Cisco - SFP (mini-GBIC) transceiver module

1GbE - 1000Base-BX80-D - LC/PC single-mode - up to 80 km - 1560-1580 (TX) / 1470-1510 (RX) nm - for P/N: N540X-6Z18G-M-A, N540X-6Z18G-M-D, N540X-6Z18G-SYS-A, N540X-8Z16G-M-A, N540X-8Z16G-M-D