Cisco 1721 Hardware Installation Manual page 6

Front Panel LEDs
Figure 1-3 Front Panel LEDs
PWR
OK
Table 1-4 Front Panel LEDs
LED Label Color
PWR Green
OK Green
WIC0
ACT/CH0 Green
ACT/CH1 Green
Cisco 1721 Router Hardware Installation Guide
1-6
WIC1
WIC0
ACT/CH0
ACT/CH0
ACT/CH1
ACT/CH1
Description
On means that DC power is being supplied to the router.
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"
"Troubleshooting," for information on how to use this LED for router
diagnostics.
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.
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.
Chapter 1 Cisco 1721 Router Overview
ETH
ACT
COL
in Chapter 3,
78-13834-02