Telebyte Model 274 - modem (analog)

The Model 274 is a unique fiber optic short haul modem since it only requires one multimode, 62.5/125 fiber, thereby saving a second fiber optic line, which is commonly used by conventional fiber optic modems. Where standard duplex fiber cables have been installed the system capacity can now be doubled without the expense of installing new fiber. The Model 274 supports nine synchronous data rates up to 256 Kbps or any asynchronous data rate from DC to 38.4 Kbps. It also supports two low-frequency RS-232 handshake signals RTS/CTS and DTR/DSR. Built-in diagnostics, operator selectable, include Local Loopback and Remote Loopback. The user interface is via a female DB-25 connector while the optical fiber interface uses an industry-standard ST connector. LEDs for TD, RD, control signals and loopbacks aid in verifying system operation.