3Com NETBuilder SI Using Manual page 12

Serial LEDs
WAN LEDs
LAN LEDs
Error LED Meanings
Troubleshooting During the Load Phase
Troubleshooting During the Test Phase
Errors Indicated by the Serial LEDs
Errors Indicated by the WAN LEDs
Performing Loopback Tests
Response to Local Loopback Assertion
Performing a Loopback Test on the ISDN Port (43x, 53x, 44x and
54x) 133
Prerequisites
Performing a V.54 Loopback Test on the CSU/DSU Port
(45x and 55x)
Performing a Local Loopback Test on the CSU/DSU Port
(45x and 55x)
Performing a Remote Loopback Test on a 56/64 Kbps CSU/DSU
Module 139
Performing a Local Loopback Test on the T1/FT1 Port
(46x and 56x)
Performing a Remote Loopback for V.54 on a T1/FT1 Port
Performing a Remote ATT Loopback Test on the T1/FT1 Port
Performing a Remote ANSI Loopback Test on the T1/FT1 Port
QRSS Testing on a T1/FT1 Port
Performing a Loopback Test on a Serial Port
Performing a Memory Dump
Configuring the Dump Destination
Obtaining the MAC Address
Creating a File for the Memory Dump
Verifying the TFTP Process
Verifying the Memory Dump Procedure
B
R
ELOADING THE
Reloading the Software
Load Errors 152
124
125
125
126
133
133
135
137
141
145
147
148
S S
YSTEM OFTWARE
151
126
131
131
132
133
143
144
146
147
149
142
142
143