I have quite a bit of confusion with G703 as it is not really well documented and it is not really widely used in my region.
Basically, my telco will be providing data via that interface with a RJ45 - 120 Ohm. Which WIC cards is compatible (which is the cheaper alternative) and more importantly, where can I get a RJ45 - 120 Ohm cable? I'd presumed that a straight through cable is required.
The VWIC is OK, you generally do no need the G703 version. On the 1841 you can also use HWIC-1T1/E1. You can make the cable with using cat 3 or similar.
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