I am looking to uplink a Cisco sg200-50 to a sg200-26 via the mini-GBIC port with a optical transceiver or a distance of about 30 meters. The part for the transceiver for the 1000 Base is the MGBBX1. But what I am confused on is the Cisco Mini-GBIC SFP Transceiver Quick Start Guide says "For the Cisco MGBBX1, use the Cisco GLC-BX-D as the
downstream SFP." I am not sure what that means do I need two different modules? I just want to add another switch in the back of the building and connect the two via fiber. Can someone who knows what they are doing please give me some guidance. I called Cisco pre sales and they are trying to pawn me off the a partner to try and sell me on having them do the installation.