We have a Cisco 1801 which we have only just bought. It works well for a few minutes and the CD light comes on, then it decides that it has lost connection, and resynchs to the line. Sometimes this works and the connection comes back up, other times it sits there for a few minutes before it will reconnect. When it's reconnected, sometimes it stays connected for a few minutes other times it only connects for a few seconds.
When it does synchronize, it does at about 5mbps, when other modems only connect at 3.5mbps, so it seems like it's connecting too fast.
Other modems work fine.
Do I need to set the noise margin in the modem somewhere because I cannot find how to set this.
Any advice appreciated?