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Page 41 / 427 Scroll up to view Page 36 - 40
P-2602H(W)(L)-DxA Series User’s Guide
Chapter 1 Getting To Know the ZyXEL Device
41
Echo Cancellation
You device supports G.168, an ITU-T standard for eliminating the echo caused by the sound
of your voice reverberating in the telephone receiver while you talk.
QoS (Quality of Service)
Quality of Service (QoS) mechanisms help to provide better service on a per-flow basis. Your
device supports Type of Service (ToS) tagging and Differentiated Services (DiffServ) tagging.
This allows the device to tag voice frames so they can be prioritized over the network.
SIP ALG
Your device is a SIP Application Layer Gateway (ALG). It allows VoIP calls to pass through
NAT for devices behind it (such as a SIP-based VoIP software application on a computer).
Universal Plug and Play (UPnP)
Your device and other UPnP enabled devices can use the standard TCP/IP protocol to
dynamically join a network, obtain an IP address and convey their capabilities to each other.
PPPoE Support (RFC2516)
PPPoE (Point-to-Point Protocol over Ethernet) emulates a dial-up connection. It allows your
ISP to use their existing network configuration with newer broadband technologies such as
ADSL. The PPPoE driver on your device is transparent to the computers on the LAN, which
see only Ethernet and are not aware of PPPoE thus saving you from having to manage PPPoE
clients on individual computers.
Other PPPoE Features
•
PPPoE idle time out
•
PPPoE dial on demand
Dynamic DNS Support
With Dynamic DNS support, you can have a static hostname alias for a dynamic IP address,
allowing the host to be more easily accessible from various locations on the Internet. You must
register for this service with a Dynamic DNS service provider.
DHCP
DHCP (Dynamic Host Configuration Protocol) allows the individual clients (computers) to
obtain the TCP/IP configuration at start-up from a centralized DHCP server. Your device has
built-in DHCP server capability enabled by default. It can assign IP addresses, an IP default
gateway and DNS servers to DHCP clients. Your device can also act as a surrogate DHCP
server (DHCP Relay) where it relays IP address assignment from the actual real DHCP server
to the clients.
Page 42 / 427
P-2602H(W)(L)-DxA Series User’s Guide
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Chapter 1 Getting To Know the ZyXEL Device
Multiple PVC (Permanent Virtual Circuits) Support
Your device supports up to 8 Permanent Virtual Circuits (PVC’s).
IP Alias
IP alias allows you to partition a physical network into logical networks over the same
Ethernet interface. Your device supports three logical LAN interfaces via its single physical
Ethernet interface with the your device itself as the gateway for each LAN network.
IP Policy Routing (IPPR)
Traditionally, routing is based on the destination address only and the router takes the shortest
path to forward a packet.
IP Policy Routing (IPPR) provides a mechanism to override the
default routing behavior and alter the packet forwarding based on the policy defined by the
network administrator.
Packet Filters
Your device’s packet filtering function allows added network security and management.
Ease of Installation
Your device is designed for quick, intuitive and easy installation.
Housing
Your device's compact and ventilated housing minimizes space requirements, making it easy
to position anywhere in your busy office.
1.3
Wireless Features (“W” models only)
IEEE 802.11g Wireless LAN
IEEE 802.11g is fully compatible with the IEEE 802.11b standard.
This means an IEEE
802.11b radio card can interface directly with an IEEE 802.11g access point (and vice versa)
at 11 Mbps or lower depending on range. IEEE 802.11g has several intermediate rate steps
between the maximum and minimum data rates. The IEEE 802.11g data rate and modulation
are as follows:
Table 3
IEEE 802.11g
DATA RATE (MBPS)
MODULATION
1
DBPSK (Differential Binary Phase Shift Keyed)
2
DQPSK (Differential Quadrature Phase Shift Keying
)
Page 43 / 427
P-2602H(W)(L)-DxA Series User’s Guide
Chapter 1 Getting To Know the ZyXEL Device
43
Note:
Your device may be prone to RF (Radio Frequency) interference from other 2.4
GHz devices such as microwave ovens, wireless phones, Bluetooth enabled
devices, and other wireless LANs.
IEEE 802.11g+ Wireless LAN
Your device supports IEEE 802.11g+ to allow any ZyXEL WLAN devices that also support
IEEE 802.1g+ to associate with the ZyXEL Device at higher transmission speeds than with
standard IEEE 802.11g.
External Antenna
The ZyXEL Device is equipped with an attached antenna to provide a clear radio signal
between the wireless stations and the access points.
Wireless LAN MAC Address Filtering
Your device can check the MAC addresses of wireless stations against a list of allowed or
denied MAC addresses.
WEP Encryption
WEP (Wired Equivalent Privacy) encrypts data frames before transmitting over the wireless
network to help keep network communications private.
Wi-Fi Protected Access
Wi-Fi Protected Access (WPA) is a subset of the IEEE 802.11i security standard. Key
differences between WPA and WEP are user authentication and improved data encryption.
WPA2
WPA 2 (IEEE 802.11i) is a wireless security standard that defines stronger encryption,
authentication and key management than WPA.
WMM QoS
WMM (Wi-Fi MultiMedia) QoS (Quality of Service) allows you to prioritize wireless traffic
according to the delivery requirements of individual services.
5.5 / 11
CCK (Complementary Code Keying)
6/9/12/18/24/36/48/54
OFDM (Orthogonal Frequency Division Multiplexing)
Table 3
IEEE 802.11g
DATA RATE (MBPS)
MODULATION
Page 44 / 427
P-2602H(W)(L)-DxA Series User’s Guide
44
Chapter 1 Getting To Know the ZyXEL Device
1.4
Applications for the ZyXEL Device
Here are some example uses for which the ZyXEL Device is well suited.
1.4.1
Internet Access
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
1.4.1.1
Internet Single User Account
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
1.4.2
Making Calls via Internet Telephony Service Provider
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.
Page 45 / 427
P-2602H(W)(L)-DxA Series User’s Guide
Chapter 1 Getting To Know the ZyXEL Device
45
Figure 2
Internet Telephony Service Provider Application
1.4.3
Make Peer-to-peer Calls
You can call directly to someone’s IP address without using a SIP proxy server. Peer-to-peer
calls are also called “Point to Point” or “IP-to-IP” calls. You must know the peer’s IP address
in order to do this.
The following figure shows a basic example of how you would make a peer-to-peer VoIP call.
You use your analog phone (A in the figure) and your device (B) changes the call into VoIP.
and sends the call through the Internet to the peer VoIP device (C).
Figure 3
Peer-to-peer Calling
1.4.4
Firewall for Secure Broadband Internet Access
Your device provides protection from attacks by Internet hackers. By default, the firewall
blocks all incoming traffic from the WAN. The firewall supports TCP/UDP inspection and
DoS (Denial of Services) detection and prevention, as well as real time alerts, reports and logs.

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