Exfo MaxTester DSL User Manual download pdf (Page 37)

MaxTester DSL 31

DSL Parameter Details

The DSL Param Details tab displays the Downstream and Upstream parameter

results configured in the xDSL tests.

³ Line Status displays the status of the line under test

during negotiation with the DSLAM. The value

changes from Idle /Activate /Handshake /Training

/Show Time for ADSL2+ or VDSL2 mode.

³ Operation Mode is the DSL mode of operation as

negotiated between the unit and the DSLAM.

³ CO Vendor ID is a unique 4-digit alphanumeric

identifier of the DSL chipset manufacturer used on the

CO (central office) side.

³ CO Version is the version number of the unique

alphanumeric identifier of the DSL chipset used on

the CO side.

³ Sync loss count is the number of times the unit lost

synchronization.

³ Parameters - Downstream/Upstream

³ Actual Data Rate 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 SNR is the signal-to-noise ratio margin measured on the line.

³ Attenuation is line attenuation measured during the training phase.

³ 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).

³ Maximum Data Rate 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 Output Power is the current transmit power level that is a measure of the

aggregated transmit power.

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 FEC (forward error checking). The use of the

fast path means little or no delay in the delivery of data but it is more

susceptible to noise and crosstalk.

³ Interleave Delay defines the mapping (relative spacing) between

subsequent input bytes at the interleave input and their placement in the bit

stream at the interleave output.

³ INP is the level of impulse noise protection.

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Exfo MaxTester DSL User Manual Page 37

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