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Page 236 / 344 Scroll up to view Page 231 - 235
Chapter 27 Diagnostic
P-2601HN(L)-F1 Series User’s Guide
236
DSL Line
Status
Click this button to view statistics about the DSL connections.
1.
noise margin downstream
is the signal to noise ratio for the
downstream part of the connection (coming into the ZyXEL Device from
the ISP). It is measured in decibels. The higher the number the more
signal and less noise there is.
2.
output power upstream
is the amount of power (in decibels) that the
ZyXEL Device is using to transmit to the ISP.
3.
attenuation downstream
is the reduction in amplitude (in decibels) of
the DSL signal coming into the ZyXEL Device from the ISP.
Discrete Multi-Tone (DMT) modulation divides up a line’s bandwidth into sub-
carriers (sub-channels) of 4.3125 KHz each called tones. The rest of the
display is the line’s bit allocation. This is displayed as the number (in
hexadecimal format) of bits transmitted for each tone. This can be used to
determine the quality of the connection, whether a given sub-carrier loop has
sufficient margins to support certain ADSL transmission rates, and possibly
to determine whether particular specific types of interference or line
attenuation exist. Refer to the ITU-T G.992.1 recommendation for more
information on DMT.
The better (or shorter) the line, the higher the number of bits transmitted for
a DMT tone. The maximum number of bits that can be transmitted per DMT
tone is 15. There will be some tones without any bits as there has to be
space between the upstream and downstream channels.
Reset
ADSL Line
Click this button to reinitialize the ADSL line. The large text box above then
displays the progress and results of this operation, for example:
"Start to reset ADSL
Loading ADSL modem F/W...
Reset ADSL Line Successfully!"
Table 73
Maintenance > Diagnostic > DSL Line (continued)
ITEM
DESCRIPTION
Page 237 / 344
P-2601HN(L)-F1 Series User’s Guide
237
C
HAPTER
28
Troubleshooting
28.1
Overview
This chapter offers some suggestions to solve problems you might encounter. The
potential problems are divided into the following categories.
•
Power, Hardware Connections, and LEDs
•
ZyXEL Device Access and Login
•
Internet Access
•
Phone Calls and VoIP
•
Wireless LAN Troubleshooting
28.2
Power, Hardware Connections, and LEDs
The ZyXEL Device does not turn on. None of the LEDs turn on.
1
Make sure the ZyXEL Device is turned on.
2
Make sure you are using the power adaptor or cord included with the ZyXEL
Device.
3
Make sure the power adaptor or cord is connected to the ZyXEL Device and
plugged in to an appropriate power source. Make sure the power source is turned
on.
4
Turn the ZyXEL Device off and on.
5
If the problem continues, contact the vendor.
Page 238 / 344
Chapter 28 Troubleshooting
P-2601HN(L)-F1 Series User’s Guide
238
One of the LEDs does not behave as expected.
1
Make sure you understand the normal behavior of the LED. See
Section 1.5 on
page 24
.
2
Check the hardware connections. See the Quick Start Guide.
3
Inspect your cables for damage. Contact the vendor to replace any damaged
cables.
4
Turn the ZyXEL Device off and on.
5
If the problem continues, contact the vendor.
28.3
ZyXEL Device Access and Login
I forgot the IP address for the ZyXEL Device.
1
The default IP address is 192.168.1.1.
2
If you changed the IP address and have forgotten it, you might get the IP address
of the ZyXEL Device by looking up the IP address of the default gateway for your
computer. To do this in most Windows computers, click
Start > Run
, enter
cmd
,
and then enter
ipconfig
. The IP address of the
Default Gateway
might be the IP
address of the ZyXEL Device (it depends on the network), so enter this IP address
in your Internet browser.
3
If this does not work, you have to reset the device to its factory defaults. See
Section 1.6 on page 25
.
I cannot see or access the
Login
screen in the web configurator.
1
Make sure you are using the correct IP address.
• The default IP address is 192.168.1.1.
• If you changed the IP address (
Section
on page 118
), use the new IP
address.
Page 239 / 344
Chapter 28 Troubleshooting
P-2601HN(L)-F1 Series User’s Guide
239
• If you changed the IP address and have forgotten it, see the troubleshooting
suggestions for
I forgot the IP address for the ZyXEL Device.
2
Check the hardware connections, and make sure the LEDs are behaving as
expected. See the Quick Start Guide.
3
Make sure your Internet browser does not block pop-up windows and has
JavaScript and Java enabled. See
Appendix C on page 291
.
4
Reset the device to its factory defaults, and try to access the ZyXEL Device with
the default IP address. See
Section 1.6 on page 25
.
5
If the problem continues, contact the network administrator or vendor, or try one
of the advanced suggestions.
Advanced Suggestions
•
Try to access the ZyXEL Device using another service, such as Telnet. If you can
access the ZyXEL Device, check the remote management settings and firewall
rules to find out why the ZyXEL Device does not respond to HTTP.
•
If your computer is connected wirelessly, use a computer that is connected to a
LAN
port.
I can see the
Login
screen, but I cannot log in to the ZyXEL Device.
1
Make sure you have entered the user name and password correctly. The default
user name is
admin
. These fields are case-sensitive, so make sure [Caps Lock] is
not on.
2
You cannot log in to the web configurator while someone is using Telnet to access
the ZyXEL Device. Log out of the ZyXEL Device in the other session, or ask the
person who is logged in to log out.
3
Turn the ZyXEL Device off and on.
4
If this does not work, you have to reset the device to its factory defaults. See
Section 28.2 on page 237
.
I cannot Telnet to the ZyXEL Device.
See the troubleshooting suggestions for
I cannot see or access the Login screen in
the web configurator.
Ignore the suggestions about your browser.
Page 240 / 344
Chapter 28 Troubleshooting
P-2601HN(L)-F1 Series User’s Guide
240
I cannot use FTP to upload / download the configuration file. / I cannot use FTP to
upload new firmware.
See the troubleshooting suggestions for
I cannot see or access the Login screen in
the web configurator.
Ignore the suggestions about your browser.
28.4
Internet Access
I cannot access the Internet.
1
Check the hardware connections, and make sure the LEDs are behaving as
expected. See the Quick Start Guide and
Section 1.5 on page 24
.
2
Make sure you entered your ISP account information correctly. These fields are
case-sensitive, so make sure [Caps Lock] is not on.
3
If you are trying to access the Internet wirelessly, make sure the wireless settings
in the wireless client are the same as the settings in the AP.
4
Disconnect all the cables from your device, and follow the directions in the Quick
Start Guide again.
5
If the problem continues, contact your ISP.
I cannot access the Internet anymore. I had access to the Internet (with the ZyXEL
Device), but my Internet connection is not available anymore.
1
Check the hardware connections, and make sure the LEDs are behaving as
expected. See the Quick Start Guide and
Section 1.5 on page 24
.
2
Turn the ZyXEL Device off and on.
3
If the problem continues, contact your ISP.

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