z/OS Communications Server: SNA Diagnosis Vol 1, Techniques and Procedures
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Channel programs for channel-to-channel adapters: Nonblocking protocol

z/OS Communications Server: SNA Diagnosis Vol 1, Techniques and Procedures
GC27-3667-00

MAXBFRU defines the total number of IOBUF sized read buffers to use to receive data from the CTC. Consequently, the channel program is a series of writes followed by a series of reads for the X-side. For the Y-side, it is a series of reads followed by a series of writes.

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