3com Router 1-Port Fractional E1 SIC 2Mbit/s networking card

Router 1-Port Fractional E1 SIC Maximize Performance with Optional Interface Cards
These Smart Interface Cards (SICs) provide a variety of expansion options that let you enhance the 3Com Router 5012 and Router 5009 performance to optimize network operation. Customize your network to your business needs.
Provides full or fractional E1 capabilities
Facilitates scalable and secure network operation
Maximizes interface density and slot efficiency
For use with 3Com Router 5012 or Router 5009