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6.1.6. FACTORY SERIAL PORT (SEE Fig. 19)
In order to communicate with the handset during manufacture and servicing (using a PC) a serial data link has been provided.
Serial data input/output is provided on J102 (TP151), and a ground is provided on J103. The bi-directional serial data line is split
into two at IC101 pin 27 (input) and pin 26 (output). Data rate is 9600 baud. D105 provides ESD protection, and R117 and C146
provide RF de-coupling.
Serial data input/output is provided on J102 (TP151), and a ground is provided on J103. The bi-directional serial data line is split
into two at IC101 pin 27 (input) and pin 26 (output). Data rate is 9600 baud. D105 provides ESD protection, and R117 and C146
provide RF de-coupling.
6.1.7. AUDIO PATH-RX AUDIO-LINE INPUT (SEE Fig. 20)
Audio from the Line Interface TXAF (TP123) enters the BBIC on pin 58. R111 and C113 are to balance the line input amplifier, into
the ADC part of the codec, where it is sampled and turned into digital data. The burst mode controller then processes this raw data
(called the B-field) performing encryption and scrambling, adding the various other fields that go together to produce the GAP
standard DECT frame, assigning to a time slot and channel etc. The data then passes through the gaussian filter to emerge on pin
22 as TRADAT, (TP132).
the ADC part of the codec, where it is sampled and turned into digital data. The burst mode controller then processes this raw data
(called the B-field) performing encryption and scrambling, adding the various other fields that go together to produce the GAP
standard DECT frame, assigning to a time slot and channel etc. The data then passes through the gaussian filter to emerge on pin
22 as TRADAT, (TP132).
6.1.8. AUDIO PATH - TX AUDIO - LINE OUTPUT (SEE Fig. 20)
Audio from the receiver RECDAT enters the BBIC on pin 20 and passes through the clock recovery circuit. The burst mode
controller separates out the B-field data, and performs de-encryption and de-scrambling as required. It then goes to the DAC part
of the codec where data is turned back into analogue audio. The audio signal is amplified by the gain-controlled line output
amplifier, and balanced audio is output on pin 63, and fed as RXAF (TP120) to the Line Interface.
controller separates out the B-field data, and performs de-encryption and de-scrambling as required. It then goes to the DAC part
of the codec where data is turned back into analogue audio. The audio signal is amplified by the gain-controlled line output
amplifier, and balanced audio is output on pin 63, and fed as RXAF (TP120) to the Line Interface.
Circuit Diagram
17
KX-TCD958RUC
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