In the new building, we had problems with a Frama franking machine which wouldn't connect to the network:
- When the machine boots up, the ethernet link goes up and the device DHCPs to get an address but then disconnects.
- When trying a connection test or trying to frank something, the link never goes live (the interface doesn't go up from a physical/line level - not getting as far as IP) and it reports an error.
- The machine does, by design, disconnect from the network when it's not using it as a security measure (to minimise the chance of being hacked remotely).
- The connection is via a wall socket and probably 30-40m cable.
- The franking machine only has a 10Mbit/s half-duplex ethernet interface.
- The switch the machine was connecting to is a Cisco 2960X-48LPS-L (48-port PoE+ with 10G uplink).
I ended up solving it by putting an unmanaged Netgear 8-port 10/100 switch between it and the wallport and it works fine.
However, I also wondered if PoE was upsetting the controller in the franking machine so I disabled that and removed the Netgear. That was working when I left, so that may have fixed up, but I'll have to check in and see how they're getting on, a couple of days later.