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DS90UB947-Q1: I2C access to DS90UB948-Q1 on channel 1 and channel 0

Part Number: DS90UB947-Q1

Dear experts,

I'm currently working with the 947-Q1 and the 948-Q1 in combination. 

However my implementation works fine on channel 0, if I plug channel 1 the deserializer is not reachable through I2C Bus. (Channel 0 is left unconnected)

I tried to configure the serializer to pass the I2C Bus on port 1, not on port 0, without success.

The connection is coaxial, but the MODE_SEL 1 pin is configured for STP. Could that be a problem? The minus out-/ input of the FDP- Link is therefore connected to ground.

The serializer is configured to auto-detect the channel. Are there additional configurations to make for the de- or serializer?

Kind regards,

Thore Krakowski