RAD Data comm 146 FOM-8, FOM-6MP

•	Selectable sync or async operation
•	V.54 diagnostics
•	Selectable data rates up to 19.2 kbps
• Two versions: single mode and multimode
•	Range up to 15 km (9 miles) over single
	mode fiber
•	Carrier-controlled for transfer of control signal
•	No external power required

M I N I A T U R E F I B E R O P T I C M O D E M S		12
FOM-8		I M
Sync/Async Fiber Optic Modem		N
		E R U T A I
	Fiber optic cable	E B I F
		R
FOM-8	FOM-8	C I T P O
The FOM-8 has diagnostic capabilities	standard. Different async formats are
complying with the ITU V.54 standard.	switch-selectable.

• Metal case

• Card version

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The FOM-8 is a 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 19.2 kbps.

Two loops are available: local analog loop and remote digital loop. These are activated by toggling pin 18 or 21 of the V.24/RS-232 interface.

In synchronous transmission, the transmit timing can be selected for internal, external or loopback clock. Asynchronous transmission is converted internally to sync format in compliance with the V.14

Innovative circuitry design allows operation without external power, by drawing low power from the DTE data and control signals. The FOM-8 is packaged in a metal case for reduction of EMI/RFI emissions.

The modem is available as a card for mounting in a 19" rack (see CMN-16 nest, card CMN-CF8).

S M E D O M

FOM-6MP

Async Fiber Optic Multipoint Modem

•	Asynchronous transmission up to 38.4 kbps
•	Multidrop operation over a fiber link
•	Transmission range up to 46 km (28 miles)
	over single mode fiber
•	RTS or data contention for multipoint
	operation
•	Automatic disabling in the event of streaming

RS-232 Fiber optic

FOM-6MP/SL

Host

FOM-6MP/DL FOM-6MP/DL FOM-6MP/DL

Remote terminal units

• Variety of optical options, including:

multimode, single mode and laser diode

for extended range

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The FOM-6MP async fiber optic modem operates over fiber to connect remote terminals and computers, connected in multidrop, to a central host. Transmission range (regardless of the data rate):

• 3.5 km (2 miles) using 850 nm multimode fiber

•30 km (18 miles) using 1310 nm single mode fiber

•46 km (28 miles) using 1310 nm laser diode single mode fiber

The FOM-6MP contains two optical interfaces and one V.24/RS-232 port. One optical interface passes data to and from the host while the other passes data to and from the rest of the terminals in the chain. The V.24/RS-232 interface is connected to the local terminal.

Terminal contention for transmission to the

host is selectable: transmitting data or raising RTS signal.

The FOM-6MP includes anti-streaming protection which prevents blockage of data transmission. The FOM-6MP disables a port that blocks the polling for a preset, user- selectable period of time.

LED indicators help the user to easily isolate faulty segments along the chain of terminals.

The FOM-6MP requires an external DC power supply of 10–30 VDC/500 mA.

RAD Data Communications 2006 Catalog 153