COMMUTATOR OF PHONE LINES 

Commutator is intended for commutation of N-phones of central battery (CB) system and connection of its subscribers to one urban telephone line.

The commutator operates by three mode:

•  N pones of CB system;
• spreading (coupled operation of two switchboards for the purpose to increase  number of subscribers  of the CB system);
• conference communication (connecting all subscribers to one line).

The device consists from:

• commutator with handset set and dialer for CB system;
• linear dashboard  for subscribers  connection.

The call from subscribers is displayed by light-emitting diode indication and the sound alarm system. 

Commutation of subscribers is carried out by microswitcher.