Specifications

Fabric OS Commands
776 Fabric OS Version 3.1.x/4.1.x Reference Guide
Optimum test coverage occurs with lbmode 1, M->M loopback plugs and
splbMode disabled. In this case every port will exchange frames with every
other port and all of the ASIC to ASIC connections are tested.
The frames are continuously transmitted and received in all ports in parallel. The
port LEDs flicker green rapidly while the test is running.
The test method is as follows:
1. Determine which ports are connected to each other.
2. Enable ports for cabled loopback mode.
3. Set up the routing table such that when port M receives frames, they are
routed to its partner port N; and vice versa.
4. Transmit 4 frames of various lengths via port M. The 4 frames used are as
follows:
a. 2112 bytes of BYTE_LFSR,
b. 1000 bytes of CSPAT,
c. 128 bytes of RANDOM, and
d. 512 bytes of RDRAM_PAT.
The partner port N eventually sends 4 similar frames as follows:
a. 2112 bytes of BYTE_LFSR,
b. 928 bytes of CSPAT,
c. 200 bytes of RANDOM, and
d. 480 bytes of RDRAM_PAT.
5. Periodically check that each port has not died, each port's frames transmitted
counter is still incrementing, each port's statistic error counters are non-zero:
ENC_in, CRC_err, TruncFrm, FrmTooLong, BadEOF, Enc_out,
BadOrdSet, DiscC3
until one of the following is met:
a. The number of million frames requested per port are met,
b. All ports are eventually marked bad,
c. The user sends a keyboard (or push button) interrupt to abort.
The data is not read and checked as is done in portloopbacktest and
crossporttest. There is no CPU intervention beyond the periodic checks of
the hardware counters.