PEF22827EL-V11 Lantiq, PEF22827EL-V11 Datasheet - Page 122

• Manufacturer Part Number: PEF22827EL-V11
• Manufacturer: Lantiq

Specifications of PEF22827EL-V11

• Lead Free Status / RoHS Status: Supplier Unconfirmed

If Long Range is enabled, the RA process may automatically choose to use US0 (0.25-
0.138).
7.6.7.6
The Power Back Off (PBO) mechanism computes transmission power at the NT (CPE)
for each upstream carrier, according to line conditions. PBO may be activated whenever
a link is established, if the RA process is not active.
To ensure consistent results, the RA process freezes the PBO mechanism and uses only
the first set of PBO results. Whenever distances are changed, it may be necessary to
unfreeze the PBO mechanism before running the RA process again.
To ensure new PBO computation do the following:
1. Disable RA at the CPE. (Clear bit
2. Deactivate and reactivate the link.
7.6.7.7
The RA process automatically implements Long Reach VDSL (LR-VDSL) mode (if it is
enabled on both ends) to support operation at distances greater than 1300 m.
To enable automatic implementation of LR-VDSL by the RA process, do the following:
1. Enable Long Reach at the Remote Modem - At the NT, activate the LR_EN bit (set
2. Disable DF_STP0 - Set the
3. Use DF_STP2 Values - At both the LT and the NT, replace the values of the
4. Enable Long Reach at the Local Modem - At the LT, activate the LR_EN bit (set bit
For more information refer to the application notes that describe the Rate Adaptive
process and Long Reach VDSL (LR-VDSL) mode.
Preliminary Data Sheet
symbol rate, or:
((F
bit 7 of the
depending on the bank used). Set this bit at the NT only once, after the first firmware
download, if upstream channel 0 filters and long reach capabiilty are both present.
Never turn it off. Downloading new firmware using the API preserves the previous
value.
8F02
recommended to use DF0_SKIP mode. DF_STP0 is the standard short range default
STP. In DF0_SKIP mode, only DF_STP1 and DF_STP2 are the alternating STPs.
DF_STP1 parameters with the default values for the DF_STP2 parameters (long
reach support) shown in
DF_STP2 parameters, see also
7 of the
LOW_BAND2
H
) to 1 in both the LT and the NT. When long reach VDSL is enabled, it is
Running the RA Process with PBO in Changing Conditions
Running the RA Process with Long Reach VDSL
LINK_MODE
LINK_MODE
F
LOW_BAND1
register at 8F02
Table 32 on page
) mod 4) = 0 where, F
register to 1 at the EEPROM, address 8F02
DF0_SKIP
Table 30 on page
RA_EN
H
122
to 1).
bit (bit 5 in the
to 0
96. For descriptions of DF_STP1 and
B
.)
LOW_BANDx
92.
Operation – Digital Block
= CF
LINK_MODE
BANDx
Rev. 1.1, 2005-01-30
VDSL6100i
SR
PEF 22827
H
register at
BANDx
or F802
H
,