TPT-DC4 (TruePath Dry Contact 4 Port) unit is a stand-alone hardware appliance that SNMP polls devices over Ethernet via SNMP/TRAP and can trigger/flip one or more dry contacts. This solution works very well in situations where a telco (ADX modular DAS) or other piece of equipment needs to trigger a dry contact (fire panel) but doesn't have the means to. The TPT-DC4 unit can connect directly using a cross over ethernet cable or through a standard network to talk with the equipment. The TPT-DC4 unit polls via SNMP, it looks for values and then can flip/trigger 1 or more dry contact points on say fire panel or other points.
(These are the matching TPT-DC2 pictures and spec sheet for reference)