Farallon Communications 412, 612 manual Netopia Isdn Modem User’s Guide

7-6 Netopia ISDN Modem User’s Guide

■If the D channel LED goes out, the ISDN modem is ready to place and receive calls.

If you have a standard analog telephone attached to one of the ISDN modem’s analog device ports, you can place a voice call in the normal fashion. You should have the ability to obtain a dial tone, enter digits, and connect to your des- tination. While the voice call is being placed, either the B-1 or B-2 LED flashes yellow. Once the voice call is connected and the other party picks up the phone, the B-1 or B-2 LED that was flashing now remains lit until the call is discon- nected.

If you do not hear a dial tone or cannot establish a call on either telephone port, there is most likely a problem with the configuration of your ISDN line or one of your two

B channels. Call the telephone company and have it verify that you have been given the correct SPID and telephone number and that your line is configured for circuit-switched voice and data service.

6.Monitor the B-1 and B-2 LEDs.

Data calls typically involve more interactions than voice calls. Your computer, applications software, or the remote destination can prevent establishment of a data connection. If you are able to establish a two B channel data connection, your Netopia ISDN Modem is most likely functioning correctly.

■If you are unable to establish a data connection, carefully monitor the B-1 and B-2 LEDs while attempting a data connection. While establishing the data connection, the B-1 and B-2 LEDs flash green. They then remain green once the data connection is established.

■If neither of the B-1 or B-2 LEDs flashes green, check to make sure that your computer is turned on and operational, that your Netopia ISDN Modem cable is properly connected and not damaged, and that your application software has sent an AT dial command in the proper format.