1. Home
    2. /
  2. Manuals
    3. /
  3. Zyxel
    4. /
  4. VMG1312-B10D
    5. /
  5. 56
Page 276 / 331 Scroll up to view Page 271 - 275
Chapter 40 Diagnostic
VMG1312-B Series User’s Guide
276
ATM sets up virtual circuits over which end systems communicate. The terminology for virtual
circuits is as follows:
Figure 167
Virtual Circuit Topology
Think of a virtual path as a cable that contains a bundle of wires. The cable connects two points and
wires within the cable provide individual circuits between the two points. In an ATM cell header, a
VPI (Virtual Path Identifier) identifies a link formed by a virtual path; a VCI (Virtual Channel
Identifier) identifies a channel within a virtual path. A series of virtual paths make up a virtual
circuit.
F4 cells operate at the virtual path (VP) level, while F5 cells operate at the virtual channel (VC)
level. F4 cells use the same VPI as the user data cells on VP connections, but use different
predefined VCI values. F5 cells use the same VPI and VCI as the user data cells on the VC
connections, and are distinguished from data cells by a predefinded Payload Type Identifier (PTI) in
the cell header. Both F4 flows and F5 flows are bidirectional and have two types.
•
segment F4 flows (VCI=3)
•
end-to-end F4 flows (VCI=4)
•
segment F5 flows (PTI=100)
•
end-to-end F5 flows (PTI=101)
OAM F4 or F5 tests are used to check virtual path or virtual channel availability between two DSL
devices. Segment flows are terminated at the connecting point which terminates a VP or VC
segment. End-to-end flows are terminated at the end point of a VP or VC connection, where an ATM
link is terminated. Segment loopback tests allow you to verify integrity of a PVC to the nearest
neighboring ATM device. End-to-end loopback tests allow you to verify integrity of an end-to-end
PVC.
Note: The DSLAM to which the Device is connected must also support ATM F4 and/or F5
to use this test.
Note: This screen is available only when you configure an ATM layer-2 interface.
•
Virtual Channel (VC)
Logical connections between ATM devices
•
Virtual Path (VP)
A bundle of virtual channels
•
Virtual Circuits
A series of virtual paths between circuit end points
Page 277 / 331
Chapter 40 Diagnostic
VMG1312-B Series User’s Guide
277
Figure 168
Maintenance > Diagnostic > OAM Ping
The following table describes the fields in this screen.
Table 126
Maintenance > Diagnostic > OAM Ping
LABEL
DESCRIPTION
Select a PVC on which you want to perform the loopback test.
F4 segment
Press this to perform an OAM F4 segment loopback test.
F4 end-end
Press this to perform an OAM F4 end-to-end loopback test.
F5 segment
Press this to perform an OAM F5 segment loopback test.
F5 end-end
Press this to perform an OAM F5 end-to-end loopback test.
Page 278 / 331
VMG1312-B Series User’s Guide
278
C
HAPTER
41
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
•
Device Access and Login
•
Internet Access
•
Wireless Internet Access
•
USB Device Connection
•
UPnP
41.1
Power, Hardware Connections, and LEDs
The Device does not turn on. None of the LEDs turn on.
1
Make sure the Device is turned on.
2
Make sure you are using the power adaptor or cord included with the Device.
3
Make sure the power adaptor or cord is connected to the Device and plugged in to an appropriate
power source. Make sure the power source is turned on.
4
Turn the 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 1.5 on page 20
.
2
Check the hardware connections.
3
Inspect your cables for damage. Contact the vendor to replace any damaged cables.
4
Turn the Device off and on.
Page 279 / 331
Chapter 41 Troubleshooting
VMG1312-B Series User’s Guide
279
5
If the problem continues, contact the vendor.
41.2
Device Access and Login
I forgot the IP address for the Device.
1
The default LAN 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 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 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
21
.
I forgot the password.
1
See the cover page for the default login names and associated passwords.
2
If those do not work, you have to reset the device to its factory defaults. See
Section 1.6 on page
21
.
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 8.2 on page 127
), 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 Device.
2
Check the hardware connections, and make sure the LEDs are behaving as expected. See
Section
1.5 on page 20
.
3
Make sure your Internet browser does not block pop-up windows and has JavaScripts and Java
enabled.
4
If it is possible to log in from another interface, check the service control settings for HTTP and
HTTPS (
Maintenance > Remote MGMT
).
Page 280 / 331
Chapter 41 Troubleshooting
VMG1312-B Series User’s Guide
280
5
Reset the device to its factory defaults, and try to access the Device with the default IP address.
See
Section 1.6 on page 21
.
6
If the problem continues, contact the network administrator or vendor, or try one of the advanced
suggestions.
Advanced Suggestions
•
Make sure you have logged out of any earlier management sessions using the same user account
even if they were through a different interface or using a different browser.
•
Try to access the Device using another service, such as Telnet. If you can access the Device,
check the remote management settings and firewall rules to find out why the Device does not
respond to HTTP.
I can see the
Login
screen, but I cannot log in to the Device.
1
Make sure you have entered the password correctly. See the cover page for the default login names
and associated passwords. 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 Device. Log
out of the Device in the other session, or ask the person who is logged in to log out.
3
Turn the Device off and on.
4
If this does not work, you have to reset the device to its factory defaults. See
Section 41.1 on page
278
.
I cannot Telnet to the Device.
See the troubleshooting suggestions for
I cannot see or access the Login screen in the web
configurator.
Ignore the suggestions about your browser.
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.

Rate

4.5 / 5 based on 2 votes.

Popular Zyxel Models

Famous Router IPs
Famous Router Companies
Bookmark Our Site

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

Share
Top