Diagnostic Tests - IBM SAN40B-4 - System Storage Switch User & Service Manual

With this command, only one frame is transmitted and received at a time. No
external cable is required to run this test. The port LEDs flicker rapidly (green) while
the test is running.
The test performs the following operations:
10. Replace the SFP with an SFP known to be good.
11. Simulate the data transmission scenario when the error occurred. If the error
12. Simulate the data transmission scenario again to verify that the problem does

Diagnostic tests

In addition to POST, Fabric OS includes diagnostic tests to help troubleshoot the
hardware and the firmware. This includes tests of internal connections and circuitry,
fixed media, and the SFPs and cables in use.
The tests are implemented by command, either through a Telnet session or through
a terminal set up for a serial connection to the switch. Some tests require the ports
to be connected by external cables, to allow diagnostics to verify the
serializer/deserializer interface, SFP, and cable.
All diagnostic tests are run at link speeds of 1, 2, 4, and 8 Gbps, depending on the
speed of the link being tested.
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SAN40B-4 Installation, Service, and User's Guide
1. Sets all ports for parallel loopback.
2. Creates a frame F of maximum data size (2,112 bytes).
3. Transmits the frame F through port "N".
4. Picks up the frame from the same port "N".
5. Checks the eight statistic error counters for nonzero values:
ENC_in, CRC_err, TruncFrm, FrmTooLong, BadEOF, Enc_out, BadOrdSet, DiscC3
6. Checks whether the transmit, receive, or class 3 receiver counters are stuck at
some value.
7. Checks whether the number of frames transmitted is not equal to the number
of frames received.
8. Repeats Steps 2 through 7 for all ports until one of the following conditions are
met:
a. The number of frames (or passcount) requested is reached.
b. All ports are marked bad.
At each pass, the frame is created from a different data type. If seven passes
are requested, seven different data types are used in the test. If eight passes
are requested, the first seven frames use unique data types, and the eighth is
the same as the first. The seven data types are:
CSPAT: 0x7e, 0x7e, 0x7e, 0x7e, ...
BYTE_LFSR: 0x69, 0x01, 0x02, 0x05, ...
CHALF_SQ: 0x4a, 0x4a, 0x4a, 0x4a, ...
QUAD_NOT: 0x00, 0xff, 0x00, 0xff, ...
CQTR_SQ: 0x78, 0x78, 0x78, 0x78, ...
CRPAT: 0xbc, 0xbc, 0x23, 0x47, ...
RANDOM: 0x25, 0x7f, 0x6e, 0x9a, ....
9. If the test indicates that all ports are good, the problem is associated with
either the cable or SFP.
does not reappear, the original SFP was defective, and should be discarded. If
the error does reappear, the cable is defective. Replace the cable and discard
the original cable.
not reappear.