Hi, I want to interconnect ws-c2960-24TC-L +2SFP with 1000Base-LH GLC-LH-SMD or GLC-LH-SM to ws-c3750G-12S +12SFP ports .which model of GLC-LH-SMD or GLC-LH-SM want to select ?I am going to use fiber cable single mode 1310nm 9/125. Do I need Single ...