LG GLOFA-GM Series User Manual page 65

Chapter 4 Performance specification
LED type If normal
ERROR
MODEM
2) LED display & Troubleshooting for dial-up modem : Since LED specification for dial-up modem differs according
to makers, user's manual for modem shall be referred to. [Table4.7] describes how to troubleshoot in dial-up
modem based on common specification of LED display.
[Table4.9] Checklist for dial-up module's LED
LED type If normal
TXD
RXD
Flash if in
RTS
transmission
Flash if in
CTS
transmission
ON always
DTR
ON always
DSR
ON after
CD
telephoned
If abnormal
OFF Flash
ON OFF
If abnormal
Flash
OFF
Flash
OFF
OFF
OFF
OFF
OFF
OFF
1) Check cable connection
2) Check if modem is deficient
1) Download communication type of RS-232C channel as set to
modem via Frame Editor
2) Check if channel operation mode is set to stand-alone mode
1) If module's TX LED doesn't flash, follow LED Checklist to
troubleshoot
2) If module's TX LED flashes, check cable connection between
Cnet and modem
1) Check if phone line is connected to line terminal
2) Check if data is transmitted from the other station's modem
3) Check public line
1) If TXD LED doesn't flash either, follow the action for TXD
LED to troubleshoot
2) Check cable connection between module and modem
1) Check if RTS LED flashes (CTS will flash only if RTS
flashes)
2) Shoot the trouble of RTS LED to let RTS flash
3) Check cable connection between module and modem
1) Check if module is set to modem mode
2) Check cable connection between module and modem
1) Check if module is set to modem mode
2) Check cable connection between module and modem
1) Check status of public line
2) Check connection status of phone line to line terminal
4-33
Action to take
Action to take