Etic Telecom XLAN+ Series, Setup Manual

Page: 14 / 84

SETUP
Page 14
DOC_DEV_XS_Setup guide_C
2.2 Connection profiles
A connection profile includes all the technical parameters of an SHDSL connection.
To make the connection process as simple as possible, five profiles are available.
To set an SHDSL connection, one of these profiles has to be assigned to each SHDSL port.
STU-R, Auto
This profile has to be assigned to an SHDSL port when it has to wait for the connection (see the drawing
above).
STU-C, Standard
The SHDSL port configured with this profile initiates the connection but is able to switch to STU-R mode if it
detects the presence of an STU-C at the other end.
The connection is established at a data rate compliant to the EFM standard up to 5.6 Mb/s.
The SNR ratio margin is medium; the date rate is medium and the risk of disconnection is reasonable in case
of any disturbance.
The duration to establish the connection is typically 45 seconds and may take up to 1 minute 30.
This profile is suitable for most situations, i.e. with no or moderate noise and using usual twisted pair
transmission cables.
STU-C, Endurance
The SHDSL port configured with this profile initiates the connection but is able to switch to STU-R mode if it
detects the presence of an STU-C at the other end.
The connection is established at a data rate compliant to the EFM standard up to 5.6 Mb/s.
The SNR ratio margin is high; the date rate is low and the risk of disconnection is low in case of any
disturbance.
The duration to establish the connection is longer, typically 3 minutes and may take up to 5 minutes.
This profile is suitable for medium to very noisy lines or on cables not dedicated to the transmission such as
cables with a large diameter or electrical cables.
STU-C, Performance
The SHDSL port configured with this profile initiates the connection but is able to switch to STU-R mode if it
detects the presence of an STU-C at the other end.
The connection is established at a data rate compliant to the EFM standard up to 15,2 Mb/s.
The SNR ratio margin is low; the date rate is high and the risk of disconnection is high in case of any
disturbance.
The duration to establish the connection is longer, typically 3 minutes and may take up to 5 minutes.
This profile is suitable for slightly noisy lines. The highest data rates are obtained on short distances.
STU-C, Fixed datarate
The SHDSL port configured with this profile initiates the connection.
This profile is not usable directly; It must be edited to select the desired data rate ("Copy and change").
See
Advanced setting up of an SHDSL link
The duration to establish the connection is the fastest, typically 30 seconds.
However, it requires the user to perform tests by changing the data rate until getting a connection with the
expected SNR ratio margin.