Cisco XENPAK-10GB-ER 1550nm 40km DOM SC SMF Transceiver - FROM WS-X6704-10GE
PULLED FROM WS-X6704-10GE MODULE. Cisco Catalyst 6500 Series Virtual Switching Supervisor Engine 720 with 10GE uplinks or Supervisor Engine 720 with any policy feature card (PFC; chassis will work in lowest common denominator mode).