XI queue type

Prefix	Short descript.
Xbt1	High priority sender/is inbound EO queue
Xbt9	Low priority sender/is inbound EO queue
Xbq1	High priority sender/is inbound eoio queue
Xbq9	Low priority sender/is inbound eoio queue
Xbta	High priority extends ER/is outbound EO queue
Xbtz	Low priority extends ER/is outbound EO queue
Xbqa	High priority extends ER/is outbound eoio queue
Xbqz	Low priority extends ER/is outbound eoio queue
Xbtx	High priority acknowledgment EO queue
Xbty	Low priority acknowledgment EO queue
Xbqx	High priority acknowledgment eoio queue
Xbqy	Low priority acknowledgment eoio queue
Xbtm	Queue for large EO messages in is outbound Channel