3com Router 1-Port ISDN-U SIC- MSR wired router

Router 1-Port ISDN-U SIC- MSR Maximize Performance with Optional Interface Modules
These Smart Interface Cards (SICs) provide a variety of expansion options that let you enhance router performance to optimize network operation and customize your network to your business needs.
Provides ISDN BRI U capabilities. Facilitates scalable and secure network operation. Maximizes interface density and slot efficiency. Support for two types of operating mode: dialing and leased line. Smart Interface Cards (SICs) enable scalable and secure network operation. SICs maximize interface density and slot efficiency. SICs support dialing and leased-line operating modes.