EXFO VDSL2 - Manual (Page 216)

Data Analysis
208 AXS-200/635
Reading Results
³
Parameter lists the DownStream and UpStream results for the
following parameters:
³
Max BitRate displays the maximum attainable bit rates that the
circuit can handle as determined by the remote terminal and CO
during the training phase. Values can be greater than the actual bit
rate.
³
Actual BitRate displays the values at which the unit and CO are
connected, as negotiated during the training phase. The values
should represent what the CO was set to, unless the DSL link is
being subjected to high levels of noise/crosstalk, and are typically
what the DSLAM has been set to, whether interleaved or fast.
³
Capacity is the capacity of the line as a ratio of achieved bit rate
over the maximum attainable bit rate (Max BitRate) 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).
³
Latency is the path type, Fast or Interleave, set by the service
provider at the CO. The use of the interleaved path means greater
delay in the delivery of data but it is less susceptible to noise or
crosstalk due to increased Reed-Solomon coding and forward
error checking (FEC). The use of the fast path means little of no
delay in the delivery of data but it is more susceptible to noise and
crosstalk.
When set up over Ethernet, the available test results are the following:
³
Line Status displays either Connected or Disconnected for the
particular line connection under test.
³
LinkSpeed is a choice between AUTO (negotiated during the link
establishment), 100 or 10 Mbps.
³
ConnectMode is FULL_DUP or HALF_DUP, when Link Speed is set to
either 100 or 10 Mbps.