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Bandwidth on each line can vary depending on many factors including electrical noise, crosstalk

and wire type. Motorola customer support can provide detailed assistance in fine-tuning

parameters for maximum performance. The following steps will suffice in most cases.

T3 PowerBroadband and XLP-7000

Cmd: show interface dsl status

Excessive Crosstalk Crosstalk is caused by low twist wire pairs. Crosstalk effects can be

seen by an extreme delta between performances on adjacent lines. For

example, one line links with 50Mbps while the other line links at 25Mbps.

Crosstalk can also be indicated if the CF value of adjacent lines is not

the same.

What to do Check the CF value of DS1 and DS2, as these bands are most affected

by crosstalk. If the CF values differ, then lower the target line rate to less

than 38Mbps and check the lines again after relink. Send the output of

the command to Motorola Customer Support for further assistance.

Increase the target SNR Margin using the command, interface dsl config

port(1-25) margin 9.

Make sure the termination blocks have UTP wiring on the backside.

Common telephony blocks often use untwisted wires to build the

termination blocks. Make sure the RJ21 Amphenol cables use twisted

wire pairs in their construction.

Bit Errors Bit errors on the wire are reported as a line quality measurement. If you

suspect high bit errors, set the quality threshold to the minimum. Bit

error threshold traps will be sent to the SNMP management station and

can be viewed from the CLI or webUI, as Fair Quality.

What to do use the command interface dsl threshold minimum .5 maximum 1 to set

the threshold to the lowest possible. At this level, single bit errors of 1

every 2 seconds will be trapped and reported.

Increase the target SNR Margin using the command, interface dsl config

port(1-25) margin 9.

If bit errors persist, enable the interleaver function using the command

interface dsl config port(1-25) interleaver both. Note this command will

reduce TCP throughput. Generally, an interleaver should only be used

only for non latency sensitive services such as IPTV.

XLP-6800

The information provided for the T3 System also applies to XLP-6800. XLP-6800 has additional

items that can be used to manage performance under adverse wire conditions.

Excessive Crosstalk XLP features multiple programmable bandplans. Each bandplan is

optimized for different wire environments. Select the 75-75 bandplan

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