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Chapter 8. Internet and TCP/IP Connectio... > Using Multiple Modems or ISDN Channe...

Using Multiple Modems or ISDN Channels Simultaneously

If you chose ISDN Internet service, your primary reason for doing so was probably its ability to use both ISDN channels simultaneously to get full 128Kbps throughput. You have to arrange for this “two channel” service with your ISP, and there may be additional costs, but it's a great way to get extra speed when DSL or cable Internet service isn't available. Combining two distinct connections into one big data pipe is called Multilinking. You can also use multiple analog modems to connect to some ISPs to get a similar rate boost, although this ties up multiple telephone lines, and more importantly, few ISPs support Multilink analog connections.

The procedure for setting up a two-channel call depends on what type of modem you have. If you're using an external ISDN modem connected through a serial cable (or an ISDN router connected to a network adapter) you'll have to follow the setup instructions provided by the modem manufacturer. With some modems, you specify the telephone number something like this: “5551212+5551212,” which instructs the modem to dial your ISP's modem bank at 555-1212 for the first channel, and then to dial the same number again to establish the second channel. You'll have to find out how it's done for your particular modem. Your ISP will help you set this up.


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