| Each telecommuter site router
has LED displays that allow you to verify that the router components
are installed and functioning properly. On the Cisco 766
router, you can use the LEDs on the front of the router to determine
router performance and operation, as shown in the Figure.
The Cisco 700 series LEDs and their
descriptions are as follows:
- RD -- The ready LED
indicates the router operating status. This LED is on when power
is supplied to the router, the router passes the self-test, and
it is operating normally.
- NT1 -- On Cisco 700 series
routers that have an internal NT1, the on LED indicates that the
NT1 and ISDN switch have synchronized over the ISDN line. When
blinking five blinks per second, the internal NT1 is attempting
to synchronize with the telephone switch. When blinking one
blink per second, the internal NT1 is attempting to synchronize
with the ISDN terminal devices.
- LINE -- An online LED
indicates synchronization between the NT1 S interface and the
ISDN terminal device(s). It also indicates framing between the
router and the ISDN switch.
- LAN -- An on LAN LED
indicates that frames have been sent to or received from the
Ethernet within the last minute.
- LAN RXD -- The receive LAN
LED blinks when frames are received from the Ethernet.
- LAN TXD -- The transmit LAN
LED blinks when frames are sent to the Ethernet.
- CH1 -- The channel 1 LED
blinks when a call is connected on the first ISDN B channel.
After the call is established, the LED remains on.
- CH1 RXD --The channel 1
received LED blinks when packets are received from the first
ISDN B channel.
- CH1 TXD -- The channel 1
transmitted LED blinks when packets are sent on the first ISDN B
channel.
- CH2 -- The channel 2 LED
blinks when a call is connected on the second ISDN B channel.
After the call is established, the LED remains on.
- CH2 RXD -- The channel 2
received LED blinks when packets are received from the second
ISDN B channel.
- CH2 TXD -- The channel 2
transmitted LED blinks when packets are sent on the second ISDN
B channel.
- PH1, PH2 -- Plain old
telephone service (POTS) ports are on when a telephone, fax, or
modem is in use.
There is also one LED on the rear panel, the
LINK LED, which remains lit when the router is configured as an
Ethernet hub, connected to an Ethernet hub, or configured as a node,
and a valid physical connection to another Ethernet device is
established. For a Cisco 766, the ready LED indicates the
router is on and has passed its self-tests.
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