Siemens C60 data cable with GPRS support. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Siemens C60 data cable with GPRS support. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering /Mobile telephony

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This scheme is the result of combining the most common COM cable options on the MAX 232 chip.

My additions to the base schema:

1) Addition of LEDs for indication of reception - transmission. It's just that it's more convenient to diagnose a broken cable - you can immediately see whether the data is passing through or not.
2) Soldering 1.5 kOhm resistors in the TX and RX lines going to the phone. Without them, the phone turned off every 2-3 minutes due to too high voltages.
3) Grounding 5 and 7 contacts of the phone through 15 kOhm resistors. This is done to support GPRS. The rest of the scheme is standard.

(click to enlarge)

All possible additions and comments are welcome.

Author: Fedoseev Sergey aka FSergey56; Publication: cxem.net

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