Karel MS48 Installation & Maintenance Guide
Edition 3.2
9
SPS48 – MB48 Connector
SPS48 – RNT48 Connector
Pin Signal
Pin
Voltage
1 Ring
Control
1 -
2 Buzzer
Control
2 GND
3
- 24 VDC
3
-24 VDC
4
+ 5 VDC
4
+24 VDC
5 Data
6
GND
SPS48 - KY16 Connector
7 Busy
Pin
Signal
1
GND
SPS48 – PWT48 Connector
2
Data
Between Pins
Voltage
3
Busy
1 & 3
15.5 VAC
4
-
2 & 3
15.5 VAC
SPS48 - Console/Feature Phone/Pager/ ISDN Adaptor Connector
Pin Signal
1 Data
2 +12
VDC
3 GND
MS48 system can be backed up with a battery of 12 VDC in order to provide the
continuity of the operation in case of mains failure, by the help of the battery
backup circuitries of SPS48. For the cases where a battery is to be connected to
the system, it is strongly recommended to choose a dry battery for the proper
operation.
The MS48 system that is equipped with a 12 V – 7 Ah battery can continue to run
for 5 hours under an average traffic of 35 %.
There exists a connector on the SPS48 card for battery connection (see Figure
A-6). The F-Type fuse of 8 A / 12 VDC for battery is also available on SPS48 card,
residing at the down right corner of the power connector.
SPS48 is also capable of charging the battery while the system power is on and the
system is running under low traffic. Besides, there exists a low voltage battery cut-
off circuitry, which turns itself off when the battery voltage goes below 8.5 VDC and
does not start until the battery voltage is above 11.5 VDC. So, preventing full
discharge of the battery SPS48 makes the lifetime of the battery longer.
The SPS48 card also has the system buzzer that may be used as an external
ringer for the incoming external calls.
The dimensions of the SPS48 card are 11 cm x 11.5 cm and the weight is 0.3 kg.
Summary of Contents for MS48
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