Fan-Tray Assembly - Cisco ONS 15600 Reference Manual

1.10 Fan-Tray Assembly

Figure 1-11
The main power connections are made at the PDU side terminals at the top of the bay. To install
redundant power feeds, use four power cables and ground cables. For a single power feed, only two
power cables and one ground cable (all rated for at least 125-A capacity) are required. Use a conductor
with low impedance to ensure circuit overcurrent protection. The ground conductor must have the
capability to safely conduct any faulty current that might be imposed.
Cisco recommends the following wiring conventions, but customer conventions prevail:
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The ONS 15600 shelf has redundant –48 VDC power terminals on its backplane. The terminals are
labeled A FEEDS and B FEEDS and are located at the top left and right sides of the shelf behind clear
plastic covers.
1.10 Fan-Tray Assembly
The fan-tray assembly is located at the top of the ONS 15600 shelf front compartment. The fan-tray
assembly has three removable drawers that hold two fans each and fan-control circuitry for the
ONS 15600
Cisco ONS 15600 Reference Manual, R8.0
1-14
Front and Rear Bay Ground Holes
PDU frame
ground cable
Bay grounding
holes
Red wire for battery connections (–48 VDC)
Black wire for battery return connections (0 VDC)
The battery return connection is treated as DC-I, as defined in Telcordia GR-1089-CORE, issue 3
(Figure 1-12). You should only need to access the fans if a fan fails.
Chapter 1 Shelf and Backplane Hardware