PEF22827EL-V11 Lantiq, PEF22827EL-V11 Datasheet - Page 123

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

Specifications of PEF22827EL-V11

• Lead Free Status / RoHS Status: Supplier Unconfirmed

To implement Long Reach VDSL without running the RA process, see,
Long Reach VDSL Manually” on Page
7.6.8
LR-VDSL operation mode operates only on one upstream band. On this band, only the
constellation can be configured via the relevant STP (CR_STP or WS_STP). All other
parameters are fixed by firmware and cannot be modified.
The Rate Adaptive process can automatically implement Long Reach VDSL (LR-VDSL)
mode to support operation at distances greater than 1,300 m, as described in ,
“Running the RA Process with Long Reach VDSL” on Page
To manually implement LR-VDSL mode without running the RA process, do the
following:
1. Set the Frequency - Make sure the crystal frequency at the LT is 25.92 MHz.
2. Enable Long Reach at Both LT and NT - Make sure that in both the LT and the NT,
3. Set STP Values - Send VOCs to set Upstream 1 (US1), with both Center Frequency
For more information refer to the application notes that describe the Rate Adaptive
process and Long Reach VDSL (LR-VDSL) mode.
7.6.9
Registers in the remote NT can be accessed from the LT using the following registers:
•
•
•
•
To read a byte from the remote NT, do the following at the LT:
1. Write the address of the remote register to read, into the VOC_DAT register.
2. Write 93
3. Write 40
4. Read VOC_OC, and wait for it to change from 00
5. Read the GEN_STATUS2 register. If the CF (bit 2) is set to 1, the operation
Preliminary Data Sheet
the LR_EN bit (bit 7 of the
the NT, LR_EN bit is always set to 1.
(CF) and Symbol Rate (SR) parameters in the approriate STP to 1.
It is recommended to replace the values of the DF_STP1 parameters with the default
values for the DF_STP2 parameters (long reach support) shown in
page
Table 30 on page
“VOC_CNTL” on Page 189
“VOC_OC” on Page 190
“VOC_DAT” on Page 190
“GEN_STATUS2” on Page 198
data fields see
succeeded and the low byte of the VOC_DAT register contains the information read,
where the low byte is at address 8F07
96. For descriptions of DF_STP1 and DF_STP2 parameters, see also
Implementing Long Reach VDSL Manually
Accessing the Remote Transceiver
H
H
to the VOC_OC register. For detailed descriptions of opcodes and related
to the VOC_CNTL register.
Table 70 “Access to Remote Registers” on Page
92.
(8F05
LINK_MODE
(8F06
(8F04
H
(8F10
)
H
:8F07
H
)
H
123.
. If UTCF (bit 3) is set to 1, the operation failed.
123
H
)
H
register) is set to 1. It is recomended that in
)
H
to opcode 93
Operation – Digital Block
122.
H
Rev. 1.1, 2005-01-30
.
“Implementing
194.
VDSL6100i
Table 32 on
PEF 22827