PEF22827EL-V11 Lantiq, PEF22827EL-V11 Datasheet - Page 64

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

Specifications of PEF22827EL-V11

• Lead Free Status / RoHS Status: Supplier Unconfirmed

•
•
Note:
1. The duration of noise pulses from which the system is protected is
2. A maximum of 24 Kbytes of memory is allocated for upstream and downstream
Table 23
Parameter
Block Length (
Depth (
Erasure Correction (
End-to-End Delay (
Memory (
4.4.1.4
After interleaving, for both upstream and downstream directions, a transmission frame is
constructed that includes all information channels (fast, slow, OC and control). The
transmission frame contains 405 bytes, a 5-byte header and a 400-byte payload, as
shown in
Preliminary Data Sheet
the same Reed Solomon code at the output of the interleaver. For all settings,
must be a multiple of the interleaver block length (
M
M
there is no interleaving. The value of
provide erasure correction for more than 500 microseconds.
E
bytes that can be corrected by the Reed Solomon algorithm during interleaving.
E
interleaving combined. Before changing interleaver parameters, make sure that
downstream plus upstream interleaving together will not require more than 24 Kbytes
of memory. See Memory (
= Erasure correction in bytes. This is the maximum number of corrupted sequential
is erasure correction in bytes, and
is any integer from 0 through 64.
= The interleaving depth index.
D
)
MEM
Figure
Construction of a Transmission Frame
Interleaver Parameters
I
)
)
6.
DL
E
) (
)
Value (in Bytes)
N
M I
M I
M I
t I N
/ 8 or
MEM
+ 1
(
(
N
) (
I
I
/ 4
) in
M I
1)
1) 2
M
Table
R
may be any integer from 0 through 64. If
is the bit rate of the transmitted signal.
64
M
1)
23.
for a given transmission profile may not
Functional Description – Digital Block
Comments
N
M
t
= 8 (RS error correction ability)
= Slow Payload (PS) + 19 bytes
is programmable to an integer 0 - 64
I
), as follows:
D M I
Rev. 1.1, 2005-01-30
E
VDSL6100i
.8 /
PEF 22827
+ 1, where
R
, where
M
D
is 0
1