ZyXEL VES1724-56B2 User Guide - Page 99

Central, CPE A, CPE B, Site CO, Line1 150m, Line2 600m, No-UPBO

Page 99 highlights

Chapter 9 VDSL Setup interference to the Line 2. CO receives signal with higher attenuation. With UPBO enabled on the CPE (A), it decreases the PSD level and reduces the crosstalk impact on long loops. Figure 51 UPBO Resolves Upstream Far-End Crosstalk CPE (B) CPE (A) No-UPBO Line2 (600m) Line1 (150m) Central Site (CO) UPBO DPBO VDSL signal may interfere with other services (such as ISDN, ADSL or ADSL2 provided by other devices) on the same bundle of lines due to downstream far-end crosstalk. DPBO (Downstream Power Back Off) can reduce performance degradation by changing the PSD level on the VDSL switch(es) at street cabinet level. 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. An example is shown next. VDSL Line 1 and ADSL Line 2 are in the same binder. Crosstalk occurs when the ADSL signal flows from CO (B) and is near to CO (A)'s ONU (Optical Network Unit) location. Besides, higher Line 1 PSD causes higher interference to the Line 2. CPE (B) receives VES1724-56 User's Guide 99

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Chapter 9 VDSL Setup
VES1724-56 User’s Guide
99
interference to the
Line 2
.
CO
receives signal with higher attenuation. With UPBO enabled on the
CPE (A)
, it decreases the PSD level and reduces the crosstalk impact on long loops.
Figure 51
UPBO Resolves Upstream Far-End Crosstalk
DPBO
VDSL signal may interfere with other services (such as ISDN, ADSL or ADSL2 provided by other
devices) on the same bundle of lines due to downstream far-end crosstalk. DPBO (Downstream
Power Back Off) can reduce performance degradation by changing the PSD level on the VDSL
switch(es) at street cabinet level.
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.
An example is shown next. VDSL
Line 1
and ADSL
Line 2
are in the same binder. Crosstalk occurs
when the ADSL signal flows from
CO (B)
and is near to
CO (A)
’s ONU (Optical Network Unit)
location. Besides, higher
Line 1
PSD causes higher interference to the
Line 2
.
CPE (B)
receives
Central
CPE (A)
CPE (B)
Site (CO)
Line1 (150m)
Line2 (600m)
No-UPBO
UPBO