Pub. 42004-693L2C
Model 69320-101 Voice Network Adapter
Page: 2 of 15
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04/06
LED Status
Description
MCU FLT
(red)
On
The VNA has lost communication with the MCU. The MCU and the VNA
continuously update handshaking information. If the MCU is not updating that
information as the VNA expects, then the VNA turns on this LED. This LED
may be On during maintenance of the MCU.
Off
The “On” condition is not occurring.
RAI/RYEL
(yellow)
On
The VNA is receiving the T1 Yellow Alarm (Remote Alarm Indication), and is
not transmitting the T1 Yellow Alarm.
Flashing
90% On
The VNA both is receiving and is transmitting the T1 Yellow Alarm. The
frequency of flashing is approximately one Hertz.
Flashing
50% On
The VNA is transmitting the T1 Yellow Alarm, and is not receiving the T1
Yellow Alarm. The frequency of flashing is approximately one Hertz.
Flashing
10% On
The T1 transceiver on the VNA is not initialized. The frequency of flashing is
approximately one Hertz.
Off
All of the above four conditions are not occurring.
AIS/RBL
(blue)
On
The VNA is receiving the T1 Blue Alarm (Alarm Indication Signal), and is not
transmitting the T1 Blue Alarm.
Flashing
90% On
The VNA both is receiving and is transmitting the T1 Blue Alarm. The
frequency of flashing is approximately one Hertz.
Flashing
50% On
The VNA is transmitting the T1 Blue Alarm, and is not receiving the T1 Blue
Alarm. The frequency of flashing is approximately one Hertz.
Flashing
10% On
The T1 transceiver on the VNA is not initialized. The frequency of flashing is
approximately one Hertz.
Off
All of the above four conditions are not occurring.
LOF/RLOS
(red)
On
The VNA is not synchronized with the received T1 signal (Loss of Frame or
Receive Loss of Synchronization), and does not detect a short on its T1
transmit line.
Flashing
90% On
The VNA both is not synchronized with the received T1 signal and detects a
short on its T1 transmit line. The frequency of flashing is approximately one
Hertz.
Flashing
50% On
The VNA detects a short on its T1 transmit line, and is synchronized with the
received T1 signal. The frequency of flashing is approximately one Hertz.
Flashing
10% On
The T1 transceiver on the VNA is not initialized. The frequency of flashing is
approximately one Hertz.
Off
All of the above four conditions are not occurring.
