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

Page: 66 / 141

Table 5-9 (Page 4 of 4). Stack-Out Status
Green
(Data Out) Yellow
(DO/CO
Status) Green
(Control
Out) Meaning
Blinking On Off No fault on Data Out but Data Out has been wrapped by
system administrator. Fault detected in Control Out and
Control Out is 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.
LCD and LED Codes
The Model 1 LCD and the Model 2 LED display two types of messages:
¹
POST codes
¹
Operational codes
POST Codes
POST codes are the same on both the Model 1 LCD and the Model 2 LED display.
At the beginning of POST, the green and yellow box status LEDs start blinking
simultaneously. They blink until POST is completed.
Table 5-10 on page 5-15 shows the letters displayed at each stage of POST and
the action that should be taken if the POST stops at that stage and displays one of
the letters.
5-14
8239 Setup and User’s Guide