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The FOI-4451 and FOI-4541 both provide complete electrical isolation for RS-422
communications. The units are compatible with RS-530, MIL-STD-188-114A balanced type 1 and type 2, and FED STD 1030A. The units are transparent to all handshaking protocols and can accept
data and clock signals up to a maximum rate of 6.144 Mbps. A regeneration switch
on the FOI-4451 allows users to toggle between synchronous applications that require
Send Timing (ST) and asynchronous or synchronous applications that require Terminal
Timing (TT). |
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The FOI-2971, FOI-2972, and FOI-4972 all provide complete electrical isolation for
2-wire telephone communications. The FOI-2972 is a low cost solution
for customers using standard analog phones, STU-III phones, fax
machines, and modems. The FOI-4972 is an upgraded model of the FOI-2972
with all the same capabilities except that it can pass caller ID and operate with STE phones. A typical link consists of an FOI-2971 connected to the POTS line and an
FOI-2972 or FOI-4972 at the subscriber’s phone with a duplex fiber optic cable between them. |
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The FOM-3901 and FOM-3902 both provide complete electrical isolation for Nortel’s
Meridian™ M2000 and M3000 series digital telephones. The FOM- 3901 connects to the
digital line card and automatically senses and corrects any improper polarity reversals
on the RJ-11. The bidirectional signaling between
the digital line card and telephone is then carried across a duplex fiber optic
cable. The FOM-3902 reproduces the digital signaling at the isolated end of
the fiber optic link and provides power sufficient to operate M2000 and M3000
series digital telephones. The FOM-3902 also provides +42VDC power to
auxiliary relays in the M2016S telephone. |
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 | | The FOM-4PSW is a 4-port 10/100 BASE-T unmanaged Ethernet Switch. The card has four RJ-45
ports and one fiber optic port. The card provides complete electrical isolation for both 10BASE-T and 100BASE-TX Ethernet communications. The RJ-45’s incorporate an automatic MDI/MDIX feature, which allow users to use either a straight or crossover cable for all LAN configurations. In addition, multimode optics on the card can extend
the transmission distance to 2km, while singlemode optics can further extend the distance to
20km.
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