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Cisco ONS 15600 Reference Manual, R7.2
Chapter 1 Shelf and Backplane Hardware
1.8 Power Distribution Unit
1.8 Power Distribution Unit
The PDU consists of a mounting chassis, A- and B-side power modules, an alarm module, and a rear I/O
unit. The ONS 15600 PDU has LEDs that alert you to Critical, Major, Minor, and remote alarms on the
node. Each module can support three 100A input power feeds, 48 VDC power load (based on a fully
loaded ONS 15600 shelf). The PDU supplies six 50A power feeds to the shelves. (The PDU provided
with the ONS 15600 is capable of supplying power to up to three shelves.)
A three-shelf bay at the minimum operational voltage of –36 VDC requires 69-A per feed (207 A total).
A three-shelf bay at the nominal operational voltage of –48 VDC requires 52-A per feed (156 A total).
Each of the three feeds should be protected by its own 100-A breaker. A bus bar system, rather than
wiring, provides a reliable, low resistance path to the ONS 15600 shelf. Figure 1-6 on page 1-7 shows
the PDU output covers found at the top rear of the bay.
Note
Cisco supports only one ONS 15600 shelf per bay.
1.9 Power and Ground Description
Ground the equipment according to Telcordia standards or local practices. The ground connection is
located on the front of the bay’s top horizontal rails. The ONS 15600 provides two #12 tapped holes to
accommodate the grounding lug. The lug must be a dual-hole type and rated for at least 125-A capacity.
Figure 1-11 shows the front and rear bay ground holes.