Cisco Rugged SFP - SFP (mini-GBIC) transceiver module - GigE - 1000Base-LX/ 1000Base-LH - LC/PC - up to 6.2 miles - 1310 nm - for P/N: 4GE-SFP-LC-RF=/ GRWIC-D-ES-2S-8PC/ GRWIC-D-ES-2S-8PC=/ GRWIC-D-ES-6S