This is my problem... and I really cant make it work.
I have two buildings in my office that are connected by fibre, multimode 50/125 micron. At present we have Cisco 2950 with SX port (1000 Base SX). The new switches I want to introduce are 2960 (WS-2960 24-TCL with GLC-SX-MM as SFP modules). When I tried to connect these to the fibre, 2950 at one end, and 2960 at the other, the link doesn't go up no matter what. What could be wrong. The link works fine once I have 2950 at both ends. The patch cord with 2950 is MT-RJ/ST and with 2960 is ST/LC reference to the figure .http://www.specialized.net/ecommerce/shop/images/682X221_PLI.JPG for ST/LC patch cord.