As far as I know, You will only need to have one Sig Server on the network, connected to one Meridian system.
Acording to one of my colleagues, All that you will need at other Meridian Nodes, will be a Pentium / Media (SA) Line card at the latest release for Succession. You will need a "T" & "E" LAN I P Address. It's configured as some sort of remote node?. I'll try & get some more info on it.
We have now got it working to another Succession via the Gatekeeper & I'm pretty impressed with the Element browser. You can do a fair bit of programming with it.
We have been using a upgraded Pentium 24 port line card, which is fine.