Crocus SHDSL G703.pdf - FTP Directory Listing

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92 Crocus SHDSL G703 Chapter 5 User manual Step-by-step configuration 5.6.3 Purpose of the minimum line pair speed Easily upgrading the user speed You could determine in advance what the maximum speed is that can be achieved on the line (e.g. 1024 kbps) and set the minimum line pair speed to this value (e.g. minLinePairSpeed = 1024kbps). Suppose the customer initially wants 256 kbps. So you set the user speed to 256 kbps (speed(2P) = 256kbps). Now when the customer decides he wants a higher user speed (e.g. 640kbps), then you can easily change the user speed to this higher speed (e.g. speed(2P) = 640kbps) without first having to determine again whether the line can handle this speed. What is more, the line does not have to retrain after you changed the user speed. So you can perform user speed upgrades in an easy, cost-efficient way. Low speed operation - compatibility with other SHDSL devices If you want to use only 1 or 2 time slots (or 2 or 4 time slots in case of a 2 pair version), then you have to set the minimum line pair speed to 192 kbps (minLinePairSpeed = 192kbps). This to insure correct time slot synchronisation on both sides. Low speed operation - 2 time slots and 2 applications If you want to use only 2 time slots (or 4 time slots in case of a 2 pair version) and each time slot carries the data of a different application, then you also have to set the minimum line pair speed to 192 kbps (minLinePairSpeed = 192kbps). This to insure that on the remote side the data is separated correctly. The reason is the following: • In case you select only 2 time slots (or 4 time slots in case of a 2 pair version) but you do not configure the minimum line pair speed (minLinePairSpeed = ), then the SHDSL line operates in Nx64 mode (refer to crocusShdslTtRpG703/line/framerType on page 166 for more information on this mode). Since in this case the user data has become a continuous bit stream on the SHDSL line, it is almost impossible to correctly separate the data from the two different applications at the remote end. • In case you select only 2 time slots (or 4 time slots in case of a 2 pair version) but you configure the minimum line pair speed to be 192 kbps (minLinePairSpeed = 192kbps), then the SHDSL line operates in slotted E1 mode (refer to crocusShdslTtRpG703/line/framerType on page 166 for more information on this mode). Since in this case the user data is also put in time slots on the SHDSL line, it is perfectly possible to separate the data from the two different applications at the remote end.
Crocus SHDSL G703 Chapter 5 93 User manual Step-by-step configuration 5.7 Configuring framing and time slots This section explains how to select the framing mode and how to allocate time slots on a Crocus SHDSL G703. The following gives an overview of this section: • 5.7.1 - Selecting unframed or framed mode on page 94 • 5.7.2 - Selecting the time slots on page 95 • 5.7.3 - Time slot transposition on page 96
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