2–16
DECbridge 500/600 Problem Solving
Figure 2–4 (Cont.): Problem Solving the FDDI Interface
Tx power
OK
?
Loopback Test
B
Yes
FI_BAD
on
?
Replace FI module
and retest.
No
No
Yes
Replace FI module
and retest.
A
C
Turn power off. Install loopback
connectors and set loopback
switch on (Section 2.4.5).
Measure Tx power to and from
the bridge (Section 2.4.7).
Record both measurements.
Turn power on and wait
about 1 minute for self-test
to complete.
Remove loopback connectors
and reset loopback switch
to off.
LKG–4117–91I
