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Cisco 761, Cisco 765, Cisco 771 and Cisco 775 routers do not have NT1 LEDs.
Note
Cisco 761, Cisco 762, Cisco 771 and Cisco 772 routers do not have PH1 and PH2 LEDs.
Table 1-1 lists the LEDs and their functions.
Table 1-1
Front-Panel LED Functions
LED
RD (Cisco 760 series)
RDY (Cisco 770
series)
NT1
(Cisco 762,
Cisco 766, Cisco 772,
and Cisco 776 only)
LINE
LAN
RXD
TXD
LK1 (Cisco 770 only)
LK2 (Cisco 770 only)
LK3 (Cisco 770 only)
Function
Indicates the router operating status. On when power is supplied to the
router, the router passes the self-test, and is operating normally.
• On when the internal NT1 and the ISDN switch are synchronized.
• Blinking (5 blinks per second) indicates that the internal NT1 is
attempting to synchronize with the telephone switch.
• Blinking (1 blink per second) indicates that the internal NT1 is
attempting to synchronize with the ISDN terminal devices.
On when the NT1 S interface and the ISDN terminal device(s) are
synchronized. Also indicates framing between the router and the
ISDN switch.
On when packets have been sent to or received from the Ethernet
within the last minute.
Blinks when packets are received from the LAN.
Blinks when packets are sent to the LAN.
On when the first LAN link of the unmanaged hub is connected.
Blinks (once every 1.5 seconds) when there is a problem with the
connection.
On when there is a connection on the second LAN link of the
unmanaged hub is connected. Blinks (once every 1.5 seconds) when
there is a problem with the connection.
On when there is a connection on the third LAN link of the
unmanaged hub is connected. Blinks (once every 1.5 seconds) when
there is a problem with the connection.
Overview 1-11
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Troubleshooting
