User's Manual
BSX Isolated Audio Entry System 
PD-142 Issue 1  Installation and Operating Manual  Page 6 of 32 
Basic System Operation 
Making a Call 
The  Entrance  panel  has  a  push  button  for  each  flat  in  the  building,  engraved  with  the 
associated flat number. A caller pushes the required button and the phone will start to ring 
in the flat; this ringing tone will also be heard at the panel.  The ringing will continue for 30 
Seconds* or until the phone handset is picked up. 
Once the handset is picked up the resident can talk to the caller for up to 60S*. During this 
time the resident can press the lock button to release the door.  An electric lock release 
will  operate  for  a  fixed  duration  of  3  Seconds*  and  speech  will  continue  until  the  lock 
release has ceased operating.  Alternatively replacing the handset on hook will finish the 
call. 
Audible indication at the panel is provided both when the phone  is ringing and when the 
door  release  is  active.    The  door  release  tone  has  adjustable  volume,  while  the  ringing 
tone comes from the phone and is fixed. 
Privacy 
To ensure complete privacy of speech and freedom from interference from other residents, 
the audio and lock functions of the phones are disabled until the phone has been called. 
Ringer Mute 
Some models  of phone  have  additional features such  as Ringer  Mute which can  be 
activated during periods when the  sound of the phone ringing would be a nuisance (e.g. 
baby sleeping, youths pressing buttons). See specific Phone models for more details. 
Door Monitoring 
Door Status Indication (Door Monitoring) is available on some models; when the entrance 
door is left open, an LED indicator illuminates on the phone.  This function requires a door 
monitor switch to be installed at the door or in the lock release. 
Trades (Optional) 
If  independent  access  to  the  building  is  required  for  tradesmen  (e.g.  Postman)  then  an 
optional Trades button can be fitted to the panel.  When the Trades button is pressed the 
lock release  will activate for 3  Seconds*.    All the BSX systems have a  Time  Clock  (with 
auto  BST  and  battery  backup)  which  can  be  used  to  restrict  the  operating  hours  of  the 
Trades facility. 
Second Entrance 
On a system with two entrances the caller will be unable to ring any of the flats whilst the 
other entrance is already in use. The system will indicate busy by sounding an intermittent 
tone for 3 Seconds. 
Egress 
An optional Egress button can be fitted to the inside of the door to enable resident to freely 
exit the building.  A momentary press of the button will operate the electric lock release for 
3 Seconds*. 
*Lock and Ring and Speech times are programmable at installation – see Page 14 










