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LED Indicators
This document describes units manufactured after 13 January 2005. See the prior
version of this document for information about units manufactured on or before that date.
Whenever both T1 connections lose link or experience a T1 Alarm, the Ethernet link is
automatically be disabled (as indicated by no illumination of the Ethernet 100, Act and
Lnk LEDs). Upon reestablishment of at least one of the T1 connections, the Ethernet
link is reinstated and the Ethernet LEDs reflect current Ethernet Status.
Table 10. LEDs (1 of 2)
LED
STATE
T1
Flashing*
Connections
Green
Lnk (Port 1
Solid Green Problematic T1 connection
and Port 2)
No
Illumination
T1
No
Connections
Illumination
Alm (Port 1
and Port 2)
Solid
Amber
Pulsing*
Amber
Power
Solid Green TNE1520 is operational
INDICATION
T1 connection is
established and active
Red Alarm: The incoming
connection to the unit has
been lost; no data is being
received.
T1 is operational
Yellow Alarm: The outgoing
connection from the unit
has been lost; no data is
being transmitted.
Blue Alarm: An indirect
connection has been lost;
the unit may no longer be
receiving data from its
partner TNE1520.
12
ADDITIONAL
INFORMATION
Traffic is flowing.
A connection exists but
there is indication of a
problem with the T1 line.
If the outgoing connection
from the unit has also been
lost then the unit's partner
TNE1520 will be in Red
Alarm as well.
An established T1 link has
no alarm indications and is
operational unless the T1
Lnk LED remains unlit as
well, in which case the
TNE1520 is in Red Alarm.
The unit's partner
TNE1520 has lost its
incoming connection and is
in Red Alarm.
The unit's partner
TNE1520 has lost a
connection with an
intermediate device and is
in Red or Yellow Alarm.
If the Power LED is not
illuminated, it is unlikely
that the TNE1520 is
receiving power and
therefore none of the LEDs
will be illuminated.
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