[GreenKeys] Modem with 20mA current loop interface

[Suhayl Khan]

I found the following modem for sale on eBay. It may be of interest to some
as it appears to have the 20mA current loop interface as part of the unit
itself. Click here: link
<http://www.ebay.com/itm/171577752729?_trksid=p2060778.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT>
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