CTI Products NCB/EM with External PSTN Modem - Manual (Page 49)

CTI Products, Inc. NCB-EM User Guide
Appendix E. Troubleshooting 43
Table E3
If the OH LED . . . REASON CORRECTIVE ACTION
Is not illuminated when using
a Leased-Line.
Normal operation. Go to next Table
Illuminates immediately when
a connection is attempted
in Dial-up mode.
Normal operation indicating the modem is in
the ‘Off-Hook’ condition.
Go to next Table.
Does not illuminate on
originating NCB when
using a Dial-Up line and a
connection is attempted.
1. DIAL command is not being sent
correctly to originating NCB.
2. Defective modem.
1. Verify that the originating NCB is
receiving a proper DIAL command.
2. If “OH” LED does not illuminate, call
CTI Products, Customer Support (+1-
513-595-5900), to arrange to return
unit for evaluation/repair.
Illuminates only briefly (less
than 5 seconds) on
originating NCB when
using a Dial-Up line and a
connection is required.
Dial-up line is not operating to the telco
switching equipment. (While initiating a
dial-up connection, and with a handset
connected to the AUDIO connector of
the originating NCB, the dial tone can
not be heard.)
Contact dial-up line provider for line status.