GE GFK-1541B - Manual (Page 44)

GFK-1541B Chapter 2 Installation 2-31
2
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.