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severity. The SIM type (byte 28) indicates the component that experienced the error. When the

value of byte 22 is 21, the SIM is a control unit SIM. When the value of byte 22 is Dx (where x

is an arbitrary character), the SIM is a device SIM.

Figure 18 Typical SIM with reference code and SIM type

NOTE: The SIMs shown below are reported to the host, except 21 81.

The following table shows SIMs reference codes, and provides useful information for identifying

issues and determining the system experiencing the problem. All SIMs are reported to the host,

except 21 80.

Table 20 SIM reference codes, types, and descriptions

SVP log

file

System generating the

SIM

DescriptionSeverityReference code

Byte 23Byte 22

SIM LogPrimary

system/Secondary

system

Logical path is blocked due to a failure.Moderate8021

SSB LogPrimary

system/Secondary

system

Logical path is restored.Service8121

SIM LogPrimary

system/Secondary

system

Line failure is reported by the extender.Moderate8221