The ER XENPAK 10GBASE-ER transceivers are used by Ethernet service providers for inter-PoP connectivity. XENPAK is the only Multisource Agreement (MSA) that can support all Gigabit Ethernet standard interfaces and hence is the MSA of choice for Ethernet switch vendors. The ER XENPAK is the 10 Gigabit Ethernet XENPAK Transceiver, supports distances of up to 40 km on standard 1550 nm single-mode fiber (SMF), SC connector.
Full specifications (PDF)
Manufacturer part number: 10112