Troubleshooting - Hatteras HN4000 Hardware Installation Manual

1

Troubleshooting

The procedures for troubleshooting the HN4000 hardware are provided in Table 7‐1. The steps
within the procedures are listed in the suggested order that they be performed.
Modular, field
replaceable cooling
unit
System
Main
Status LEDs
chassis
Figure 7-1 Device Connectors and LEDs
Table 7-1 HN4000 Troubleshooting Steps
Condition
All front‐panel LEDs are off.
The red System FAIL LED is on.
920550-5020 Rev 14
Serial Craft 10/100
Management
Port
Port
Subscriber ports - 40 pairs of
2BASE-TL and bonded 2BASE-TL
Solution
1. Verify that the device is receiving ‐48 VDC power.
2. Verify that the power cable is wired correctly (see "Installing the Ground
and Power Cables" on page
3. If only one power source is being used, switch the power cables to the
connection that is not in use (for example, to the "B" connection if the "A"
connections are being used.
4. Replace the device with a unit known to be in proper working condition.
In normal operation, the system FAIL LED will blink on and off immediately
after the device is powered up (while the device runs its self‐test diagnostics).
If the system FAIL LED is on after diagnostics have run, it indicates that the
device has detected a hardware problem.
1. Remove power from the device and power it back up.
2. Replace the device with a unit known to be in proper working condition.
Field replaceable high-
speed network module
with dual-redundant ports
2‐6).
HN4000 Hardware Installation Guide
Redundant
power
Stack MLT
inputs
ports ports
Grounding
Alarm
port
7
lug