IBM 8239 Token-Ring Stackable Hub, Setup And User Manual

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Table 5-8 (Page 2 of 4). Stack-In Status
Green
(Data In) Yellow
(DI/CI
Status) Green
(Control In) Meaning
Off On On Fault detected in Data In; Data In is wrapped.
Cause Action
Stack cable connected to incorrect port
Make sure that Stack In
connects to Stack Out.
Cabling problem Make sure all cable
connections are secure. Check
the cable for breaks or other
damage. Make sure the cable
length and specifications
comply with the requirements
in “Cable Types and
Distances” on page 1-4.
Replace suspect cables with
known good cables. Allow one
minute after each replacement
for problem to clear.
Hardware failure Isolate the faulty 8239 and
replace it.
Off On Off Fault detected in both Data In and Control In; both are
wrapped.
Cause Action
Stack cable connected to incorrect port
Make sure that Stack In
connects to Stack Out.
Cable problem Make sure all cable
connections are secure. Check
the cable for breaks or other
damage. Make sure the cable
length and specifications
comply with the requirements
in “Cable Types and
Distances” on page 1-4.
Replace suspect cables with
known good cables. Allow one
minute after each replacement
for problem to clear.
Hardware failure Isolate the faulty 8239 and
replace it.
Chapter 5. Problem Determination Procedures
5-9