IBM 3745 Series, Hardware Maintenance Reference

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BER Recovery Procedures
Before being logged and stored on the disk, BERs are kept in MOSS and/or CCU
storage. While in this transition stage, the BERs are volatile, and are lost if a
power-OFF or power-ON reset occurs.
MOSS Handling of 3745 Down
The MOSS has stored a BER in the BER stack (in MOSS storage), but could not
log it on the disk. In that case, MOSS will display the error code of the MOSS BER
01 ID 00. Display the BER using the procedure given in the
Service Functions,
SY33-2069. The remaining two digits may be interpreted by referring to page
11-40.
IOC Bus and Adapters
The following three BER types can occur for failures in this area:
Ÿ BER type 10
An error is detected while the control program is involved in a transaction with a
channel adapter.
Ÿ
BER Type 08/11
– An error is detected while the control program is involved in a transaction
with a communication subsystem and the control program has identified the
scanner concerned.
– A specific communication scanner reports an error to the control program.
Ÿ
BER type 14
An error is detected while the control program is involved in a transaction with
an adapter and no adapter can be identified as the source of the error.
Note: A single intermittent error can be reported as BER types 10, 11, or 14,
depending on the time at which the error occurred, and the control program or
microcode transaction that was taking place at that time. In this case, correlation
may be useful to narrow down the range of possible failing components.
Scanner Errors Without BERs
Some errors in a communication scanner may not lead to a BER, although informa-
tion within the scanner is available to help in fault isolation. Use the following pro-
cedure:
1. Start an internal or external SIT. Refer to the 3745 Service Functions.
2. When the problem occurs, stop the SIT.
3. Analyze the SIT. Use the TSS services to display the scanner storage.
11-24
IBM 3745 Models 130, 150, 160, 170, and 17A: Hardware Maintenance Reference