Cisco DWDM-XENPAK 10GBASE-ZR/ZW Ethernet transceiver is rated for distances up to 80km with a maximum bandwidth of 10Gbps. The DWDM-XENPAK operates at a wavelength of 100GHz (C-Band). The DWDM-XENPAK is 100% compatible with all Cisco series switches and modules which support XENPAK transceivers.