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A
T
BOUT THE
IGER
VDSL can deliver high-performance online applications, such as
high-quality video and other switched multimedia services. This
Ethernet-over-VDSL system provides robust performance, with a
maximum symmetric data rate of 100 Mbps for runs up to 200 meters
(656 ft). This system is based on advanced VDSL2 Multi-Carrier
Modulation (MCM) technology with adaptive channel equalization that
overcomes bridge taps and other line distortions. Reed-Solomon Forward
Error Correction and interleaving protect against errors due to impulse
noise and enable recovery from signal interruptions. Frequency Division
Duplexing (FDD) separates downstream and upstream channels and
allows VDSL signals to coexist with regular telephone services. A power
back-off mechanism is also implemented to reduce noise from crosstalk in
line bundles.
Switch Architecture
The VDSL Switch employs a wire-speed, non-blocking switching fabric.
This permits simultaneous wire-speed transport of multiple packets at low
latency on all ports. This switch also features full-duplex capability on all
ports, which effectively doubles the bandwidth of each connection.
For communications between different VLANs, this switch uses IP
routing. For communications within the same VLAN, the switch uses
store-and-forward switching to ensure maximum data integrity. With
store-and-forward switching, the entire packet must be received into a
buffer and checked for validity before being forwarded. This prevents
errors from being propagated throughout the network.
Network Management Options
This switch contains a comprehensive array of LEDs for "at-a-glance"
monitoring of network and port status. It also includes a management
agent that allows you to configure or monitor the switch using its
embedded management software, or via SNMP applications. To manage
the switch, you can make a direct connection to the console port
(out-of-band), or you can manage the switch through a network
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WITCH
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