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4.3.1 Check the GREEN Light of the DECmux II
Problem
The GREEN light on the front of the DECmux II is not ON. (This
light indicates that the DECmux II unit has powered ON correctly
and has passed its self diagnostic tests. When the unit is powered
ON, the green LED will flash briefly and then remain OFF for sev-
eral seconds while self test diagnostics are run. It should come ON
permanently if all the self tests pass.)
Correction: Connect a terminal to the supervisor port and power up
the unit again. The start-up display listing the diagnostic tests by
numbers can be monitored.
NOTE
If
the terminal speed is not set to 9600 baud, this does not indicate
a fault - the start-up message will be garbled. If the green LED
does not stay on permanently, the DECmux II is faulty. Return it
for repair (refer to Section 4.7, DIGITAL SERVICE).
4.3.2 Green LED on Steady, DSR Light Off (RS-232 Lines
ONLY) (This Applies to Both the MUXserver 100 and the
DECmux II)
Problem
The Red DSR LED on the back of the MUXserver 100 or the
DECmux II are OFF.
Correction: The two red LED indicators on the rear connector panel
indicate the status of the composite port DATA SET READY con-
ductors. The ON state indicates successful connection to a modem
on the respective composite port. The OFF state indicates that the
modem is either in the process of connecting or not connected.
If
the DSR LED is OFF when there is an RS-232 composite link
connection to that port, check the cable connections.
Communications cannot occur with this DSR light OFF.
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CHAPTER 4 MUXserver 100 TROUBLESHOOTING
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