CI-Slot_百科_亚北维客

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The CI slot is a feature that gives a receiver the capability to receive PayTV channels. "CI" stands for "Common Interface". A receiver with one or two CI slots usually can decode a variety of different encryption systems (such as Nagravision, Viaccess, etc.) as long as the appropriate Conditional Access Module, or CAM, is inserted into the CI slot. The CAM that is used will determine what encryption system is to be decoded. In other words, if you want to watch Viaccess encrypted channels, you would need a Viaccess CAM. The SmartCard needed to authorize the reception of the PayTV channels would be inserted into the CAM.

A receiver can also have the CAM "embedded", or built into, the receiver. In this case you would only need the SmartCard. PayTV providers in the USA or Canada such as DishNetwork or Bell ExpressVu use receivers with embedded Nagravision CAM's. Unfortunately, there really isn't much use for a receiver with a CI slot in the USA or Canada. Even though, for example, you can get a Nagravision CAM, it will not work with Dish or Bell ExpressVu signals. Only their own receivers work with their own signals. There are quite a few PayTV channels available on Intelsat Americas 5 at 97 deg west, but here too you would need to buy their receivers in order to get those channels.