We have an 1805 router that terminates business class cable 2 Mbs up and down. The circuit is provisioned by the leading cable provider in our area, but is resold by a SIP service provider. We use the connection to carry both voice and data. We have no voice quality issues.
Over the last several months, the 1805 will crash intermittently. Sometimes it will go for days or even a couple of weeks without crashing. Other times it will crash a couple of times in a day. Since it is not "our" equipment, we don have access to it. That being said, our service provider has had a couple of different theories. The latest one is that we are exceeding the DOCSIS Packet Per Second (pps) limitation, which in turn is causing the router to lock up. They are suggesting that our only alternative is to upgrade to a fiber based MetroE link.
Prior to having the cable solution we had a data T1 that carried both voice and data, all with no issues.
Does their theory hold water? I asked them if other clients experienced this and they said no. Their explanation that exceeding PPS on the cable interface just doesn sit right with me. If anything, it should just discard packets. What am I missing? I find it hard to believe that an 1805 is not able to deal with what is, purportedly, PPS oversubscription.
Any feedback would be greatly appreciated. As mentioned, we don have access to the device and we don even have direct access to the carriers support so it will be difficult to provide any debugs. I am just skeptical that we should reflexively accept the answer that says "PPS limitation. You must upgrade."