Tadiran Telecom Coral IPx 500, Руководство по установке

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Shared Service Ports
9-63
Mu
sic Backgr
oun
d an
d Music-On-Hold
(M1/
M2
)
9
9.11
Music
Background and Music-On-Hold (M1/M2)
The Coral IPx 500 provides, via the MSBipx, the following common system functions:
„
Two music inputs, one of which can be internal.
„
Music-on-hold interface (two ports).
„
Key telephone background music interface (two different sources)
Figure 9-13
is a simplified circuit diagram of the two Music Interfaces.
The external music (M1,M2) interfaces are electrically identical. Audio signals to the
system are passed through the audio coupling transformer to the interface. A direct
current (DC) blocking capacitor protects the secondary winding of the audio coupling
transformer from conducting DC energy. As a music input the circuit operates as an
input only, and so it can be used to play but not record music.
Internal music (M1) is available in some countries. The selection between the internal
or external source is accomplished by JU9 jumper located on the MSBipx card. See
Figure 9-1
.
Table 9-5
defines the position of JU9 for the music selection.
The system music source M1 may be either from an internal or an external source.
Figure 9-14
displays the jumper settings for the source type.
Table 9-5 Music M1
Internal/External
Selection JU9 Jumper
Setting
1 Introduction
2 Circuit Description
3 Configuring the Music M1 Jumper to External or Internal
JU9 1-2 2-3
M1 Internal External
M2 External External