705 GHz is used. Transmitting and receiving channels between base unit and handset
is same frequency. Refer to the Frequency Table.
9.2. 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 1ch is used in transmitting between the base unit and handset.
Fig. 7
9.2.1. TDD Frame Format
The TDD frame is 2mS in length, and is composed of two symmetrical 960 µS TX and RX subframes. Each subframe contains 96
bits of 10µS duration, with 40µS guard times between both TX and RX subframes.
Each subframe consists of the following five fields:
•
A 12-bit Preamble field
•
An 8-bit Data Channel field
•
An 8-bit Sync Word
•
A 64-bit ADPCM Payload
•
A 4-bit Post-amble
Both the 8-bit sync word and 8-bit data channels are programmable via the DSP interface. In addition, the 64-bit payload
can be filled either with ADPCM voice data, or can be used by the host DSP as a fast data channel between base and
handset.
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KX-TG2559LBS