ZyXEL Communications SLC1224, Руководство пользователя

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SLC1224 User’s Guide
22 Chapter 1 SLC1224 Overview
Alarm LED
An ALM (alarm) LED lights when the SLC is overheated or the voltage readings are outside
the tolerance levels and turns off when the temperature or voltage has returned to a normal
level. Fans in the main chassis cool the unit.
N-wire Mode
The n-wire mode allows you to physically bundle two or four G.SHDSL ports into a single 4-
wire or 8-wire G.SHDSL connection. This can increase the reach of G.SHDSL or give
increased bandwidth when connecting to 4-wire mode G.SHDSL modems or another SLC.
IEEE 802.1Q Tagged VLAN
Your SLC uses the IEEE 802.1Q Tagged VLAN (Virtual Local Area Network), which allows
it to deliver tagged/untagged frames to and from its ports. The SLC supports up to 4094
individual VLANs.
IEEE 802.1x Port-based Authentication
The SLC supports the IEEE 802.1x standard for centralized user authentication and
accounting management through an optional network authentication (RADIUS) server.
MAC (Media Access Control) Count Filter
You can limit the number of MAC addresses that may be dynamically learned on a port. You
may enable/disable the MAC count filter on individual ports.
System Error Logging
The SLC's system error log will record error logs locally. These logs may be viewed again
after a warm restart.
IGMP Snooping
With IGMP snooping, group multicast traffic is only forwarded to ports that are members of
that group. IGMP snooping generates no additional network traffic, allowing you to
significantly reduce multicast traffic passing through your SLC.
Multiple PVC
The SLC allows you to use different channels (also called Permanent Virtual Circuits or
PVCs) for different services or subscribers. You can define up to four channels on each DSL
port and use them for different services or levels of service. You set the default port VID that
is assigned to untagged frames received on each channel. You also set an IEEE 802.1p priority
for each PVC. In this way you can assign different priorities to different channels (and
consequently the services that get carried on them or the subscribers that use them).