A High-speed Serial Interface (HSSI) network processor module (NPM) is a high-speed and high-bandwidth serial interface device that is inserted into one of the three chassis slots on the modular Cisco 4500 or Cisco 4700 routers.The single-port HSSI NPM supports speeds up to 52-Mbps full duplex. This dramatically raises serial performance from the 8 Mbps provided by the aggregate of 4 ports on the NP-4T NPM serial module. This represents a more than six fold increase in performance per module over previous serial connections. There are many network applications for the HSSI network processor module. For example, network administrators can significantly increase system port density and deliver high quality of service for bandwidth-intensive applications such as video and multimedia services. Medium-sized Internet service providers and telcos can also use this module to connect to an Internet backbone provider via a T3 or E3 line. The HSSI network processor module can also be used for campus to campus high-speed serial connections.