The Telebrás

Telebrás

Telebrás was the Brazilian state-owned monopoly telephone system. It was broken up in July 1998 into twelve separate companies, nicknamed the 'Baby Bras' companies, that were auctioned to private bidders...

 plug is the old Brazil

Brazil

Brazil , officially the Federative Republic of Brazil , is the largest country in South America. It is the world's fifth largest country, both by geographical area and by population with over 192 million people...

ian telephone plug

Telephone plug

A telephone plug is a type of male connector used to connect a telephone to the telephone wiring in a home or business, and in turn to a local telephone network. It is inserted into its female counterpart, a telephone "jack", commonly affixed to a wall or baseboard...

 and socket system. It uses a large plug (about 4cm x 4cm) with four flat metal pins, three of the pins having the same orientation and the fourth pin being rotated 90 degrees to make it impossible to plug in the wrong orientation.

Most newer installations use an RJ11 jack and plug instead of Telebrás.