After the deregulation of the telephone industry in , the responsibility for premises cabling was left in the hands of the building owner instead of the service provider. The industry was then left with inconsistent standards.

1984

Explanation:

In 1984 , first deregulation of telecommunication took place majorly American regions.It is situation , AT&T was made deprived of all the Bell companies and assets.They were ordered by the court to continue running long distance telephone communication.

It gave unstable standards for telecommunication which led to AT&T and Bell companies leaving of slot from telecommunication zone after a while as building owners were not able to handle responsibility adequately or telephone communication.  

answer; proximity;