S e c t i o n 4 - I n s t a l l a t i o n
59
25Hz Ringer Card
Note: This option may be fitted as standard, see Figure 4-6 on page 57 for the board location.
Some older fax machines or automatic answering equipment may not be designed to operate with
the 50Hz ringing generated by the telephone system. The ringer card option provides a true 25Hz
sinewave ringing waveform to ensure compatibility.
1. First disconnect the telephone system from the mains power outlet.
2. Disconnect the transformaer leads from SK27 on the main pcb.
3. Connect the transformer leads to socket X2 on the 25Hz ringer card.
4. Connect socket X1 on the Ringer card to SK27 on the main PCB. The connector can only be
fitted with the components facing away from the transformer.
5. Replace cover, then re-connect the mains power. Ensure the power LED lights when power is
applied.
6. Make a test call to a SLT extension and verify it rings correctly.
Door Phones
The telephone system may support one or two door phones, depending on the configuration
purchased. The door phone is a proprietary unit designed to work with this telephone system only. It
provides a two-way speech link between the door phone and any extension. The unit provides a
button for ringing and a permanently lit LED for easy location. As it provides a two-way speech link
the door phone is not restricted to doorways, it may be used anywhere an intercom is required.
Contents
Door phone
Two wall plugs
Two wall screws
Installation
The door phone must be connected to the system with standard telephone cable. It must be placed
in a location away from the rain.
Unscrew the front fixing screw and unclip the wall mounting bracket.
Attach the bracket to the wall using the wall plugs and screws provided.
Connect the two screw terminals on the door phone to the door phone connectors
labelled DR1V on the MDF for door phone 1, or DR2V for door phone 2, if supported.
See Figure 4-3 for details, note that the cable should first be fed through the cable entry
hole of the wall bracket before connecting. The polarity is not important. Also note that it
is not necessary to power down the telephone system during this operation. The telephone
system will ring with a door phone call when it is first connected, this is normal and may be
silenced by going off and on-hook at a ringing extension.
Clip the cover back onto the wall unit and replace the retaining screw.
The telephone system provides a dry relay contact for door latch operation with each door phone.
Door phone 1 uses the relay latch labelled 'DrRly', while door phone 2 uses the contacts labelled
‘Alm_rly NO’ This is used to drive an electric door latch, purchased separately. Note that this must
be powered independently. Maximum rating is 24 volts 1 amp AC/DC.
Important!
