Can I connect your 1GbE part (e.g. DP83867CR) directly to your 10/100 part (e.g. TLK10xL) via RJ45 connectors and associated CAT5 cabling? I need to know if they can be wired up together such that they are completely compatible. I know some 10/100 parts can be compatible with 1GbE parts and then the XCVRs negotiate allowable rates, but I'm not sure that all 10/100 parts, when directly connected to 1GbE, can work this way. How do the 2 differential pairs of TLK10xL wire up to the 4 differential pairs of the DP part?. I they can be directly connected, via magnetics, RJ45, and associated cabling, does DP part just detect that TLK part communicates differently over only two of its four differential bidirectional lines?