These set-top devices are connected to the cable feed.

Analysts say Microsoft's dominance of the personal computer industry leaves the makers of set-top devices nervous and receptive to alternatives.

The institute distributes the set-top devices, which cost $130 to $280.

Mr. Thieme said that publicity about the built-in decoder had increased interest in the set-top device.

In both cases, the set-top device will be operated with a remote-control unit that is similar to control devices used for today's cable boxes and televisions.

AT&T said yesterday that it would increase that commitment by another 2.5 million to 5 million set-top devices.

The venture will provide set-top devices for televisions that will allow consumers to increase the number of channels they receive.

The set-top device comprises three subcomponents.

Thomson Consumer Electronics is building set-top devices that decode the digital signals and keep track of billing information.

Each subscriber will get a computerized "smart card" to insert in the set-top device to unscramble the satellite signals.