21
7
㧚
SERIAL AND TELNET SETTING
LIST OF SERIAL AND TELNET SETTING ITEMS
SE
RIA
LA
ND
TE
LN
ET
SE
TT
ING
7
Setting Item
Notch Filter Setting
Power Back-off Setting
VDSL Send-out Level
Control Setting
Check VDSL Setting
Port Reset
٨
If the Equipment is installed near an amateur radio apparatus,
radiation noise from the VDSL circuit cable may affect amateur
radio communication. Setting Notch Filter = Valid allows you
to leave a part of the working frequency band of the VDSL
circuit unused.
This may reduce an effect on amateur radio communication.
٨
Notch Filter can be set, dividing the VDSL working frequency
into 4 bands. For Notch Filter, set an effective frequency band,
depending on the working environment.
٨
Setting Notch Filter = Valid may slows down or shortens the
transmission speed or transmission distance, because the
working frequency band of the VDSL circuit is partly left
unused. The following lists the transmission speed and
transmission distance when Notch Filter is Valid.
The transmission speed differs depending on the installation
environment. The following lists the reference values when all
the VDSL circuit ports are wired to the identical UTP cable.
Notch Filter setting is the case where all the frequency bands
have been set to Invalid/Valid. Other VDSL settings are all
initial values.
Description
Page
㧙
㧙
㧙
㧙
㧙
Transmission
Distance
㧔
m
㧕
100
300
500
700
900
45.1/27.0
45.1/24.6
42.6/18.8
30.1/5.7
20.2/4.8
Transmission Speed
㧔
Mbps
㧕
NotchFilter
㧦
Invalid NotchFilter
㧦
Valid
39.0/18.8
34.0/18.8
28.9/14.4
18.8/5.0
٨
Power back-off is a function to control the VDSL send-out level
in order to reduce a cross talk between the cables of the VDSL
circuit. The VDSL send-out level and S/N ratio are calculated
as parameters to automatically set the send-out level
according to its transmission speed and transmission
distance.
٨
If power back-off is Valid, the transmission speed may slow
down in order to control the VDSL send-out level. It has been
initially set to
㨬
Valid (UP)
㨭
(UP: In the direction from single unit
type to concentrated type).
٨
If the S/N ratio of the VDSL port is unstable, an inter-cable
cross talk between the VDSL ports is possibly affecting it.
The send-out level may be attenuated to 0 to 20 dB.
٨
Set an attenuation value to an optimum one depending on the
installation environment.
٨
Note that attenuating the VDSL send-out level may slow down
the transmission speed.
٨
When controlling the VDSL send-out level, set Power Back-off
Setting =
ޟ
Invalid.
ޠ
VDSL Send-out Level Control Setting is
not reflected if you set Power Back-off Setting =
ޟ
Valid.
ޠ
Allows you to check the VDSL setting data.
Allows you to reset the specified VDSL circuit port if a VDSL
port link is unstable.
16.4/3.6
