VC-400LT/RT+ VDSL2 CO&CPE Router MANUAL Ver.B3
31
wet sections on the span. Use a loop-troubleshooting tool with a TDR to find and fix these problems.
If the bits per tone are low across the whole bandwidth, the cause is most likely DC troubles on the
loop, such as shorts or grounds. A major dip in bits per tone indicates AC trouble on the loop. To
verify the type of AC trouble, compare the bits per tone to SNR. If the noise influence and
bits-per-tone dip occur at the same frequency, the degraded performance is most likely due to a
transmission influence. The particular frequency will help identify the source of influence or
crosstalk.
Chapter 7. Configuration Interface of the Router
This section explains how to configure the router section of the VC-400LT/R using its
web-based configuration.
The part of the circuitry as well as the router configuration menu has been
ported from that of the reference kit to the VC-400LT/R reference board. As for
the menu, there are only a few differences:
The “adm1” port now is the port to the VDSL2 side. The port on the LAN is
“adm0”. It supports four Ethernet connections.
The IP addresses are used in this chapter are different from the examples in
the previous chapters.
The password used in this chapter is different from the examples in the
previous chapters.
7.1 Logging in to the VC-400LT/R
To log on to the VC-400LT/R Web Application, you must have a valid password. The
Administrator creates the log on user with its password. When one log on to the
VC-400LT/R Web Application, the LOGIN PASSWORD window is displayed as shown
in Figure 7.1.
Figure 7.1 VC-400LT/R Web Application
In the LOGIN PASSWORD window:
1. Enter the password in the Password text box. For an Admin user, the default
password is “admin”.
2. Click LOGIN to begin the configuration or click CANCEL in the LOGIN
PASSWORD window to cancel this log on operation.