Cisco Systems 6200 appendix Fan Tray, Power Entry Modules PEMs, Auxiliary Port, Power Terminals

1 Hardware Description 78-5296-02 10/02/98

Auxiliary Port

J40, a 9-pin female connector on the Cisco 6200 backplane, is an EIA/TIA-232 (RS-232) serial port connecting to the management processor card (MPC). J40 is an auxiliary craft port that can be used to connect devices such as terminals, modems, or laptop computers to the Cisco 6200. It is accessible from the rear of the chassis. For a pinout list, see Appendix A, “Pin Assignments.”

Power Terminals

J17, J18, J19, and J20, located at the upper right corner of the rear panel, are screw terminals for –48 VDC power input and return:

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J17 is the –48V terminal for power circuit A.

J19 is the +48V (return) terminal for power circuit A.

J18 is the –48V terminal for power circuit B.

J20 is the +48V (return) terminal for power circuit B.

Power circuit A is connected to the power entry module (PEM) on the left (as you face the front of the chassis); power circuit B is connected to the PEM on the right.

Unused Connectors

The Cisco 6200 backplane contains several connectors and a jumper that are not used in the current release. See Appendix A, “Pin Assignments,” for a list of the unused items.

1.2.3 Fan Tray

The fan tray, located at the bottom of the chassis, houses eight fans that maintain proper temperatures inside the chassis, plus an air filter. The filter should be removed and cleaned periodically. Refer to Chapter 6, “Preventive Maintenance,” for complete information on cleaning the air filter.

Caution The Cisco 6200 cooling fans must run continuously. The system may suffer thermal damage if the fans stop for more than 10 minutes. (At ambient temperatures above 104 F(40 C),thermal damage may occur sooner.)

1.2.4 Power Entry Modules (PEMs)

One or two PEMs distribute DC power to the chassis. The Cisco 6200 needs only one active PEM to operate; if two PEMs are installed, the second PEM’s power source serves as a hot backup to the first PEM’s power source.

Each PEM is connected to a single DC power source. For power redundancy, two PEMs must be installed, and two separate DC power sources must be connected to the chassis. If one power source is connected, only one PEM is required. There is no benefit to connecting two power sources to a chassis with one PEM, or to installing two PEMs in a chassis with one power source.

The PEMs reside at the top of the Cisco 6200 chassis, and they are installed and accessed from the front. DC power (–48V) enters the chassis through screw terminals on the rear panel of the chassis. The PEMs receive power through the backplane and internal cabling.

The power bay on the left is wired to power circuit A; the bay on the right is wired to power circuit B. (The circuits are identified at the power terminals on the backplane.)

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