XID

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   .-XID--=--NO------.   
>>-+-----------------+-----------------------------------------><
   |         .-NO--. |   
   '-XID--=--+-----+-'   
             '-YES-'     

Specifies whether a physical unit on a non-switched SDLC line can identify itself to VTAM through XID.
XID=NO
Indicates an XID is not sent to the physical unit.

For non-switched frame relay PUs, code XID=NO.

XID=YES
Indicates an XID is sent to the physical unit. Code for all physical units that have the ability to receive and respond to an XID in normal disconnect mode.

XID=YES is required for type 2.1 peripheral nodes.