[Asterisk-Users] TDM400P FXS polarity reversal?

[Soren Rathje]

Soren Rathje wrote:
>
> Specs for Si3210 (TDM400P FXS Module) says on page 93:
>
> ---
> Register 72. On-Hook Line Voltage
>
> Bit 6 VSGN On-Hook Line Voltage.
> The value written to this bit sets the on-hook line voltage polarity
> (VTIP–VRING).
>   0 = VTIP–VRING is positive
>   1 = VTIP–VRING is negative
> ---
>

The (missing) link..

https://www.mysilabs.com/public/documents/tpub_doc/dsheet/Wireline/ProSLIC/en/si3210.pdf

Features
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* Software programmable signal generation and audio processing:
  - DTMF generation and decoding
  - 12 kHz/16 kHz pulse metering generation
  - Phase-continuous FSK (caller ID) generation
  - Dual audio tone generators
  - Smooth and abrupt polarity reversal          <<== NB!
  - µ-Law/A-Law and 16-bit linear PCM audio
...
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