In case you need to ground 2N SingleTalk in order to avoid interference of the analogue line, you can use one of the screws placed on the back side (Pic. 1).
Pic.1:
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In case you need to ground 2N SingleTalk in order to avoid interference of the analogue line, you can use one of the screws placed on the back side (Pic. 1).
Pic.1: