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CHAPTER 2: Introduction
MultiMode FOMs are fiberoptic short-range modems with a special money-
saving edge. Many other fiberoptic modems can’t transmit and receive data
through the same port, so they use cables with two fibers. MultiMode FOMs
communicate with each other over a much less expensive
single-fiber
cable,
across distances of as much as 5 km (3.1 miles).
2.1 Features
• Synchronous or asynchronous operation
• Communicates point-to-point over a single optical fiber
• Local and remote test modes
• Asynchronous data rates up to 38.4 Kbps
• Synchronous data rates up to 256 Kbps
• Distances up to 2.5 kilometers (1.5 miles) at any speed
• Distances up to 5 kilometers (3.1 miles) at speeds of 64 Kbps or less
• Internal or external clocking
• Support for transparent hardware, or local hardware, or local software
flow control
• Available with ST
®
or SMA connectors
• Tri-state front-panel LED indicators
2. Introduction
