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AM26C31: Question about the parameter in datasheet

Part Number: AM26C31
Other Parts Discussed in Thread: AM26C32

Hi All,

I have some questions about the definition of the parameter in datasheet(AM26C31).

1.  What's the meaning of VID in this table? I think the input can't be a differential input. How can I understand the value (-14~14v)? 

2. What' the definition of Voh and Vol? Is that means: Voh/Vol = output Y - output Z?

if so, what is the different between Voh/Vol and Vod?

Is there a Calculation formula for the TYP value of Voh/Vol?

What' the meaning of the minus 20mA? Why is the current minus.

3. what is the relation of 1.5v and 1.3v in the below picture?

Why is the output Y with 1.3v when the input is low?

How high is the output Y in the high level? 

Thank you for your help in advance!

BR,

Eason Tian