BS-6450-4 › Complete Document History
Private branch exchanges for connection to public switched telephone networks run by certain public telecommunications operators. Specification for ports


Obsolete Revision Information:
   REPLACED BY BS-7378-3 - WITHDRAWN IN 2009 - May 1, 2009
   AMD 10396 - AMENDMENT 2 FOR 1993 EDITION - April 2, 1999
   1993 EDITION - Private branch exchanges for connection to public switched teleph - Dec. 15, 1993