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Chapter 1 Cisco 1721 Router Overview
Front Panel LEDs
1-6
Cisco 1721 Router Hardware Installation Guide
78-13834-02
Figure 1-3 Front Panel LEDs
Table 1-4 Front Panel LEDs
LED Label Color Description
PWR Green On means that DC power is being supplied to the router.
OK Green On means that the router has successfully booted up and the software is
functional. This LED blinks during the power-on self-test (POST).
See the section “OK LED Diagnostics” in Chapter 3,
“Troubleshooting,” for information on how to use this LED for router
diagnostics.
WIC0
ACT/CH0 Green Serial and DSU/CSU cards—Blinks when data is being sent to or
received from the port on the card in the WIC0 slot.
ISDN cards—On solid when the first ISDN B channel is up for the card
in the WIC0 slot.
2-port serial cards—Blinks when data is being sent to or received from
the first port on the 2-port card in the WIC0 slot.
ACT/CH1 Green Serial and CSU/DSU cards—Remains off.
ISDN cards—On solid when the second ISDN B channel is up for the
card in the WIC0 slot
2-port serial cards—Blinks when data is being sent to or received from
the second port on the 2-port card in the WIC0 slot.
65537
PWR
ACT
ACT/CH0
ACT/CH1
OK
ACT/CH0
WIC0
WIC1
ETH
ACT/CH1
COL