1. Home
    2. /
  2. Manuals
    3. /
  3. Zyxel
    4. /
  4. P-661HNU-F1
    5. /
  5. 53
Page 261 / 404 Scroll up to view Page 256 - 260
P-661HNU-Fx User’s Guide
261
C
HAPTER
25
Diagnostic
25.1
Overview
You can use different diagnostic methods to test a connection and see the detailed
information. These read-only screens display information to help you identify
problems with the ZyXEL Device.
25.1.1
What You Can Do in this Chapter
•
Use the
Ping
screen to ping an IP address and see the ping statistics (
Section
25.2 on page 261
).
•
Use the
DSL Line
screen to check or reset your DSL connection (
Section 25.3
on page 262
).
25.2
The Ping Screen
Use this screen to ping an IP address. Click
Maintenance > Diagnostic
to open
the
Ping
screen shown next.
Figure 124
Maintenance > Diagnostic > Ping
Page 262 / 404
Chapter 25 Diagnostic
P-661HNU-Fx User’s Guide
262
The following table describes the fields in this screen.
25.3
The DSL Line Screen
Click
Maintenance > Diagnostic > DSL Line
to open the screen shown next.
Figure 125
Maintenance > Diagnostic > DSL Line
Table 80
Maintenance > Diagnostic > Ping
LABEL
DESCRIPTION
Ping
Type the IP address of a computer that you want to ping in order to test a
connection. Click
Ping
and the ping statistics will show in the diagnostic.
Page 263 / 404
Chapter 25 Diagnostic
P-661HNU-Fx User’s Guide
263
The following table describes the fields in this screen.
Table 81
Maintenance > Diagnostic > DSL Line
ITEM
DESCRIPTION
ATM
Status
Click this button to view your DSL connection’s Asynchronous Transfer Mode
(ATM) statistics. ATM is a networking technology that provides high-speed
data transfer. ATM uses fixed-size packets of information called cells. With
ATM, a high QoS (Quality of Service) can be guaranteed.
The (Segmentation and Reassembly) SAR driver translates packets into ATM
cells. It also receives ATM cells and reassembles them into packets.
These counters are set back to zero whenever the device starts up.
inPkts
is the number of good ATM cells that have been received.
inDiscards
is the number of received ATM cells that were rejected.
outPkts
is the number of ATM cells that have been sent.
outDiscards
is the number of ATM cells sent that were rejected.
ATM
Loopback
Test
Click this button to start the ATM loopback test. Make sure you have
configured at least one PVC with proper VPIs/VCIs before you begin this test.
The ZyXEL Device sends an OAM F5 packet to the DSLAM/ATM switch and
then returns it (loops it back) to the ZyXEL Device. The ATM loopback test is
useful for troubleshooting problems with the DSLAM and ATM network.
Page 264 / 404
Chapter 25 Diagnostic
P-661HNU-Fx User’s Guide
264
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 81
Maintenance > Diagnostic > DSL Line
ITEM
DESCRIPTION
Page 265 / 404
P-661HNU-Fx User’s Guide
265
C
HAPTER
26
Troubleshooting
26.1
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
•
Wireless Internet Access
•
USB Device Connection
•
UPnP
26.2
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.

Rate

4 / 5 based on 1 vote.

Popular Zyxel Models

Famous Router IPs
Famous Router Companies
Bookmark Our Site

Press Ctrl + D to add this site to your favorites!

Share
Top