User`s guide

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XSRING+ SHDSL switch User’s guide ref 9018809-01 Page 31
9.2 SHDSL connection profiles
Auto STU-R profile :
That connection profile has to be assigned to an shdsl port when it has to wait for the connection
(see the drawing above).
Endurance STU-C profile :
An shdsl port to which that profile is assigned will initiate the connection.
The value of the SNR margin of that profile is maximum; it means that the connection will be set
at a low data rate to decrease the disconnection probability.
That profile is convenient when the conditions are poor because the noise level varies or is
important, and or because the distance is important, and or because the quality of the twisted pair
is poor.
That profile has to be advised also if disconnections are observed when using the standard profile
or the performance profile.
That profile can be advised, also, when the frequency of the disconnections must be as low as
possible.
Standard STU-C profile :
An shdsl port to which that profile is assigned will initiate the connection.
The value of the SNR margin is medium; it is why, the connection will be set at a medium data
rate.
Disconnections may appear but only in case of strong signal disturbances.
That profile is convenient in usual conditions when the noise level is stable, and or the distance is
not too close from the limit, and or when the quality of the line is good.
Performance STU-C profile :
An shdsl port to which that profile is assigned will initiate the connection.
The value of the SNR margin is low; it is why, the connection will be set at a high data rate.
Disconnections may appear in case of disturbances.
That profile is convenient when the highest data rate is wished.
That profile is convenient when the noise level is stable and low, and or the distance is far from
the limit, and or when the quality of the line is good.
Turbo-short STU-C profile :
An shdsl port to which that profile is assigned will initiate the connection.
That profile makes possible to get a high data rate – up to 10 Mb/s – over a short distance
(typically shorter than 1 Km).