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Page 96 / 105 Scroll up to view Page 91 - 95
96
new one as the URL.
7
Remove any filters in LAN or WAN that block web service.
8
See also Section A.9.
The web configurator does not display properly.
Steps
Corrective Action
1
Make sure you are using Internet Explorer 5.0 and later versions.
2
Delete the temporary web files and log in again.
In Internet Explorer, click Tools, Internet Options and then click the
Delete Files ... button.
When a Delete Files window displays, select Delete all offline
content and click OK. (Steps may vary depending on the version of
your Internet browser.)
A.4 Login Username e Password
I forgot my login username and/or password.
Steps
Corrective Action
1
If you have changed the password and have now forgotten it, you
will need to upload the default configuration file. This will erase all
custom configurations and restore all of the factory defaults
including the password.
2
Press the RESET button for 10 seconds, and then release it. When
the PWR LED begins red, the defaults have been restored and the
ADSL Router restarts. Or refer to the Resetting the ADSL Router
section for uploading a configuration file via console port.
3
The default username is “admin”. The default password is
“atlantis”. The Password and Username fields are case
-sensitive.
Make sure that you enter the correct password and username
using the proper casing.
4
It is highly recommended to change the default username and
password. Make sure you store the username and password in a
save place.
A.5 LAN Interface
I cannot access the ADSL Router from the LAN or ping any computer on the LAN.
Steps
Corrective Action
1
Check the Ethernet LEDs on the front panel. A LAN LED should be
on if the port is connected to a computer or hub. If the 10M/100M
LEDs on the front panel are both off, refer to Section A.1.2.
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97
2
Make sure that the IP address and the subnet mask of the ADSL
Router and your computer(s) are on the same subnet.
A.6 WAN Interface
Initialization of the ADSL connection failed.
Steps
Corrective Action
1
Check the cable connections between the ADSL port and the wall
jack. The DSL LED on the front panel of the ADSL Router should be
on.
2
Check that your VPI, VCI, type of encapsulation and type of
multiplexing settings are the same as what you collected from your
telephone company and ISP.
3
Restart the ADSL Router. If you still have problems, you may need
to verify your VPI, VCI, type of encapsulation and type of
multiplexing settings with the telephone company and ISP.
I cannot get a WAN IP address from the ISP.
Steps
Corrective Action
1
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.
2
The username and password apply to PPPoE and PPoA
encapsulation only. Make sure that you have entered the correct
Service Type, User Name and Password (be sure to use the correct
casing).
A.7 Internet Access
I cannot access the Internet.
Steps
Corrective Action
1
Make sure the ADSL Router is turned on and connected to the
network.
2
If the DSL LED is off, refer to Section A.1.3.
3
Verify your WAN settings.
4
Make sure you entered the correct user name and password.
Internet connection disconnects.
Steps
Corrective Action
1
Check the schedule rules.
2
If you use PPPoA or PPPoE encapsulation, check the idle time-out
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98
setting.
3
Contact your ISP.
A.8 Remote Management
I cannot remotely manage the ADSL Router from the LAN or WAN.
Steps
Corrective Action
1
Refer to the Remote Management Limitations section in the
Firmware and Configuration File Management chapter for
scenarios when remote management may not be possible.
2
Use the ADSL Router’s WAN IP address when configuring from the
WAN.
Use the ADSL Router’s LAN IP address when configuring from the
LAN.
3
Refer to Section A.6 for instructions on checking your LAN
connection.
Refer to Section A.7 for instructions on checking your WAN
connection.
4
See also the Section A.4.
A.9 Remote Node Connection
I cannot connect to a remote node or ISP.
Steps
Corrective Action
1
Check WAN screen to verify that the username and password are
entered properly.
2
Verify your login name and password for the remote node.
3
If these steps fail, you may need to verify your login and password
with your ISP.
A.10 Frequently Asked Question
Question
Can I run an application from a remote computer over the
wireless network?
Answer
This will depend on whether or not the application is designed to
be used over a network. Consult the application’s user guide to
determine if it supports operation over a network.
Question
Can I play computer games with other members of the wireless
network?
Answer
Yes, as long as the game supports multiple players over a LAN
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99
(local area network).
Refer to the game’s user guide for more information.
Question
What is Spread Spectrum?
Answer
Spread Spectrum technology is a wideband radio frequency
technique developed by the military for use in reliable, secure,
mission-critical communications systems. It is designed to trade
off bandwidth efficiency for reliability, integrity, and security. In
other words, more bandwidth is consumed than in the case of
narrowband transmission, but the trade-off produces a signal that
is, in effect, louder and thus easier to detect, provided that the
receiver knows the parameters of the spread-spectrum signal
being broadcast. If a receiver is not tuned to the right frequency,
a spread-spectrum signal looks like background noise. There are
two main alternatives, Direct Sequence Spread Spectrum (DSSS)
and Frequency Hopping Spread Spectrum (FHSS).
Question
What is DSSS? What is FHSS? And what are their differences?
Answer
Frequency-Hopping Spread-Spectrum (FHSS) uses a narrowband
carrier that changes frequency in a pattern that is known to both
transmitter and receiver. Properly synchronized, the net effect is
to maintain a single logical channel. To an unintended receiver,
FHSS appears to be short-duration impulse noise. Direct-Sequence
Spread-Spectrum (DSSS) generates a redundant bit pattern for
each bit to be transmitted. This bit pattern is called a chip (or
chipping code). The longer the chip, the greater the probability
that the original data can be recovered. Even if one or more bits in
the chip are damaged during transmission, statistical techniques
embedded in the radio can recover the original data without the
need for retransmission. To an unintended receiver, DSSS appears
as low power wideband noise and is rejected (ignored) by most
narrowband receivers.
Question
Would the information be intercepted while transmitting on air?
Answer
WLAN features two-fold protection in security. On the hardware
side, as with Direct Sequence Spread Spectrum technology, it has
the inherent security feature of scrambling. On the software side,
WLAN offers the encryption function (WEP) to enhance security
and access control.
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100
Question
What is WEP?
Answer
WEP is Wired Equivalent Privacy, a data privacy mechanism based
on a 64-bit or 128-bit shared key algorithm, as described in the
IEEE 802.11 standard.
Question
What is infrastructure mode?
Answer
When a wireless network is set to infrastructure mode, the
wireless network is configured to communicate with a wired
network through a wireless access point.
Question
What is roaming?
Answer
Roaming is the ability of a portable computer user to communicate
continuously while moving freely throughout an area greater than
that covered by a single access point. Before using the roaming
function, the workstation must make sure that it is the same
channel number with the access point of dedicated coverage area.
Question
What is ISM band?
Answer
The FCC and their counterparts outside of the U.S. have set aside
bandwidth for unlicensed use in the ISM (Industrial, Scientific and
Medical) band. Spectrum in the vicinity of 2.4 GHz, in particular,
is being made available worldwide. This presents a truly
revolutionary opportunity to place convenient high-speed wireless
capabilities in the hands of users around the globe.
Question
What is the IEEE 802.11g standard?
Answer
Approved in June, 2003 as an
IEEE
standard for wireless local
area networks (
WLAN
s), 802.11g offers wireless transmission over
relatively short distances at up to 54
megabit
s per second (Mbps)
compared with the 11 megabits per second of the
802.11b
(
Wi-Fi
)
standard. Like 802.11b, 802.11g operates in the 2.4
GHz
range
and is thus compatible with it.

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