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The usual ISDN connection carries data at 64 or 128 kilobits per second before compression, which is up to about five times as fast as a 28.8 modem connection. But ISDN also usually requires a more costly telephone line and a special ISDN-computer interface. Most Internet Service Providers (ISPs) charge a higher rate for ISDN connections, both to offset the cost of the interface and to pay for the larger capacity needed to service higher-demand connections. Furthermore, the service is not offered in all geographic areas. Still, if you spend a lot of time downloading sounds or graphics, you may find ISDN worthwhile.
