EXFO FTB-635 Wideband Copper and DSL Test Module - Manual (Page 328)

xDSL Test Results
320 FTB-635
Summary

Operation Mode is the xDSL mode of operation, bonded or
non-bonded, as negotiated between the unit and the DSLAM.

Transport Type displays the transport type options: PTM (packet
transfer mode) or ATM (asynchronous transfer mode).

Downstream and Upstream parameters:

Max Data Rate (Mbit/s) displays the maximum attainable bit rates
that the circuit can handle as determined by the remote terminal
and CO during the training phase. Values are typically greater than
the actual bit rate.

Act. Data Rate (Mbit/s) displays the provisioned data rate for
which the unit and CO are connected. This normally corresponds
to the service product sold to the subscriber, as negotiated during
the training phase. The rate may be lower if the loop is faulted or
subjected to high levels of noise/crosstalk.

SNR (dB) is a value ranging from 0 through 63.5 for the existing
SNR (signal-to-noise ratio) margin: 6 - 8 dB is typical for internet
connections, while 12 dB and above is typical for IPTV/video
circuits.

Line attenuation (dB) is the attenuation measured on the line
during the training phase.

Capacity (%) is the capacity of the line as a ratio of achieved bit
rate over the maximum attainable bit rate presented as a
percentage (%). A high value could mean that the link is nearing its
maximum capabilities while a low value could mean the link is
being under utilized (sometimes intentionally – verify your local
DSLAM setup).

Downstream/Upstream Act. Data Rate (Mbit/s) bit rates are displayed
by graphic speed dials and the current actual values appear as
numbers.