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Chapter 4 — Power supplies
Ringing Generator
Power supply LED
Under-voltage
553-3121-100
Standard 2.0
The NTMW11 Power Supply provides the following ringing generator for
telephones:
•
Ringing voltage: 70, 75, 80, 86V.
•
Ringing frequency: 20, 25, 50 Hz, switch selectable.
•
Ring sync: A pulse 500 us wide, 6 or 11 ms (±3 ms) before the positive
going zero crossing of the ringing waveform (11 ms for 20/25 Hz).
•
Power: The output capability is 8VA which is capable of ringing 8CA4
ringers.
The LED on the power supply faceplate is extinguished when there is a
problem with the power supply.
Under-voltage to the NTMW11 Power Supply results in partial failure of the
Option 11C Compact system. The faceplate LED extinguishes.
Under-voltage, in the case of +5.1V, results in the complete shutdown
of the system.
Table 22
outlines the nominal and under-voltage limits of the NTMW11
Power Supply.
September 1998
WARNING
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