Hey,
In SMP (Fine in SSP) You can't link a Remote Monitor Server & Client. When placing the Blank card into the Server (Which might have an id of say @270) it changes to an ID card, when placing it in the client however it says the ID it has picked up is in the negatives (Lets say @-1435434543) and the Client will not send out redstone signals for any channels.
This is an SMP Bug only, we have tested this on a Tekkit Server 3.1.1 (Bukkit Obviously) with both rev 5 & 6 tried on the Server & Client.
Is this an issue on our side? Pics can be made if needed. Would really like to know what is wrong since this is a major reason why we are using the mod.