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Westermo short haul modems are used on 4- or 2-wire private lines. The products in this group require a 4-wire line for full- or half-duplex communication. Another name for this type of device is line driver.
Point to point
RS-232/V.24 for point to point connections
over 4-wire.
Line sharing devices
RS-232/V.24 and RS-422/485 in multipoint
or star connections over 4-wire.
Multiplexers
RS-232/V.24 for 4 up to 16 ports over 2-, 4-wire.
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