ZyXEL Communications P-2602R-DxA Series User Manual

P-2602R/RL-DxA Series User’s Guide

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Chapter 1 Getting To Know the ZyXEL Device

Here are some example uses for which the ZyXEL Device is well suited.

Your device is the ideal high-speed Internet access solution. It supports the TCP/IP protocol, 
which the Internet uses exclusively. It is compatible with all major ADSL DSLAM (Digital 
Subscriber Line Access Multiplexer) providers.  A DSLAM is a rack of ADSL line cards with 
data multiplexed into a backbone network interface/connection (for example, T1, OC3, DS3, 
ATM or Frame Relay). Think of it as the equivalent of a modem rack for ADSL. In addition, 
your device allows wireless clients access to your network resources and the Internet. A 
typical Internet access application is shown below.

Figure 1   Internet Access Application

For a SOHO (Small Office/Home Office) environment, your device offers the Single User 
Account (SUA) feature that allows multiple users on the LAN (Local Area Network) to access 
the Internet concurrently for the cost of a single IP address

In a home or small office environment, you can use your device to make and receive VoIP 
telephone calls through an Internet Telephony Service Provider (ITSP). 
The following figure shows a basic example of how you would make a VoIP call through an 
ITSP. You use your analog phone (A in the figure) and your device (B) changes the call into 
VoIP. Your device then sends your call to the Internet and the ITSP’s SIP server. The VoIP 
call server forwards calls to PSTN phones (E) through a trunking gateway (D) to the PSTN 
network. The VoIP call server forwards calls to IP phones (F) through the Internet.