ZyXEL Communications MSC1024G Series User Manual page 230

Chapter 11 Subscriber Port Setup Screens
Table 86 VDSL Port Setup: Advanced
LABEL
UPBO
DPBO
230
DESCRIPTION
UPBO (Upstream Power Back Off) allows the switch to provide better service in a
network environment with telephone wiring of varying lengths.
Select Enable to activate this feature.
Select Disable to deactivate this feature.
Type the UPBOSEL (Upstream Power Back-off Exchange-Side Electrical Length)
to specify the electrical length of the cable between CPE and CO.
Set this to 0~127 (in 0.1 dB) to force CPE devices to use the Device's electrical
length value for UPBO adjustment.
Set this to -1 to use a dynamic electrical length based on the result of the
negotiation between the Device and CPE devices.
For Bands 1~3 specify 4000~8095 (0.01 dBm/Hz) for parameter A which defines
the original band shape. Specify 0~4095 (0.01 dBm/Hz) for parameter B which
defines the power back-off degree. Parameter A and B are used for UPBO PSD
mask calculations.
DPBO (Downstream Power Back Off) allows the switch to provide better service in
a network environment with telephone wiring of varying lengths.
Select Enable to avoid interference with other services (such as ISDN, ADSL or
ADSL2 provided by other devices) on the same bundle of lines. ISDN in Europe
uses a frequency range of up to 80 kHz, while ISDN in Japan uses a frequency
range of up to 640 kHz. ADSL utilizes the 1.1 MHz band. Both ADSL2 and ADSL
2+ utilize the 2.2 MHz band.
Select Disable to deactivate this feature.
DPBOEPSD (Downstream Power Back Off assumed Exchange PSD Mask) is a
pre-defined PSD mask to reduce interference with other services (for example,
ADSL) in the same copper bundle.
psd_co: Select this if the Device is deployed at the CO and you want it to use the
full ADSL band.
psd_flat: Select this to have the Device not use the ADSL band.
psd_cab_ansi: Select this if the Device is deployed in a cabinet and has to co-
exist with other services in region A.
psd_cab_etsi: Select this if the Device is deployed in a cabinet and has to co-
exist with other services in region B.
psd_exch_etsi: Select this if the Device is deployed in an exchange and has to
co-exist with other services in region B.
psd_exch_ansi: Select this if the Device is deployed in an exchange and has to
co-exist with other services in region A.
Click Custom to display a screen where you can customize breakpoints and PSD
level for the PSD mask. See
DPBOESEL: This is the electrical length of the cable between the CO and
Cabinet. Type the electrical length in multiples between 0~511 of 0.5 dBm. See
Section 11.2.9 on page 212
DPBOESCMA, DPBOESCMB, DPBOESCMC: These are parameters in a cable
model that is used to describe signal loss at an insertion point of a DSL line (such
as a cabinet) on a bundled DSL connection between the CO and CPE.
DPBOMUS: This is the assumed minimum usable PSD mask of exchange signals
at remote site (in dBm/Hz), used to modify parameter DPBOFMAX defined below.
DPBOFMIN: This is the minimum frequency at which DPBO may be applied.
DPBOFMAX: This is the maximum frequency at which DPBO may be applied.
Note: For more information on these values, see the ITU G. 993.2
specifications.
Section 11.8.5 on page 235.
for an explanation of electrical length.
MSC1000G/1024G/1224G Series User's Guide