IBM Midrange System DS4000 Series Hardware Manual page 429

Figure 7-60 Read Link Status Diagnostics window
Error counts are calculated from a baseline. The baseline can be manually reset by pressing
the Set Baseline button.
The columns displayed in the Read Link Status Diagnostics output are:
Devices
Controller/Port
ALPA ID
Baseline Time
Sampling Interval
ITW
LF
LOS
LOSG
PSP
A list of all of the storage subsystems on the Fibre Channel loop. The
storage subsystems appear in channel order, and within each channel
they are sorted according to the storage subsystem's position within
the loop.
The controller ID or the port ID of the device.
The arbitrated loop physical address of the device.
The date and time of when the baseline was last set.
The elapsed time between when the baseline time was set and when
the read link status data was gathered using the Run option.
The total number of invalid transmission word (ITW) errors detected on
the Fibre Channel loop from the baseline time to the current date and
time. ITW might be referred to as the "Received Bad Character Count."
The total number of link failure (LF) errors detected on the Fibre
Channel loop from the baseline time to the current date and time.
The total number of loss of synchronization (LOS) errors detected on
the Fibre Channel loop from the baseline time to the current date and
time.
The total number of loss of signal (LOSG) errors detected on the Fibre
Channel loop from the baseline time to the current date and time.
The total number of primitive sequence protocol (PSP) errors detected
on the Fibre Channel loop from the baseline time to the current date
and time.
Chapter 7. Advanced maintenance, troubleshooting, and diagnostics
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