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Chapter 1: Understanding ISDN and the Express XL/XLT
61200.070L1-1 Express XL/XLT User Manual 17
WAN Indicators
LNK Flashes when the link is being negotiated; solid when the link
is active.
B1 Flashes when a call on the B1 channel is in progress; solid
when a call is connected.
B2 Flashes when a call on the B2 channel is in progress; solid
when a call is connected.
Loop Indicates ISDN layers status. Indicator is off when layer 1 is
down. A fast flash indicates layer 1 is up and layer 2 is down.
A slow flash indicates layer 2 is up and layer 3 is down. A sol-
id illumination indicates all layers are up.
PWR Flashes when self-test has failed; solid when unit is powered
on and self-test has passed.
Test Indicators
ERR Illuminates when self-test or front panel test has failed.
B1/B2 Indicates test selected by front panel buttons.
Figure 1-6
Express XL/XLT LEDs
Pushbutton Tests
The echo request test can be executed by pressing the SELECT button one time
and pressing TEST. A ping test is executed by pressing the SELECT button
twice and pressing TEST. The IP address pinged comes from the previously
pinged address set in the menu. If it is blank, the default gateway is used. If
the default gateway is blank, an error is indicated. The ERR indicator illumi-
nates if any pings are not returned. The dial self-test is invoked from the front
panel if the SELECT button is pressed three times. The LDN(s) must be al-
ready programmed for this test to work.
RX
TX
LI
COL
JAB
ERR
LNK
B1
B2
TEST
Express XL
LOOP
PWR
SELECT
TEST