Chapter 9 Subscriber Port Setup Screens
Management Switch Card User’s Guide
230
DPBO 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.
Select Custom to customize breakpoints and PSD level for the PSD mask in the following
PSD chart parameter table. See Section 9.8.6 on page 236.
DPBO Type: Select which standard format (g.997.1 or t-com) to use.
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 9.2.9 on page 208 for
an explanation of electrical length.
Min DPBOESEL: This is the minimal electrical length of the cable between the CO and
Cabinet. Type the electrical length in multiples between 0~511 of 0.5 dBm.
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.
Table 100 VDSL Port Setup: Advanced
LABEL DESCRIPTION
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