Allied Telesis AT-MC605 - Manual (Page 25)

AT-MC605 VDSL Ethernet Extender Installation Guide
25
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 LIMIT FAST SCBR 6dB
RATE LIMIT INTL PROV 9dB
VDSL CONFIG