Black Box Universal Sync/Async Short-Haul Modem - short-haul modem - RS-232

The Universal Sync/Async Short-Haul Modem gives you the flexibility to use it in almost any UTP or STP application. It's non-powered to you can use it almost anywhere without worrying about power. It provides high data rates and distances. In synchronous mode, the SHM supports internal, external, or receive loopback clocking.