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Field Name
Description
Output Power (0.1 Bm)
Transmit power from the gateway to the DSL loop relative to one Milliwatt (dBm).
Attainable Rate (Kbps)
The typically obtainable sync rate, i.e., the attainable net data rate that the receive
PMS-TC and PMD functions are designed to support under the following conditions:
Rate (Kbps)
The current net data rate of the xDSL link. Net data rate is defined as the sum of all
frame bearer data rates over all latency paths. [2]
Downstream
Upstream
and
columns for DSL-specific fields only
B (# of bytes in Mux Data
The nominal number of bytes from frame bearer #n per Mux Data Frame at Reference
Frame)
Point A in the current latency path.
M (# of Mux Data Frames in
The number of Mux Data Frames per FEC Data Frame in the current latency path.
FEC Data Frame
T (Mux Data Frames over
The ratio of the number of Mux Data Frames to the number of sync bytes in the current
sync bytes)
latency path.
R (# of check bytes in FEC
The number of Reed Solomon redundancy bytes per codeword in the current latency
Data Frame)
path. This is also the number of redundancy bytes per FEC Data Frame in the current
latency path.
S (ratio of FEC over PMD
The ratio of FEC over PMD Data Frame length.
Data Frame length)
L (# of bits in PMD Data
The number of bits from the latency path included per PMD.
Frame)
D (interleaver depth)
The interleaving depth in the current latency path, used to manager error correction.
I (interleaver block size in
The block sizeused for interleaving data transmissions.
bytes)
N (RS codeword size)
The size of the Reed-Solomon (RS) codeword used for managing error correction.
Delay (msec)
The PMS-TC delay in milliseconds of the current latency path (or the lowest latency
path when running dual-latency paths).
INP (DMT symbol)
The input level for DMT-managed DSL environments.
(End of DSL-specific field group)
Super Frames
The number of xDSL OH Frames transmitted/received.
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Accounting for all coding gains available (e.g., trellis coding, RS FEC) with
l
latency bound
Accounting for the loop characteristics at the instant of measurement [2]
l
Single frame bearer and single latency operation
l
Signal-to-Noise Ratio Margin (SNRM) to be equal or above the SNR Target Margin
l
BER not to exceed the highest BER configured for one (or more) latency paths
l
Latency not to exceed the highest latency configured for one (or more) latency
l
paths
Accounting for all coding gains available (e.g., trellis coding, RS FEC) with
l
latency bound
Accounting for the loop characteristics at the instant of measurement [2]
l
15
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