Cisco offers a variety of connectivity, expansion and upgrade modules and cards to accommodate the customer specific needs. These components are easily and inexpensively upgradeable as customer requirements change.??This is 8-port multichannel E1 port adapter with G.703 120ohm interface.

The Cisco Catalyst 3550 Series Intelligent Ethernet Switches are a new line of enterprise-class, stackable, multilayer solutions that provide high availability, scalability, security and control to enhance the operation of the network.