This is a Nortel SR0000017E5 MM-10GE-2SFP Medium Module for the  4134 Secure Router.

SR0000017E5

10-port Gigabit Ethernet Module
• 10 x 10/100/1000 Mbps Unshielded Twisted Pair (UTP) ports/2 GigE SFP optical ports
• 10 active ports in any combination
• Non-blocking
• Layer 2/Layer 3 services

This was pulled right out of a Nortel 4134 router.

Tested working with a 90 Day Warranty

Let me know if you have any questions. M-F 9:00-5:00 PST