Dropped Internet Connection - Busy Switch?

Have you ever had problems with dropped Internet connections when the router is connected to a busy network switch? I have seen this several times, and still don't have a definitive answer. The scenario is that cameras are on the same network as the client computers, all running through the same network switch. The modem works fine for a day or two, then drops the Internet connection.

I have several possible explanations:

  • The network switch is too heavily loaded and the DSL or Cable Modem/Router is disconnecting due to time-outs.
  • Grounding issues between the router, the switch, and/or earth ground.
  • The switch and the modem are failing to 'Auto-negotiate' the interface speed.

What worked in one specific case was to put a cheap Netgear 5 port switch between the PoE switch and the cable modem. At another site, I ran the modem LAN interface straight into a second NIC card. There are 3 more ports on the back of the modem for other workstations that need Internet access. Also Gigabit Ethernet seems to work better than 100 mbit, so perhaps it is a speed issue.

What do you think?

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