14
SYNC/ASYNC FIBER OPTIC MODEM
2. Introduction
2.1 Overview
2.1.1 G
ENERAL
The Sync/Async Fiber Optic Modem provides a secure, long-range data link
between computers, routers, multiplexors, and other data communication (DTE)
devices at output power ranges from 12 to 18 dB.
The Modem operates in either half- or full-duplex mode over sixteen selectable
synchronous/asynchronous data rates ranging from 19.2 kbps to 256 kbps,
enabling transmission up to 43.5 miles (70 km).
The Modem uses an infrared light-emitting diode to convert electrical signals
into optical signals. The optical signal is converted back into an electrical signal in
compliance with the appropriate interface on the receive end.
Transmit clock timing is provided either internally, derived externally from the
DTE, or recovered from the receive signal.
The Fiber Optic Modem features V.54 diagnostic capabilities for performing
local analog and local and remote digital loopbacks.
2.1.2 A
PPLICATIONS
You can use the Fiber Optic Modem in a point-to-point application (see
Figure
2-1
): Two Fiber Optic Modems are connected by a single-mode fiber (up to
43.5 miles [70 km]). Each unit is connected to a workstation or an AS/400
®
system.
Figure 2-1. Point-to-Point Application.
Fiber Optic
Modem
Fiber Optic
Modem
