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CHAPTER 2: Introduction
2. Introduction
2.1 Description
The Async/Sync Fiber Optic Modem is a miniature modem that combines the
inviolability of fiber with the troubleshooting capabilities of V.52 and V.54
diagnostics. The modem operates in asynchronous or synchronous mode, supports
data rates to 57.6 kbps, and plugs directly into a workstation’s RS-232 port. The
modem is also available in a card version (ME570C-R2).
Like all fiberoptic modems, the Async/Sync Fiber Optic Modem is inherently
immune to RFI/EMI noise, ground loops, and transient surges. The carrier may be
switch-selected as either “Continuously On” or “Controlled by RTS.” Two easy-to-
read LED indicators monitor the Error and Test modes. Drawing all necessary
power from the RS-232 interface, the modem requires no AC power or batteries to
operate.
The miniature modem fits into tight installation spaces. On the RS-232 side, the
modem is equipped with either a male or female DB25 connector. On the fiber
side, the modem has either SMA or ST
®
connectors. It supports distances of up to
3.5 miles (5.6 km).
2.2 Features
• Supports async or sync communication over dual optical fibers
• V.52 and V.54 diagnostics
• Data rates to 57.6 kbps
• Distance to 3.5 miles (5.6 km) over continuous fiber
• Immune to RFI/EMI noise, ground loops, and transient surges
• Easily accessible diagnostic and configuration switches on standalone model
• Jumper-selectable carrier control
• Requires no AC power or batteries
• Two easy-to-read status indicators
• Male or female DB25 and SMA or ST connectors available
