Chapter 9 Subscriber Port Setup Screens
Management Switch Card User’s Guide
207
9.2.5 Configured Versus Actual Rate
You configure the maximum rate of an individual VDSL port by modifying its profile (see the
VDSL
Profile Setup
screen) or assigning the port to a different profile (see the
Port Setup
screen).
However, the actual rate varies depending on factors such as transmission range and interference.
9.2.6 Impulse Noise Protection (INP)
Short impulses from external sources may cause bursts of errors which could impact the
multimedia (ex. voice, video, or picture) quality. VDSL2 supports impulse noise protection (INP)
which provides the ability to correct errors regardless of the number of errors in an errored DMT
(Discrete Multi-Tone) symbol.
9.2.7 UPBO
In a network with varying telephone wiring lengths, the PSD on each line is different. This causes
crosstalk between the lines. Enable UPBO (Upstream Power Back Off) to allow the device to adjust
the transmit PSD of all lines based on a reference line length. This mitigates the upstream crosstalk
on shorter loops to longer loops. It allows the switch to provide better service in a network
environment with telephone wiring of varying lengths.
An example is shown below.
Line 1
and
Line 2
are in the same cable binder. Crosstalk occurs when
the signal flows and is near to
CPE (A)
’s location. Besides, higher
Line 1
PSD causes higher
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 126
UPBO Resolves Upstream Far-End Crosstalk
9.2.8 DPBO
VDSL signals 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.
Central
CPE (A)
CPE (B)
Site (CO)
Line1 (150m)
Line2 (600m)
No-UPBO
UPBO
Содержание MSC1000G Series
Страница 38: ...Table of Contents Management Switch Card User s Guide 38...
Страница 39: ...39 PART I Introduction...
Страница 40: ...40...
Страница 54: ...Chapter 1 Getting to Know Your MSC Management Switch Card User s Guide 54...
Страница 61: ...61 PART II Web Configurator...
Страница 62: ...62...
Страница 80: ...Chapter 3 The Web Configurator Management Switch Card User s Guide 80...
Страница 162: ...Chapter 5 Alarm Screens Management Switch Card User s Guide 162...
Страница 178: ...Chapter 6 Diagnostic Screens Management Switch Card User s Guide 178...
Страница 184: ...Chapter 7 Maintenance Screens Management Switch Card User s Guide 184...
Страница 204: ...Chapter 8 Multicast Screens Management Switch Card User s Guide 204...
Страница 226: ...Chapter 9 Subscriber Port Setup Screens Management Switch Card User s Guide 226...
Страница 227: ...Chapter 9 Subscriber Port Setup Screens Management Switch Card User s Guide 227...
Страница 330: ...Chapter 10 IMA Screens Management Switch Card User s Guide 330...
Страница 346: ...Chapter 11 Profile Screens Management Switch Card User s Guide 346 Figure 222 Profile VDSL2 LineProfile MIB PSD Mask...
Страница 351: ...Chapter 11 Profile Screens Management Switch Card User s Guide 351 Figure 225 Profile VDSL2 LineProfile Virtual Noise...
Страница 404: ...Chapter 11 Profile Screens Management Switch Card User s Guide 404 Figure 267 ACL Profile Setup...
Страница 412: ...Chapter 11 Profile Screens Management Switch Card User s Guide 412...
Страница 451: ...Chapter 12 Statistics Screens Management Switch Card User s Guide 451 Figure 297 Port Statistics DSL Line Card Status...
Страница 512: ...Chapter 12 Statistics Screens Management Switch Card User s Guide 512...
Страница 560: ...Chapter 13 Switch Screens Management Switch Card User s Guide 560...
Страница 598: ...Chapter 15 VLAN Screens Management Switch Card User s Guide 598...
Страница 636: ...Chapter 16 VoIP Management Switch Card User s Guide 636...
Страница 638: ...Chapter 17 Config Save Management Switch Card User s Guide 638...
Страница 639: ...639 PART III Commands...
Страница 640: ...640...
Страница 646: ...Chapter 18 Commands Management Switch Card User s Guide 646...
Страница 682: ...Chapter 19 acl Commands Management Switch Card User s Guide 682...
Страница 690: ...Chapter 20 alarm Commands Management Switch Card User s Guide 690...
Страница 696: ...Chapter 22 config Commands Management Switch Card User s Guide 696...
Страница 754: ...Chapter 28 multicast Commands Management Switch Card User s Guide 754...
Страница 840: ...Chapter 29 port Commands Management Switch Card User s Guide 840...
Страница 924: ...Chapter 30 profile Commands Management Switch Card User s Guide 924...
Страница 926: ...Chapter 31 redundant Commands Management Switch Card User s Guide 926...
Страница 1062: ...Chapter 35 vlan Commands Management Switch Card User s Guide 1062...
Страница 1103: ...1103 PART IV Troubleshooting Specifications Appendices and Index...
Страница 1104: ...1104...
Страница 1134: ...Chapter 39 Product Specifications Management Switch Card User s Guide 1134...
Страница 1146: ...Appendix B Legal Information Management Switch Card User s Guide 1146...