3com Router 4-Port ISDN S/T MIM networking card

Router 4-Port ISDN S/T MIM - For use in 3Com Router 5232 and Router 5231, Router 5642 and Router 5640, Router 5682 and Router 5680 Maximize Performance with Optional Interface Modules
These Multi-function Interface Modules (MIMs) provide a variety of expansion options that let you enhance router performance to optimize network operation. Customize your network to your business needs. - Provides ISDN BRI S/T capabilities
- Facilitates scalable and secure network operation
- Maximizes interface density and slot efficiency
- For use in 3Com Router 5232 and Router 5231, Router 5642 and Router 5640, Router 5682 and Router 5680