Tadiran Telecom Coral IPx 800 Series, Инструкция по установке и справочник по аппаратной части

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7-6
Coral IPx 800 Installation Manual
PS
19 D
C
Power Sup
ply U
nit
7
Figure 7-3
presents a block diagram of the PS19 DC power supply.
Power Input Section
The DC input consists of: passive filter, inrush current, and an on/off switch. The DC
input is protected against reverse polarity.
DC Output Power
DC to DC converters convert the –48VDC input power to the following outputs:
„
+5VDC, +12VDC
„
–5VDC, –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.
„
–120 VDC for SLT (Single Line Telephone) message waiting lamps
„
85V
RMS
for SLT ringers
Ring Generator
The ring generator is capable of generating ringing for up to 20 ports simultaneously
at 20Hz or at 25Hz. The ringing frequency is selected with the JU1 configuration
jumper on the PS19 DC circuit board. See
page 7-9, 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