GE GFK-1541B manual Ports on the CPU374 RS-232, RJ-11 Port Station Manager Port

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The seven Ethernet LEDs are briefly turned ON whenever a restart is performed in the Operational state by pressing and releasing the Restart pushbutton (described below). This allows you to verify that the Ethernet LEDs are operational.

Each RJ-45 port has two green LED indicators on it. The upper indicator, labeled LINK/ACT, lights when the link is physically present and blinks when traffic is detected on the port. Traffic at the port does not necessarily mean that traffic is present at the Ethernet Interface, because the traffic can be going between the two ports of the switch. The lower indicator, labeled 100MBPS, lights if the network connection is 100Mbps.

See “Verifying Proper Power-Up of the Ethernet Interface” for more LED information.

Ethernet Restart Pushbutton

The Ethernet Restart pushbutton serves two functions: LED test and Restart. These functions behave similarly in all states.

Pressing the Ethernet Restart pushbutton will disrupt Ethernet communications (including any communications to other devices attached to the embedded switch).

LED Test: Any time the Ethernet Restart pushbutton is pressed, the seven Ethernet LEDs flash ON. The operator should visually verify that the LEDs go OFF and then ON at this time. Then the Interface performs a restart.

Restart: Pressing the Ethernet Restart pushbutton requests a restart of the Ethernet Interface. When the Restart pushbutton is pressed, the seven Ethernet LEDs go out then flash ON, then power-up diagnostics run, and the software on the Interface is restarted into the Operational state.

Ports on the CPU374

RS-232, RJ-11 Port (Station Manager Port)

The RS-232, 6-pin, RJ-11 “phone jack” port is used to connect a terminal or terminal emulator to access the Station Manager software on the Ethernet Interface. A cable is needed to connect the terminal, emulator, or Software Loader to the Ethernet Interface (see Appendix B, “Communications Ports Characteristics”).

Ethernet Ports

There are two RJ-45 Ethernet ports on the Ethernet Interface. Either or both of these ports may be attached to other Ethernet devices. Each port automatically senses the data rate (10Mbps or 100Mbps), duplex (half duplex or full duplex), and cabling arrangement (straight through or crossover) of the attached link.

Caution

The two ports on the Ethernet Interface must not be connected, directly or indirectly to the same device. The hub or switch connections in an Ethernet network must form a tree, otherwise duplication of packets may result.

CPU374 Labels

Default Station Address Label

The Default Station Address label lists the MAC address to be used by this Interface.

Serial Number Label

The Serial Number Label indicates the serial number of this Interface.

GFK-1541B Chapter 2 Installation 2-31