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AT-MC605 VDSL Ethernet Extender Installation Guide

The front panel VDSL Configuration DIP switches are shown in Figure 4

Figure 4. VDSL Configuration DIP Switches

VDSL

Configuration

DIP Switch

Descriptions

SCBR/PROV VDSL Configuration Switch

The SCBR/PROV (Left) switch defines the function of the AT-MC605

Ethernet Extender as either a Subscriber or a Provider unit. The

Subscriber (SCBR) position is selected when the AT-MC605 Ethernet

Extender is used at the end point of the VDSL line where the ethernet and

phone lines are distributed to the end-user. The Provider (PROV) position

is selected when the AT-MC605 Ethernet Extender is used as the source

for the VDSL line. Normally, two AT-MC605 Ethernet Extenders work

together in tandem - one as a Subscriber unit and the other as a Provider

unit.

FAST/INTL VDSL Configuration Switch

The FAST/INTL (Left Center) switch is used when noise compensation is

required. If the VDSL line is operating in a relatively low noise

environment, the data link and data transmission are usually reliable. The

FAST position is recommended in this case. This operating mode has the

advantage of short latency times - usually less than 1 ms.

You will want to select the INTL (Interleaved) position if you notice that the

VDSL link is being repeatedly dropped or data is being lost, excessive

noise bursts on the line may be the cause. With the Interleaved selection,

the transmitted data is combined or interleaved with data correction code.

This combination reduces the data errors, packet losses and loss of sync

caused by a noisy environment. However, because the additional data

correction code is added to the data stream, the overall transmission

latency will increase and is usually less than 6 ms. The overall effect of this

setting is more reliable data transmissions in a noisy environment.

1590

NO LIMITFASTSCBR

6dB

RATE LIMIT

INTL

PROV

9dB

VDSL CONFIG

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Allied-telesis AT-MC605 User Manual Page 25