Cisco ONS 15600 Manual de referência - Página 14

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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:

•

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