IBM RS/6000 SP, Maintenance Information

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MAP 0560: Block Multiplexer Channel Adapter Feature (BMCA)
MAP 0560: Block Multiplexer Channel Adapter (BMCA)
Notes:
1. The cables and wrap plugs that are shipped with the BMCA feature are different than the standard
RS/6000 cables and wrap plugs.
2. Ensure that customer jobs have been canceled on the BMCA feature and the associated I/O
addresses are varied off-line before servicing.
3. If multiple nodes are failing on the same channel, that parallel channel on the mainframe should be
varied off-line.
4. The maximum allowable adapters on a chain is eight.
5. Refer to Diagnostic Information for Micro Channel Bus Systems (SA38-0532), Map 0020 (Problem
Determination Procedure), Step 3, for additional information on performing diagnostics.
Figure 1-37. BMCA Cabling to Single Processor Node
001
Problem detected with the BMCA feature.
Are multiple processor nodes failing on this channel?
Yes No
002
Only one processor node failing.
– Put the cable connector's Select-out Bypass Switch of the suspect BMCA card in the Bypass (“B”)
position.
– Remove cable from the suspect BMCA card connector.
– Install the BMCA card wrap plug P/N 71F1184 on the card connector.
– Run advanced diagnostics on this BMCA (“cat0”) through the card wrap test.
Did the card and card wrap diagnostics complete successfully?
Yes No
003
– Replace the BMCA card.
– Install the BMCA card wrap plug P/N 71F1184 on the new card connector.
– Run advanced diagnostics on this BMCA (“cat0”) through the card wrap test.
(Step 003 continues)
Chapter 1. Maintenance Analysis Procedures (MAPs)
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