Baldwin Boxall BT8 Operating Instructions Manual - page 2
- 2 -
Issue 9
BT8 PHONE PAGER
Connecting the telephone system to the Public Address makes the paging facility available to all. It
gives everyone the opportunity to contact other members of staff easily and quickly - this avoids the
need to contact reception and asking them to put out a call.
The BT8 is designed for use both with phones that have MF signalling and those that do not.
1.
With MF signalling.
Ability to select up to 8 zones.
Live messages can be broadcast.
Messages can be recorded and then replayed which avoids any problems of howl-round i.e.
feedback when the phone being used is adjacent to a loudspeaker.
The recorded message can be replayed either once or twice. This is determined by using an
internal
selector.
All of the above facilities are selected on the phone keypad.
2.
Without MF signalling.
Single
zone
only.
Messages can be live or recorded. This is determined using an internal selector.
Recorded messages can be 55 seconds long. When used in the “live” mode, the call will be terminated
automatically after 2.5 minutes.
The BT8 is either connected to a designated 2 wire analogue extension port via a master line jack unit
or can be connected directly to the paging port that is supplied by many telephone switches.
The output is at microphone or line level and is via a 25 way D connector that is compatible with our
desk microphones and plugs into a BMS25 socket box (supplied with the BT8).
The unit has 2 L.E.D. indicators for “Mains ON” and “Amplifier Accessed”.
This product is not suitable for connection to a keyphone extension.
PLEASE NOTE: The BT8 should only be connected via an amplifier input that requires an
“Access” connection, and should not be connected to a permanently live (or VOX) input.
The Access minimises the possibility of spurious or unintentional messages being broadcast.
Busy Input (if required)
If the public address amplifier is busy the BT8 will receive a 20 - 30 V DC supply on pins 22 and 23
of the D connector which will send the normal busy (engaged) tone to the caller.
N.B. The amplifier input into which the BT8 is connected must not provide a busy condition.
When using the busy facility with a Mitre or Adept amplifier it is necessary to connect a 24 V DC
supply to pin 23 of the BMS25.
This 24V DC supply may be obtained from either pin 6 of the relevant input connector on Mitre, or
from pin 5 of the amplifier sub socket on Adept.
Connect pin 22 on the BMS25 to pin 5 of the relevant input connector on Mitre, or pin 4 of the sub
socket on Adept – these are taken to 0v when the amplifier is busy.