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15
Field Name
Description
Synchronized Time
Time when the last synchronization was performed.
Number of Syn-
chronizations
Number of synchronizations performed.
Mode
xDSL mode that the modem has trained under, such as VDSL2+, G.DMT, etc.
Traffic Type
Connection type. Options are
ATM
,
PTM
and
ETH
.
Status
Status of the connection. Options are
Up
,
Disabled
,
NoSignal
, and
Initializing
.
Link Power State
Current link power management state (e.g., L0, L2, L3).
Downstream
and
Upstream
columns
Line Coding (Trellis)
State of the Trellis Coded Modulation. Options are
On
and
Off
.
SNR Margin (0.1 db)
Signal-to-noise ration (SNR) margin is the maximum increase (in dB) of the received noise power, such
that the modem can still meet all of the target BERs over all the frame bearers. [2]
Attenuation (0.1 db)
Signal attenuation is defined as the difference in dB between the power received at the near-end and
that transmitted from the far-end. [2]
Output Power (0.1 dBm) Transmit power from the gateway to the DSL loop relative to one Milliwatt (dBm).
Attainable Rate (Kbps)
Typical obtainable sync rate, i.e., the attainable net data rate that the receive PMS-TC and PMD func-
tions are designed to support under the following conditions:
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 paths.
l
Accounting for all coding gains available (e.g., trellis coding, RS FEC) with latency bound.
l
Accounting for the loop characteristics at the instant of measurement. [2]
Rate (Kbps)
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
and
Upstream
columns
for DSL-specific fields only
B (# of bytes in Mux Data
Frame)
Nominal number of bytes from frame bearer #n per Mux Data Frame at Reference Point A in the cur-
rent latency path.
M (# of Mux Data Frames
in FEC Data Frame
Number of Mux Data Frames per FEC Data Frame in the current latency path.
T (Mux Data Frames
over sync bytes)
Ratio of the number of Mux Data Frames to the number of sync bytes in the current latency path.
R (# of check bytes in
FEC Data Frame)
Number of Reed Solomon redundancy bytes per codeword in the current latency path. This is also the
number of redundancy bytes per FEC Data Frame in the current latency path.
S (ratio of FEC over PMD
Data Frame length)
Ratio of FEC over PMD Data Frame length.
