Remote access servers are used to authenticate remote users before allowing them to access a computer network. These devices can either be discrete "chassis based" pieces of equipment, or they can be "server based" RAS adapters that are plugged into a standard server PCI 2.1 slot. RAS adapters are usually found in larger enterprise type applications.

Adapter Card Remote Access Servers

Network managers have a number of issues to consider when enabling remote access to their networks. They must ensure that only authorized users are able to gain access, and that there is sufficient capacity to handle the outside connections. RAS adapters that can handle up to 60 simultaneous connections make these issues relatively easy to deal with.

Easily Increase Capacity

The better RAS adapters, such as the Patton DataFire 2977, are easy to install and can easily be scaled to accommodate increased capacity requirements. Plugging the adapter into a standard 2.1 PCI slot, installing the device driver and finally configuring the ports, is all that it takes to install a RAS adapter. Capacity is increased by simply plugging in additional adapters as needed. The number of ports required is often determined by the number of remote users, with typical user-to-port ratios of between 5:1 and 8:1.

RAS adapters are available for T1/E1 and ISDN PRI connections as well as for ISDN BRI service. In addition to handling remote access, they may also feature modem pooling, World Wide Web access, branch office networking and have advanced fax capabilities. RAS adapters are available for both Windows as well as Linux operating systems.