DTE-DCE Interface Cont

o    The specification for control signals is conceptually reversed from that for data transmission o    A positive voltage means ON and a negative voltage means OFF •     Electrical Specifications (BIT rate) o    A  final  important  function  of  electrical  specifications  is  definition of Bit Rate o    EIA  232  allows  for  a  maximum  bit  rate  of  20Kbps  although  in practice it is often is exceeded    Functional Specifications o    Two different implementations of EIA 232 are available: -DB 25 -DB 9 o    DB 25   connector defines the functions assigned to each of the 25 pins in the DB 25 connector