One 10/100 Ethernet port supports system programming and management.
One 10/100 Ethernet port supports converged LAN communications.
Two 10/100 Ethernet ports support LAN connectivity or connect to optional expansion units that support additional lines or stations.
An input jack provides a second option for music on hold. The USB port supports enhanced capabilities for system management.
An RJ-21 connector on the front panel supports up to 4 analog trunks, 4 analog stations, 12 digital stations, music on hold, outbound paging and auxiliary relay output.