Is it possible to attach the multi-key telephone set that uses four wires to a phone key switch via the Cisco 575 LRE CPE and the 2900 LRE XL switch?
A. The Cisco 575 LRE CPE will pass phone and data signaling via the center pair (pair1) of wires 3 and 4. The second outer pair (pair 2) will pass through the CPE unaffected as long as the second pair is connected via the 25-pair cable going to the POTS splitter. You don’t need to run the second pair of wires through the POTS splitter; there will not be LRE data on the second pair.
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