The NFS-320 has no built-in DACT — what communicator options are available and what constraint does the single internal option board slot create?

The NFS-320 supports several communicator options, including the UDACT (dual phone line), 411/411UDAC series, IPDACT-2/2UD (Internet), and IPGSM-4G or HWF2V/A-COM (Cellular/IP) [1].

Because the cabinet only accommodates one or two internal option boards, the primary constraint is that any additional modules must be installed in remote cabinets (Page 4) [1].

For internet communicators like the IPDACT, an IPCHSKIT is required for chassis mounting, or an IPENC for external mounting [1].