Allied Telesis AT-MC606 User Manual

AT-MC606 VDSL Network Extender Installation Guide

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

Figure 4. VDSL Configuration DIP Switches

The SCBR/PROV (Left) switch defines the function of the AT-MC606 as 
either a Subscriber or a Provider unit. The Subscriber (SCBR) position is 
selected when the AT-MC606 is used at the end point of the coaxial VDSL 
line where the Ethernet lines are distributed to the end-user. The Provider 
(PROV) position is selected when the AT-MC606 is used as the source for 
the coaxial VDSL line. Normally, two AT-MC606’s work together in tandem 
- one as a Subscriber unit and the other as a Provider unit.

The FAST/INTL (Left Center) switch is used when noise compensation is 
required. If the coaxial 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.

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