Configuring Citrix MetaFrame for Windows 2000 Terminal Services

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Modems


One of the business requirements that Citrix MetaFrame may provide is remote access to mission-critical applications. If so, there is the question of whether to have dial-up users call a Citrix MetaFrame server directly, or to call a Remote Access Server (RAS) elsewhere on the network.


If you already have a RAS server in place, you may not need to consider modems at all. If you do not, or feel that there is a need for users to access the Citrix MetaFrame directly, then you should select your modems. Citrix MetaFrame should be configured to support the number of concurrent dial-in users you expect. If you need 15 people to dial in and only eight of them will be dialing in concurrently, then you need a minimum of eight modems in your modem pool. You should include more than your minimum to be able to handle periods of high demand and for redundancy in case of modem failure. To handle multiple modems, you can purchase modem cards that support multiple modems, or even external modem pools that are rack-mountable.


Up to this point, the word modem refers to analog modems. In some areas, such as Europe, you may find that you need an Integrated Services Digital Network (ISDN) modem pool. ISDN provides digital access over copper telephone wires. There are two configurations:


1.    Basic Rate Interface (BRI) A total of 144 Kbps bandwidth using one data (D) channel at the rate of 16 Kbps and two bearer (B) channels at the rate of 64 Kbps. D channels carry overhead traffic, while B channels carry voice and data. BRI runs over standard copper telephone cables.

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