Tadiran Telecom Coral IPx 800 Series, Installation Procedure And Hardware Reference Manual

Page: 357 / 400

Power Supplies
7-43
PS
19
AC Power Su
pply U
n
it
7
0
Figure 7-12
displays a block diagram of the PS19 AC power supply.
The PS19 AC includes one AC-DC converter and one switch-mode DC-DC converter
that convert 98-126VAC and 198-253VAC (47-63Hz) input power to:
„
DC outputs
„
Message and Ring outputs
DC Output Power
„
-48VDC
„
+5VDC
„
–5VDC
„
+12VDC
„
–12VDC
Message and Ring Circuits
The -120VDC and
85V
RMS
voltages are provided for ringers to drive the ringers and
message waiting lamps of single line telephones connected to SLT ports of the system.
„
–120VDC for SLT message waiting lamps
„
85V
RMS
for SLT ringers
Ring Generator
The ring generator is capable of generating ringing up to 20 ports simultaneously at
20Hz or at 25Hz. The ringing frequency is configured by setting jumper J2 on the
PS19 AC circuit board. See
page 7-45, Ringer Frequency Adjustment
.
The current is used for ringing on industry standard, SLT, and magneto telephone
station ports. The ring generator provides high voltage (85V
RMS
) ring generator
current required by SLT station ports of the 8SLS, 16SLS, 24SLS, or 8SM cards.
Messaging
The messaging generator is capable of generating –120VDC for message lamps. It is
used to light neon lamps on SLT ports of the 8SLS, 16SLS, or 24SLS cards.
NOTE:
For
8SA and 24SA cards
t
he message and ringer generator
s are
provided by the
8/24SA card.
2 Circuit Description