How do you want Switch to appear to Asterisk.
1. As an extension. Then use an FXS connection to a CO line input.
The extension interface at the PBX will be supplying battery and dial tone. Therefore, you would want to use the FXO (red) daughter board on your TDM400P card.
2. As a CO line. Then use an FXO connection to an Extension output.
The trunk interface at the PBX will be receiving battery and dial tone. Therefore, you would want to use the FXS (green) daughter board on your TDM400P.
Having said that... If yours is an enterprise application then I would certainly investigate whether to use a T-1 interface between the two systems.
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