Karel MS48 Installation & Maintenance Guide
Edition 3.2
64
Figure B-33
MS48 is enhanced with a facility to provide the efficient use of the music source
by way of its external relay (see sec.III.13.). When the power switch of the music
source is connected to the relay on the MB48 motherboard and the necessary
programming is carried on, then the music source is automatically activated
when an external party is parked or put on hold or when an extension activates
the Background Music facility. Hence, the music source remains on only while a
call is parked or put on hold or when a user is listening to music on the
handsfree telephone.
III.13. EXTERNAL RELAY
The external relay at the down right corner of the MB48 motherboard can be used
to switch one of the following equipments provided that the relay is programmed
accordingly:
1) Door Opener
2) External Ringer (to ring for the incoming external calls)
3) External Announcement System (see sec.III.6)
4) External Music Source (see sec.III.12)
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