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Page 316 / 427 Scroll up to view Page 311 - 315
P-2602H(W)(L)-DxA Series User’s Guide
316
Chapter 26 Diagnostic
Figure 184
Diagnostic: DSL Line
The following table describes the fields in this screen.
Table 124
Diagnostic: DSL Line
LABEL
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.
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 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 317 / 427
P-2602H(W)(L)-DxA Series User’s Guide
Chapter 26 Diagnostic
317
DSL Line Status
Click this button 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.
attentuation 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!"
Capture All Logs
Click this button 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 124
Diagnostic: DSL Line (continued)
LABEL
DESCRIPTION
Page 318 / 427
P-2602H(W)(L)-DxA Series User’s Guide
318
Chapter 26 Diagnostic
Page 319 / 427
P-2602H(W)(L)-DxA Series User’s Guide
Chapter 27 Troubleshooting
319
C
HAPTER
27
Troubleshooting
This chapter covers potential problems and the corresponding remedies.
27.1
Problems Starting Up the ZyXEL Device
27.2
Problems with the LAN
Table 125
Troubleshooting Starting Up Your Device
PROBLEM
CORRECTIVE ACTION
None of the
lights turn on
when I turn on
the ZyXEL
Device.
Make sure that the ZyXEL Device’s power adaptor is connected to the ZyXEL Device
and plugged in to an appropriate power source. Make sure that the ZyXEL Device and
the power source are both turned on.
Turn the ZyXEL Device off and on.
If the error persists, you may have a hardware problem. In this case, you should
contact your vendor.
Table 126
Troubleshooting the LAN
PROBLEM
CORRECTIVE ACTION
The
ETHERNET
lights do not turn
on.
Check your Ethernet cable connections (refer to the
Quick Start Guide
for details).
Check for faulty Ethernet cables.
Make sure your computer’s Ethernet Card is working properly.
I cannot access
the ZyXEL
Device from the
LAN.
If
Any IP
is disabled, make sure that the IP address and the subnet mask of the
ZyXEL Device and your computer(s) are on the same subnet.
Page 320 / 427
P-2602H(W)(L)-DxA Series User’s Guide
320
Chapter 27 Troubleshooting
27.3
Problems with the WAN
Table 127
Troubleshooting the WAN
PROBLEM
CORRECTIVE ACTION
The
DSL
light is
off.
Check the telephone wire and connections between the ZyXEL Device
DSL
port
and the wall jack.
Make sure that the telephone company has checked your phone line and set it up
for DSL service.
Reset your DSL line to reinitialize your link to the DSLAM. For details, refer to
Section 26.2 on page 315
.
I cannot get a
WAN IP address
from the ISP. (The
INTERNET
light is
red.)
The ISP provides the WAN IP address after authenticating you. Authentication
may be through the user name and password, the MAC address or the host name.
The username and password apply to PPPoE and PPPoA encapsulation only.
Make sure that you have entered the correct
Service Type
,
User Name
and
Password
(be sure to use the correct case). Refer to
Section 7.5 on page 98
.
I cannot access
the Internet.
Make sure the ZyXEL Device is turned on and connected to the network.
Verify your WAN settings. Refer to
Chapter 7 on page 93
.
Make sure you entered the correct user name and password.
If you use PPPoE pass through, make sure that bridge mode is turned on.
The Internet
connection
disconnects.
If you use PPPoA or PPPoE encapsulation, check the idle time-out setting. Refer
to
Section 7.5 on page 98
.
Contact your ISP.

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