I have a vwic-1mft-E1 in an 1841. I normally use a CAB-E1-RJ45BNC, to convert the unbalanced 75 ohm BNC from the Telco NTU into RJ45 for the vwic, but my customer has said the router rack is many meters from the NTU so I need to use a BNC 75 ohm unbalanced to RJ45 balanced cable (they extend the RJ45 to the rack using internal RJ45 patches, and balanced works for much greater distances than unbalanced)
My questions are:
1. What commands do I use to re-configure the 1841 so that the vwic accepts balanced RJ45, and not unbalanced?
2. Is there a Cisco cable that I can use to convert BNC 75 ohm unbalanced NTU to RJ45 balanced? I looked at the CAB-E1-RJ45TWIN, but it doesn't seem compatible with the NTU (i.e. NTU is 75 ohm BNC unbalanced, and this cable is 120 ohm balanced, and I don't think a twinax cable is physically the right size to connect to the NTU's BNC port).
You can use the CAB-E1-RJ45BNC for the 75 ohms unbalanced connection. For 120 ohms balanced, You might need to check the pin connections of your devices and make the cable. You could be lucky that a straight cable will work. The following link shows the pins layout for the card
A colleague has told me to use the mt242a-m from black box (link below). The spec seems similar to the CAB-E1-RJ45 from Cisco, but from practical experience the Cisco cable does not handle extending over UTP patch panels between racks, whereas the Black box one does, so there must be a subtle difference in the specifications of each. Thanks to all of you for your help.
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