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RAD Data Communications 2006 Catalog
MINIATURE FIBER OPTIC MODEMS
FOM-9
Sync/Async High Speed Fiber Optic Modem
The FOM-9 is a miniature sync/async fiber
optic modem operating full or half duplex
over fiber optic cable. It has a range of
15 km (9 miles) over single mode fiber and
operates at selectable data rates up to
128 kbps.
The FOM-9 includes a built-in BER tester
that generates a 511-bit pattern and can be
used for testing the link integrity. Diagnostic
loopbacks according to ITU V.54 can be
activated for fault isolation. Two types of
diagnostic loops are supported: local analog
loop and remote digital loop. The loopback
options and the BER tester can be activated
by toggling pin 18 or 21 on the V.24/RS-232
interface.
When set to asynchronous mode, the
modem internally converts the transmission
to synchronous format, in compliance with
the ITU V.14 standard.
The FOM-9 includes innovative circuits that
allow operation without external power, by
drawing low power from the DTE data and
control signals. In cases where the DTE
cannot provide enough power, the FOM-9
includes a special jack that can be connected
to an external AC power supply adapter.
The modem has six LED indicators to display
the status of the modem: TD, RD, DCD, RTS,
TEST, and ERR.
FOM-9 FOM-9
128 kbps 128 kbps
Fiber optic
cable
15 km
(9 miles)
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• Selectable sync or async operation
• Selectable data rates from 9.6 kbps to
128 kbps
• Range up to 15 km (9 miles) over single
mode fiber
• Built-in BER tester and V.54 diagnostic loop
support
• Carrier control mode for end-to-end signaling
• LED indicators for status display
FOM-8H
High Speed Fiber Optic Modem
The FOM-8H is a high speed fiber optic
modem operating full or half duplex over fiber
optic cable. It has a range of 4 km (2.5 miles)
at data rates up to 56 kbps or 64 kbps.
The FOM-8H has diagnostic capabilities
complying with the ITU V.54 standard. Two
loops are available: local analog loop and
remote digital loop. These are activated by
a manual switch or by toggling the
corresponding pins of the DTE interface (not
applicable with X.21 interface).
Transmit timing is provided by one of three
alternative sources:
• internal oscillator
• loopback clock derived from the receive
signal
• external clock from the terminal
The carrier can be strapped for either
continuous or switched operation,
controlled by the RTS signal.
Several interface options are available:
RS-232/V.24, RS-530, X.21, or V.35. The
modem has LED indicators for TD, DCD,
TEST, and POWER. The FOM-8H is packaged
in a lightweight plastic case.
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• Sync or async transmission at 56 kbps or
64 kbps
• V.54 diagnostics
• Range up to 4 km (2.5 miles) over
multimode fiber
• Controlled or continuous carrier
• V.24/RS-232, V.35, RS-530, or X.21 interface
FOM-8H FOM-8H
IBM 37X5
56 or64 kbps
Fiber optic cable
IBM 3174
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