Chapter 1 VLC Overview

Alarm LED

An ALM (alarm) LED lights when the VLC 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.

CFM

The IEEE 802.1ag Connectivity Fault Management (CFM) specification allows network administrators to identify and manage connection faults. Through discovery and verification of the path, CFM can detect, analyze and isolate connectivity faults in bridged LANs. This is especially helpful when the route between a CO VDSL switch and one of its CPE goes through switches owned by independent organizations.

IEEE 802.1Q Tagged VLAN

Your VLC uses the IEEE 802.1Q Tagged VLAN (Virtual Local Area Network), which allows it to deliver tagged/untagged frames to and from its ports.

Subnet Based VLAN

Subnet based VLAN allows you to group traffic into logical VLANs based on the source IP subnet you specify. When a frame is received on a port, the VLC checks if a tag is added already and the IP subnet it came from. The untagged packets from the same IP subnet are then placed in the same subnet based VLAN. One advantage of using subnet based VLANs is that priority can be assigned to traffic from the same IP subnet.

xVLAN

xVLAN translates (changes) the VLAN IDs (VIDs) of subscriber traffic before sending it to the service provider’s network. This lets you use unique VLANs for each subscriber but still deploy all the CPE devices with the same VLAN configuration. xVLAN also supports translating single-tagged frames to double-tagged frames.

Port Isolation

The VLC's port isolation feature allows each port to communicate with the uplink port but not communicate with each other.

Isolation (per-VLAN)

Use isolation to block the VDSL2 subscribers in a specific VLAN from sending traffic directly to each other.

IEEE 802.1x Port-based Authentication

The VLC supports the IEEE 802.1x standard for centralized user authentication and accounting management through an optional network authentication (RADIUS) server.

Packet Filter

The VLC supports packet filtering based on protocol. You can configure the VLC to accept all packets, accept PPPoE packets only or block any combination of the following protocols: IP, ARP, DHCP, EAPOL, PPPoE, NetBios or IGMP.

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VLC1324G User’s Guide