Adtran TRC4208 Manuel D’Utilisation
TRACER 4208 System Manual
Section 6 Troubleshooting Guide
612804208L1-1A
© 2003 ADTRAN, Inc.
57
RF LOW LED
If the
RF LOW
LED is
ON
(solid red), it is an indicator that the received signal is within 10 dB
(approximately) of the minimum operable signal. This condition is typically indicative of a path problem.
Recommended Actions:
1. Verify the far-end transmitter power setting is the value that the link planning budget allows.
2. Check all coaxial cable connectors for solid connections. Check for water and corrosion around any of
the connectors. If water is apparent in the coaxial connectors, replace the coaxial cable and the
connectors, making sure to properly weatherproof the replacements.
connectors, making sure to properly weatherproof the replacements.
3. Verify the RF signal path by verifying the antenna alignment.
4. Check the integrity of the cable plant.
5. Check the integrity of lightning arrestors.
T1 Interface Alarm LEDs
If the
A
LARM
LED is
ON
(solid red), it is an indication that the TRACER 4208 is detecting an active T1
alarm. To identify the T1 interface in alarm and the specific alarm present, display the
T1(
X
) S
TATUS
screens
and check the
T1(
X
) I
NTERFACE
A
LARMS
field.
Recommended Actions:
1. Display the T1(
X
) S
TATUS
screen and check the T1(
X
) I
NTERFACE
A
LARM
field to identify the active alarm.
2. Follow the steps below for the appropriate alarm.
LOS Alarm (Red Alarm)
LOS A
LARM
is an indication that the TRACER 4208 may be unable to detect a viable T1 received signal
from the connected T1 equipment. This error may be due to a degraded signal or no signal, or may be
caused by improper framing.
caused by improper framing.
Recommended Actions:
1. Verify that the T1 cable is connected to the T1 interface on the TRACER 4208.
2. Verify the connections at the opposite end of the T1 cable.
3. Verify that the framing mode (D4 or ESF) is the same for both the TRACER 4208 and the T1
equipment.
Yellow Alarm
A Yellow Alarm is generated by the attached equipment. When the attached equipment’s T1 interface is
in Red Alarm, the TRACER 4208 generates a Yellow Alarm.
in Red Alarm, the TRACER 4208 generates a Yellow Alarm.
Recommended Actions:
1.Follow the troubleshooting steps for Red Alarm, but do so at the attached equipment.
Blue Alarm
A remote alarm (alarm indication signal or AIS) is generated by the attached equipment. The root cause
must be determined at the attached equipment. A typical cause of a blue alarm is a lack of input to a
CSU.
must be determined at the attached equipment. A typical cause of a blue alarm is a lack of input to a
CSU.
Recommended Actions:
1.Verify the input to any attached data equipment.