Let me give you the setup:
1. First D-Link router is in office #1. It receives internet connectivity via land line ADSL. There are 2 notebooks and 2 mobile phones in that office and, that get internet wirelessly from that router. I have a CAT5 cable that runs from office #1 to my second D-Link router (same model) in office #2.
2. In Office #2 the router connects to my PC via CAT5, and we have multiple wireless devices connected in Office #2.