ZyXEL Communications MSC1000G Series, User Manual, Page: 206 / 1168

Chapter 9 Subscriber Port Setup Screens
Management Switch Card User’s Guide
206
9.2.3 Frequency Band Plan
Each VDSL mode operates in a different frequency band allocation, resulting in different upstream
and downstream speeds. Your system automatically changes the band plan based on the loop
condition and loop length.
A band plan example is shown next. Band plans include an optional band (between 25 kHz and 276
kHz) controlled by “limit PSD mask”.
The optional band is used for upstream transmission which is to be negotiated during line initiation.
The optional band frequency (for example,
x and y ) varies depending on the limit PSD mask you
use.
Figure 125
A Band Plan Example
A sample of optional band PSD masks and associated frequency bands used in the Device is shown
next.
The “eu” number in the limit PSD mask is a tone index. A tone spacing, 4.3125 kHz, is used for
VDSL2 profile from 8a up to 17a. So “eu32” means the optional band ending at around 138 kHz.
See
Section 9.8.4 on page 234 for a list of PSD masks.
9.2.4 VDSL2 Profiles
The following table lists the supported Annex A VDSL2 profiles defined by the VDSL standard. Refer
to the ITU G.993.2 specifications for more information on other profiles. The VDSL2 profiles
available in an individual VDSL2 line card varies.
Table 88
Optional band PSD Mask
LIMIT PSD MASK OPTIONAL BAND FREQUENCY
nus0_d32 = No optional band
eu32_d32 = 25 ~ 138 kHz
eu36_d48 = 25 ~ 155.25 kHz
. . .
US1
US2 US0 DS1 DS2
Frequency
12
(MHz)
x
y
3.75 5.2
8.5
Table 89
Supported VDSL2 Profiles (Annex A)
PROFILE 8A 8B 8C 8D 12A 12B 17A 30A
Bandwidth (MHz) 8.5 8.5 8.5 8.5 8.5 8.5 17.66 30
Tone 1972 1972 1972 1972 1972 1972 4096 4096
Tone Spacing (kHz) 4.3125 4.3125 4.3125 4.3125 4.3125 4.3125 4.3125 4.3125
Line Power (dBm) +17.5 +20.5 +11.5 +14.5 +14.5 +14.5 +14.5 +14.5