ZyXEL Communications MAX-200M1 Series, Руководство пользователя

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ZyXEL MAX-200M1 Series User’s Guide
Appendix A 217
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.
Multiple PVC (Permanent
Virtual Circuits) Support
Your device supports up to 8 Permanent Virtual Circuits (PVCs).
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.
REN A Ringer Equivalence Number (REN) is used to determine the number
of devices (like telephones or fax machines) that may be connected to
the telephone line. Your device has a REN of three, so it can support
three devices per telephone port.
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. 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, 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.
This allows the device to tag voice frames so they can be prioritized
over the network.
Packet Filters Your device’s packet filtering function allows added network security
and management.
Table 94 Non-Physical Features
FEATURE DESCRIPTION