Power Distribution Unit - Cisco ONS 15600 Reference Manual

Chapter 1 Shelf and Backplane Hardware

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 SDH 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 SDH shelf). The PDU supplies six 50A power feeds to the shelves. (The PDU
provided with the ONS 15600 SDH 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 SDH shelf.
shows the PDU output covers found at the top rear of the bay.
Cisco supports only one ONS 15600 SDH shelf per bay.
Note
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 SDH 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.
78-18400-01
Figure 1-11 shows the front and rear bay ground holes.
Cisco ONS 15600 SDH Reference Manual, Release 9.0
1.8 Power Distribution Unit
Figure 1-6 on page 1-7
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