Manualsbrain.com
  1. Manuais
  2. Marcas
  3. Adtran
  4. TRC6420
  5. Manual Do Utilizador

Adtran TRC6420 Manual Do Utilizador

Download
Página de 108
TRACER 6420 System Manual
Section 8  Troubleshooting Guide
612806420L1-1A
Copyright © 2005 ADTRAN, Inc.
105
RF LOW LED
If the 
RF LOW
 LED is 
ON
 (solid red), the received signal is approaching 0 V of RSSI. This condition is 
typically indicative of a path or installation 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.
3. Verify the RF signal path by verifying the antenna alignment.
4. 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 6420 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 6420 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.
Recommended Actions:
1. Verify that the T1 cable is connected to the T1 interface on the TRACER 6420.
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 6420 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 6420 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.
Recommended Actions:
1. Verify the input to any attached data equipment.