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Across the Boards



Communications Device Drivers

Section 5 - General Configuration and Usage Information

Page 188

cfSOFTWARE Confidential,



2000

5.6 VTAM/NCP Issues for Across the Boards

5.6.1 Buffer size problems in cfDFT and other structured field drivers

Environments generating SNA sense codes of X’800A’ (in some drivers, especially cfDFT, reported as

X’0A80’), may have a configuration problem in NCP or VTAM. The sense code is most often

returned after an APPX send operation involving a large structured field. The error is an indication that

the receiver (NCP or VTAM) was unable to handle the PIU, since it was too big. This can be verified

by setting the APPX block size down to 1920, and retrying the connection. It should work.

The problem is in NCP, VTAM or in the destination LU (i.e., CICS). The LU with which the bind was

negotiated has indicated an RU (PIU) size that one of the network components (e.g., VTAM or NCP)

cannot handle. This may be corrected either in the destination LU (by reducing the RU size) or by

increasing the allowed RU sizes in VTAM and/or NCP. Some of the VTAM and NCP parameters that

may need to be changed are listed below:

NCP

MAXDATA

MAXBFRU

VTAM

RACMLUBF (in ISTRACON)

MAXBFRU

It is also possible to alter the MODETAB to specify a smaller RU size.

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Eicon Networks CX1 Dokumentacja Strona 38