The 3640 router front view

Jun 23,2009 by alperen

System and
RPS LEDs
Network
activity LEDs
PCMCIA
LEDs

The front panel LEDs are presented as follows:
System The System LED is used to show both the system power and operation characteristics.
When the System LED is off, the router is not receiving power; a solid green LED denotes
proper, powered operation. An amber indicator shows that the router is not functioning correctly,
but that power is connected. A blinking green light indicates that the router is powered
and working properly, but it’s in ROM monitor mode. Alternating amber and green show that
the self-test is running. As indicated, a single LED can provide a great deal of information.
RPS The RPS LED denotes the status of the redundant power supply. On the 3640, only one
power supply can be operational at a time. An off LED reflects that the RPS is not installed.
A blinking green LED denotes that both the internal and redundant power supplies are operational;
administrators should reconfigure the installation to run on one or the other system.
A solid green LED denotes that the RPS is operational, and amber shows that the RPS is
installed but not in operation.
Network Activity There are two sets of LEDs in the Network Activity section of the router.
There are four LEDs per set, with one per slot. The Ready LEDs illuminate to show that a module
is installed in the slot and operational. An off LED indicates that nothing is installed in the
slot or that it is not functioning. The Active LEDs blink to indicate activity.
PCMCIA The PCMCIA (or PC Card) LEDs light up to show activity on that slot. This should
serve as a warning to not remove the flash card when reading or writing data. Flash cards are
also called PCMCIA memory cards and they store the router’s flash image.
The module LEDs vary widely depending on the type of interface; however, most include
at least a link or enable the LED to denote connectivity. Many LEDs also include activity
indicators—the serial module, for example, also includes clocking indicators to show the
presence or absence of synchronization.