Nortel Meridian 1 option 11C Planning And Installation Manual page 51

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Each Option 11C cabinet may be powered solely from a DC source if it is
equipped with the following:
• NTDK72 DC power supply
• NTAK28 Junction box.
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Note: The NTDK72 has a built-in circuit breaker that will trip if the
voltage difference at its input terminals drops below -42.5 V dc
+/- 1.0 V dc.
Do not allow the voltage difference between the input terminals of the
NTDK72 to exceed 57 V dc. Doing so may result in damage to the
equipment and a safety hazard to personnel.
The minimum size of the conductors required between the DC source and the
Junction box is shown in Figure 8 on page 51.
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