Cisco Systems, Inc. is the worldwide leader in networking for the Internet. Cisco products include routers, LAN and ATM switches, dial-up access servers and network management software. These products, integrated by the Cisco IOS software, link geographically dispersed LANs, WANs and IBM networks. Cisco offers a variety of expanding modules for Cisco routers to upgrade its abilities in order to meet growing demands of modern networking communications. The astonishing versatility of the Cisco router series is highlighted by its broad support of Integrated Services Digital Network Primary Rate Interface (ISDN PRI) connectivity.The network modules provide various port densities to meet customer requirements at various price points. The many LAN connectivity modules for the Cisco 3600 platform are designed to accommodate a range of application needs in customer networks. The LAN network module family assures customers that they can choose a LAN connectivity solution that fits their requirements. Available as network modules, LAN connectivity options offer several port densities, media options, and speeds. As modular components, they are easily and inexpensively field-upgradable as customer requirements change.NEW enhanced PRI Network Modules offer a single integrated 10/100BaseTX port and one port T1 PRI interfaces. The new network modules differ from the original PRI network modules in that they now include a 10/100 Ethernet port. The T1 PRI/Channelized versions are available with CSU. That's why they connect directly to the network via an RJ-45 cable.This One-port 10/100BaseTX and one-port PRI/Channelized T1 with CSU module version supports speeds up to 1.544Mbps full-duplex and provide up to 24 virtual interfaces in channelized mode, and up to 23 ISDN B-channels in the PRI mode.