Operation Manual

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contact another device on the same segment, it transmits to that station directly using a simple discovery
technique. If the target station does not exist on the same segment as the source station, then the source
actually has no idea how to get to the target.
One of the configuration parameters transmitted to each network device is its default gateway. This address
is configured by the network administrators and it informs each personal computer or other network device
where to send data if the target station does not reside on the same subnet as the source. If your machine
can reach all stations on the same subnet (usually a building or a sector within a building), but cannot
communicate outside of this area, it is usually because of an incorrectly configured default gateway.
Frequently Asked Questions
The Frequently Asked Questions addresses common questions regarding TDM-C504 ADSL2/2+ Modem
Router settings.
Some of these questions are also found throughout the guide, in the sections to which they reference.
1. How do I determine if a link between the Ethernet card (NIC) and the TDM-C504 ADSL2/2+
Modem Router has been established?
Ans. A ping test would determine if a connection is established between your TDM-C504 ADSL2/2+
Modem Router and computer. Using, the ping command, ping the IP address of the TDM-C504
ADSL2/2+ Modem Router, in this case, 192.168.1.1 (default). For more information on Ping Testing, refer
to Appendix C: Troubleshooting Guide. Alternatively, if the Ethernet LINK LED is solidly on, then the
Ethernet link is established.
2. How do I determine if a link between the TDM-C504 ADSL2/2+ Modem Router and the Internet has
been established?
Ans. Similar to the previous question, a ping test would determine whether or not a connection is
established. However, this time use a URL instead of and IP Address, such as www.google.com
.
Alternatively, if the ADSL LED is solidly on, then the ADSL link is established.
3. I can’t get the Internet game, server, or application to work properly.
Ans. If you are having difficulties getting any Internet game, server, or application to function properly,
consider exposing one computer to the Internet using DeMilitarized Zone (DMZ) setting. Refer to
Service–Firewall–DMZ section for the setting detail.
4. I need to upgrade the firmware.
Ans. In order to upgrade the firmware with the latest features, check with your local dealer or ISP for
technical support.
5. I forgot my password.
Ans. Reset the TDM-C504 ADSL2/2+ Modem Router to factory default by pressing the Reset button for
more than 5 seconds and then releasing it.
6. What is MAC Address?
Ans.Short for Media Access Control Address. It is a hardware address that uniquely identifies each
node of a Ethernet networking device. This address is usually permanent.
7. What is NAT (Network Address Translation) and what is it used for?
Ans.NAT translates multiple IP Address on the private LAN to one public IP Address (in WAN) that is sent
out to the Internet. NAT adds a level security since the IP address of a PC connected to the private LAN is
never transmitted on the Internet.