Zyxel P-660HN-T1A Router Manual PDF (Setup & Configuration Guide)

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Chapter 22 Diagnostic

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The following table describes the fields in this screen.

Table 93

Maintenance > Diagnostic > DSL Line

LABEL

DESCRIPTION

ATM Status

Click this 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.

inF4Pkts

is the number of ATM Operations, Administration, and

Management (OAM) F4 cells that have been received. See ITU

recommendation I.610 for more on OAM for ATM.

outF4Pkts

is the number of ATM OAM F4 cells that have been sent.

inF5Pkts

is the number of ATM OAM F5 cells that have been received.

outF5Pkts

is the number of ATM OAM F5 cells that have been sent.

openChan

is the number of times that the ZyXEL Device has opened a

logical DSL channel.

closeChan

is the number of times that the ZyXEL Device has closed a

logical DSL channel.

txRate

is the number of bytes transmitted per second.

rxRate

is the number of bytes received per second.

ATM Loopback

Test

Click this 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.

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Chapter 22 Diagnostic

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232

DSL Line

Status

Click this to view statistics about the DSL connections.

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.

output power upstream

is the amount of power (in decibels) that the

ZyXEL Device is using to transmit to the ISP.

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 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!"

Capture All

Logs

Click this to display information and statistics about your ZyXEL Device’s

ATM statistics, DSL connection statistics, DHCP settings, firmware

version, WAN and gateway IP address, VPI/VCI and LAN IP address.

Table 93

Maintenance > Diagnostic > DSL Line (continued)

LABEL

DESCRIPTION

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C

HAPTER

23

Troubleshooting

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

23.1

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.

One of the LEDs does not behave as expected.

1

Make sure you understand the normal behavior of the LED. See

Section 1.6 on

page 25

.

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Chapter 23 Troubleshooting

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234

2

Check the hardware connections.

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.

23.2

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 1.7 on page 26

.

I forgot the password.

1

The default admin password is

1234

.

2

If this does not work, you have to reset the device to its factory defaults. See

Section 1.7 on page 26

.

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

.

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Chapter 23 Troubleshooting

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235

• If you changed the IP address (

Section 7.2 on page 91

), use the new IP

address.

• 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

JavaScripts and Java enabled. See

Appendix C on page 281

.

4

Reset the device to its factory defaults, and try to access the ZyXEL Device with

the default IP address. See

Section 1.7 on page 26

.

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 to the

WAN

port or is connected wirelessly, use a

computer that is connected to a

ETHERNET

port.

I can see the

Login

screen, but I cannot log in to the ZyXEL Device.

1

Make sure you have entered the password correctly. The default admin password

is

1234

. The field is 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 23.1 on page 233

.

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.

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