Connection: G.shdsl With Dsl Controller - Cisco OL-4015-08 User Manual

Chapter 4 Edit Interface/Connection
Note
Enable Sound to Noise Ratio Margin
DSL Connections
OL-4015-08
If you have selected a 4-wire connection, you must select a fixed line rate. The
supported line rates for a 4-wire connection are 384, 512, 640, 768, 896, 1024,
1152, 1280, 1408, 1664, 1792, 1920, 2048, 2176, 2304, 2432, 2688, 2816, 2944,
3072, 3200, 3328, 3456, 3584, 3712, 3840, 3968, 4096, 4224, 4352, 4480, and
4608
If different DSL line rates are configured at opposite ends of the DSL uplink, the
actual DSL line rate is always the lower rate.
Sound to noise ration margin provides a threshold for the DSL modem to
determine whether it should reduce or increase its power output depending on the
amount of noise on the connection. If you have set the line rate to "auto", you can
enab le this feature to maximize the quality of the DSL connection. Note that you
cannot use this feature if your line rate is fixed. To enable the sound to noise ration
margin, check this box and select the ration margins in the Current and Snext
fields. To disable this feature, clear this box.
Current
Select the sound to noise ration margin in the form of decibals on the current
connection. The lower the ration selected here, the more noise will be tolerated on
the connection. A lower Db setting will cause the DSL modem to allow more
noise on the line, potentially resulting in a lower quality connection, but
potentially increasing throughput on the connection. A higher Db setting causes
the modem to restrict noise, potentially resulting in a higher quality connection
but possibly lower throughput.
Snext
Select the Self near end cross talk (Snext) sound to noise ration margin in the form
of decibals.
This field displays all of the G.SHDSL connections currently configured on this
controller. To configure a new G.SHDSL connection, click Add. This will display
the

Connection: G.SHDSL with DSL Controller

new connection. To edit an exisiting G.SHDSL connection, select the connection
Cisco Router and Security Device Manager Version 2.2 User's Guide
Configure DSL Controller
page, letting you configure the
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