The AS5200 family is designed to maximize customers' investment protection by terminating both analog modem and ISDN calls on the same chassis from the same bearer line. The AS5200 establishes the entry and midrange of the access server family. Modem ISDN Channel Aggregation (MICA) technology results in investment protection through modem modules that can be transferred to higher-density AS5200 servers as capacity needs increase. Frequently, geographic concerns require a service provider to employ a large number of small points of presence (POPs) that are geographically dispersed. The AS5200, with its compact, cost-effective, medium-density two-Primary Rate Interface (PRI) design is optimal for implementing such a dispersed dial infrastructure. Its redundant, high-speed serial ports provide for backhaul of data to points of aggregation. In higher-density implementations, the AS5200 functions as a component of the Cisco Dial Access Stacking architecture (DASA), scaling to provide an access point to thousands of ports. Through the use of Multichassis Multilink Point-to-Point Protocol (MMP) enabled by Layer 2 Forwarding Technology (L2F), Layer 2 Tunneling Protocol (L2TP) and Cisco developed Stack Group Bidding Protocol (SGBP), Cisco's high-density access solutions can grow to meet the requirements of the frequently changing dial environments. Since the initial building block is a relatively small investment, providers can scale from very small to very large installations.Increasingly, enterprises and service providers are experiencing the need to extend network access to a broad range of remote users, including employees, customers, and partners. Successful remote access means being able to connect these users from practically any location, almost transparently. Varying demands of telecommuters and mobile users necessitate both ISDN and modem connections. Today, users expect to get the same access and quality of service they receive when locally connected. To meet this requirement, the remote access server must be part of the total network solution and scale with it to meet the growing remote access needs. The AS5200 combined with Cisco IOS software, meet these needs by extending the core infrastructure by providing secure, reliable dial-in connections. The AS5200 also supports the most complete set of access protocols of any access server in the industry, including Point-to-Point Protocol (PPP), IPX Control Protocol (IPXCP), AppleTalk Control Protocol (ATCP), AppleTalk Remote Access Protocol (ARAP), NetBIOS Frame Control Protocol (NBFCP), NetBIOS over TCP/IP, NetBEUI over PPP, protocol translation (PPP, SLIP, ARAP, X.25, TCP, LAT, Telnet), XRemote, V.110, and V.120.