Network Control Module 300 Series Technical Bulletin 61
3. Cycle power to the NCM. An LED 4 error indicates that a port is
failing. Use WNCSETUP menu INFORMATION command to
find out which port is failing.
Additional Field Checks: S2 Migration Connections
1. Check that the TableTop Modem LEDs are blinking (not steady
On or steady Off) before investigating problems with the RS-232
port.
2. Check that the S2 software was downloaded (WNCSETUP menu
NOVRAM command).
For problems that occur with the S2 Migration network, refer to:
• S2 hardware: Using Diagnostics chapter (LIT-120159) of the
Operator Workstation User’s Manual
• S2 software:
- Using Diagnostics chapter (LIT-120159) of the Operator
Workstation User’s Manual
- Diagnostics Feature, S2 Statistics
Additional Field Checks: JC/85 Gateway Connections
1. Because the JC/85 polls the Gateway NCM, the RECV LED
should light before the XMIT. If the XMIT LED lights first,
ensure that the cable between the JC/85 and RS-232 port is not
backwards.
2. Check that the JC/85 software was downloaded (WNCSETUP
menu NOVRAM command).
For problems that occur with the JC/85 Gateway network, refer to:
• JC/85 hardware: JC/85 Gateway Application Note (LIT-6363147)
• JC/85 software: JC/85 Gateway Application Note (LIT-6363147)
Additional Field Checks: RS-232 Remote Modem
Applications
• (For 2400 baud modems, and above) Ensure that the NOVRAM
parameters are correctly loaded.
• (For Multi Tech® modem) Ensure that the remote modem switch
settings are correct. Refer to switch settings in the Leased Line
Modem Application Note (LIT-6363141).
Network Terminal
Upon power up, the NCM’s diagnostic LEDs indicate internal errors.
An LED 4 error indicates that a port is not functioning. Use
WNCSETUP Information command to find out which port is failing.
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