S e c t i o n 4 - I n s t a l l a t i o n
75
door phone call cadence when it is first connected, this is normal and may be silenced by going
off and on-hook at a ringing extension, or simply waiting for a few seconds.
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. By default the contact
operates closes the contacts for 5 seconds, this may be extended to 10 seconds with system
programming, see page 44 for details.
Music on Hold Source
The telephone system provides a standard audio 3.5mm socket for an external music source, located
next to the V24 port. The music source should be 600
Ω
, 0 dBm / 775mV max, as found at the ‘line-
out’ connectors of many items of audio equipment. It is important to take anti-static precautions and
discharge any static build-up on your person before connecting this music source. It is recommended
that the telephone system be powered down for this operation. Note that the external music on hold
has to be activated before it is enabled, see page 52 for details.
Battery Back-up
The telephone systems are powered by an integral 220-240 V AC power supply. During mains failure
each of the analogue exchange lines are directly connected by relays to extensions within the system.
On the 206 the extensions are 11, 15, 17, on the 208 system they are 11, 12, 21 and 23, while on the
212 system they are 11, 12, 25 and 27. This provides a direct telephone to exchange link, no
telephone system services or ISDN exchange line operation will be possible. Calls cannot be put on
hold, transferred or diverted. A separate BBU system is available for the 206 and 208 systems to
power system in the event of mains power failure. The 212 system includes an optional BBU card
and only requires the addition of external batteries.
The optional battery back up unit to allow calls to be made and answered and all system features
such as hold, enquiry, transfer, diversion, conference etc. are possible. In ISDN applications it is not
possible to use the system at all during power failures without the battery back up unit.
BBU 206 / 208 systems
The BBU unit for 206 and 208 systems is housed in a similar plastic case to the telephone system and
is wall mounted close to the telephone system.
It is designed to operate with two 12V, 1.2 Ah sealed lead acid batteries of maximum dimensions 97
mm x 48.5mm x 57mm. The batteries are not supplied with the battery back up unit.
This unit provides the PABX with a 24-volt dc feed and a 75V
RMS,
25Hz sine wave ringing supply.
The unit will allow the PABX to operate for at least 1 hour and possibly up to 3 hours depending on
how many telephones are connected and on how much they ring. System software in the PABX
controls the ringing supply to maximise back up time.
206/208 Battery specifications
Height: 57mm
Width: 97
mm
Depth: 48.5
mm
Electrical spec:
12V 1.2Ah
Recommended source:
Yuasa A512/1.2S
