Chapter 21 Product Specifications
User’s Guide 239
Content Filtering The WiMAX Modem can block access to web sites containing
specified keywords. You can define time periods and days
during which content filtering is enabled and include or
exclude a range of users on the LAN from content filtering.
Network Address
Translation (NAT) Network Address Translation (NAT) allows the translation of
an Internet protocol address used within one network (for
example a private IP address used in a local network) to a
different IP address known within another network (for
example a public IP address used on the Internet).
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.
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.
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.
Multiple SIP Accounts You can configure multiple voice (SIP) accounts.
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).
Dynamic Jitter Buffer The built-in adaptive buffer helps to smooth out the
variations in delay (jitter) for voice traffic (up to 60 ms). This
helps ensure good voice quality for your conversations.
Voice Activity Detection/
Silence Suppression Voice Activity Detection (VAD) reduces the bandwidth that a
call uses by not transmitting when you are not speaking.
Comfort Noise Generation Your device generates background noise to fill moments of
silence when the other device in a call stops transmitting
because the other party is not speaking (as total silence
could easily be mistaken for a lost connection).
Echo Cancellation You device supports G.168 of at least 24 ms.
This an ITU-T standard for eliminating the echo caused by the
sound of your voice reverberating in the telephone receiver
while you talk.
Table 104 Firmware Specifications (continued)FEATURE DESCRIPTION