Tadiran Telecom Coral IPx Office, Installation And Hardware Reference Manual, Page: 383 / 510

Coral IPx Office Installation Manual Shared Service Cards
9-71
Music Ba
ckgr
ound
and Music-
On
-Hold (M1/M2)
9
9.13
Music
Background and Music-On-Hold (M1/M2)
0
The U-RMI Office , U-MR Office, RMI Office and MR Office cards provide 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 9-12
and
Figure 9-14
are simplified circuit diagrams 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.
M1 Internal/External Music
Internal music (M1) is available in all cards. The selection between the internal or
external source is accomplished by P2 jumper located on the U-RMI Office, U-MR
Office, RMI Office and MR Office cards. See
Figure 9-13
.
Table 9-20
defines the
position of P2 for the music selection.
M2/P Paging/External Music
External music (M2/P) connector can be used as voice paging output. The selection
between the external music source or voice paging output is accomplished by P3
jumper located on the U-RMI Office, U-MR Office, RMI Office and MR Office cards.
See
Figure 9-15
.
Table 9-21
defines the position of P3 for the music selection.
...................................................................................................
1 Introduction
...................................................................................................
2 Circuit Description