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How can the hum on the OPX card 7501-16 be stopped?

card hum opx stopped
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How can the hum on the OPX card 7501-16 be stopped?

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The W3 setting jumper must be placed on pin 2-3 when using a fax or modem and on jumper 1-2 when using a telephone. This jumper is located on the station side next to the edge gold connector.

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