we are using Yoda, for connecting PBX. The voice is fine. Fax and data modems also work over this E1. But on one link we are facing problems with data modems. The modems don't connect but the moment we switch the E1 on a regular lease line copper E1 they work perfect.
Why is it so? any suggestions? can it be due to errors on the rf link which are ok for voice but bad for sensitive data?