Nortel Meridian 1 option 11C Planning And Installation Manual page 120

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Power supplies are shipped separate from the cabinets.
If installing an AC-powered system, an NTDK78 ac/dc power supply is
required with its appropriate line cord for each cabinet.
If installing a DC-powered system, an NTDK72 DC power supply is required
for each cabinet.
Additionally, one NTAK0420 power cable is required for each cabinet (for a
DC power source).
The power supplies are equipped with a series of switches which must be set
before the units are installed in the cabinet (Refer to Figure 37 on page 121).
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