Microsoft KB Archive/130861

= IBM SNA Formats Bit Ordering is Opposite of Intel Convention =

Article ID: 130861

Article Last Modified on 2/22/2007

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APPLIES TO


 * Microsoft Host Integration Server 2000 Standard Edition
 * Microsoft SNA Server 2.0
 * Microsoft SNA Server 2.1
 * Microsoft SNA Server 3.0
 * Microsoft SNA Server 3.0 Service Pack 4
 * Microsoft SNA Server 4.0

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This article was previously published under Q130861



SUMMARY
In conventional Intel bit ordering, the most significant bit (MSB) is numbered 7 and the least significant bit (LSB) is numbered 0: MSB                        LSB 7  6   5   4   3   2   1   0 In Systems Network Architecture (SNA), IBM defined the LSB and MSB to be the opposite of the Intel convention. The MSB is numbered 0 and the LSB is numbered 7:  MSB                        LSB 0  1   2   3   4   5   6   7 You need to consider the difference in the Intel and IBM conventions when interpreting SNA Server traces using the IBM SNA Formats Guide (part number: GA27-3136-10).



MORE INFORMATION
The following is a sample message in an SNA Server SNA Formats trace: -- 13:51:52.71 >>SEND>> EXCHANGE ID

TH: 0d0000000600

Data Byte 10 |                     V 326605DF FFFF0000 B0041000 00000000     <2f..............> 00010B40 00100900 00000007 00103700    <...@..........7.> 27110C08 04F0F2F0 F0F0F00F 06D4E240    <'....020000..MS@> E2D5C140 E2C5D9E5 C5D90908 F0F0F0F0     F0F0F013 11031000 10F0F0F0 F0F0F0F0    <000......0000000> F0F0F0F0 F0F00E0E F4C1D7D5 C5E34BC3    <000000..4APNETKC> D7D6C9D5 E3C3                          

Byte 10 (=0x10) above in binary is: 0001 0000. It is read from left to right.

Additional query words: prodsna HIS 2000

Keywords: kbinterop kbnetwork KB130861

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