Cisco 1751V Hardware Installation Manual page 23

Chapter 1 Cisco 1751 Router Overview
Table 1-4 Front-Panel LEDs
LED Color
PWR Green
OK Green
ETH
ACT Green
COL Yellow
SLOTØ
Ø Green
78-11258-04
Cards Supported
–
–
–
–
ISDN
Serial and CSU/DSU
2-port serial
VIC-2E&M
VIC-2FXO
VIC-2FXS
VIC-2BRI-ST-NT/TE
WIC1-ADSL
LED Meaning
On when DC power is being supplied to the router.
On when the router has successfully booted up and
the software is functional. This LED blinks during
the power-on self-test (POST).
Refer to Table 3-1 in the
for information on how to use this LED for router
diagnostics.
Blinks when there is network activity on the
Ethernet port.
Blinks when there are packet collisions on the local
Ethernet network.
On when the first ISDN B channel is connected.
Blinks when data is being sent to or received from
the port. For the VIC-2BRI-ST-NT/TE, blinks when
data is being sent to or received from any of the B
channels.
Cisco 1751 Router Hardware Installation Guide
Front-Panel LEDs
"Troubleshooting" chapter
1-7