DS92LV0421: Signal distortion on the output

Dear Sir/Madam,

I am using DS92LV0421 as serializer from LVDS input signal to CML output signal. Below is my setup for my measurement:

Here is my input waveform, look ok!

But my output waveform look a bit strange.

With respect to the above mentioned observation we would be grateful if you could help to clarify the below mentioned doubts. 

1. Is our probing points and methods are correct ?
2. Why the CML signal at the Serializer output gives different peak to peak values for different bit “1”s ?
3. If different peak to peak values are acceptable, how to quantify it ?
4. If different peak to peak values are not acceptable, what is the method to correct it in terms of either hardware or software ?
5. Do you have any advice how can I improve my CML output?

Just some of the info with respect to our system that could be useful to you.

• Clock frequency                 =              12 MHz

• Bit rate per LVDS channel =              12x7       =              84Mbps

• Bit rate at the CML output  =              12x7x4   =              336Mbps

Best regards,
kpk