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MULTIMODE FOMS -ST AND -SMA
2.2 Description
The MultiMode FOM is a fiberoptic short-range modem for point-to-point
RS-232 communication over a single 62.5-µm fiber, such as one of those
bundled into our bulk multifiber cables EFN1004 and EFN1006. The FOM
supports synchronous data rates up to 256 Kbps, and asynchronous data rates
up to 38.4 Kbps. It can also support transparent hardware flow control or
local flow control; in the local setting, it automatically adapts to either
hardware or software flow control. Synchronous timing can be set for
internal or external (from attached RS-232 device) clock.
The MultiMode FOM features extended-data-rate circuitry that allows for
single-fiber distances between 1.5 and 3.1 miles (2.5 and 5 km). Depending
on which model you have, you can connect optical cable with ST or SMA
connectors to the FOM. The MultiMode FOM encodes your data signals
using 3B4B modulation, then converts them to an 880-nm optical signal.
The MultiMode FOM features two test modes: local and remote loopback.
You can activate either of these tests with the FOM’s front-panel toggle switch.
The local loopback test is used to evaluate the DTE-to-modem connection.
The remote loopback test is used to evaluate the condition of the connection
between the modems.
