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In DStv XtraView, the primary decoder is linked with one or more secondary decoders. It means all decoders share the same subscription. However, a customer is allowed connecting of a maximum of two decoders with the primary decoder. Obviously, the installer uses this arrangement for Extra View setup DStv on the premises of the customer.
In this arrangement, the primary decoder uses LNB or a smart cable to send a heartbeat signal to secondary decoders after every 90 seconds. If any of the secondary decoders fail to receive a heartbeat signal, it displays Error 143 message. However, this arrangement of DStv extra view set up is not possible for a subscriber accessing DStv through a single large dish installed for the entire community living in an apartment building. For such customers, decoders can be linked with the primary decoder using the DStv Smart switch.