DS90CR286: DS90CR286: Clock stuck at "1" on the CMOS side of the receiver

Dear TI community,

I have the following problem.

I am trying to connect two boards, one of which has DS90CR285 transmitter and another - DS90CR286 receiver rescpectively. On the first board there are only 14 bits of data fed to the input of the DS90CR285, therefore only two differential channels are used (TxOUT2 and TxOUT3). When I connect these boards with the UTP cable, I can see with the scope that on the differential inputs of the DS90CR286 there is a presence of the running clock going form the first board and through the cable to the receiver. But on the CMOS/TTL side of the DS90CR286 clock line stuck at the logic "1" level. At the current moment, I can't figure out why this is happening. I've checked the cable, in case I've messed up with the data/clock pairs and feed clock line with the data, but it seems that all is OK.

What probably could cause such behavior of the receiver? Is this matter to which data inputs of the DS90CR286 I should wire outputs of the DS90CR285 in case where only two channels are used?
I would be very grateful if you have any suggestions where I should look to solve this matter.

Best regards, Igor.