Crocus SHDSL G703.pdf - FTP Directory Listing
Crocus SHDSL G703.pdf - FTP Directory Listing Crocus SHDSL G703.pdf - FTP Directory Listing
88 Crocus SHDSL G703 Chapter 5 User manual Step-by-step configuration 5.6.1 Important remark on the minimum line pair speed If you configure the minimum line pair speed (i.e. you set the minLinePairSpeed attribute to any value different from ), then only one master clock is allowed in the system. In other words, only the following clocking combinations are allowed: One side internal external external station Other side always slave receive slave receive external (provided the application on both sides use the same network clock) station or slave receive Executing an ET test on both sides will not work in case both sides change their clocking modes to internal! Example The following is a perfectly legal set-up as long as the minimum line pair speed is not configured (i.e. minLinePairSpeed = ): • clocking = internalPreferred • speed = 640kbps • minLinePairSpeed = • clocking = internalPreferred • speed = 640kbps • minLinePairSpeed = However, if you set the minimum line pair speed to a value higher than the user speed, then the SHDSL line operates in slotted E1 mode. In that case, only one master clock is allowed in the system. So you would have to change the configuration to, for example: • clocking = internalPreferred • speed = 640kbps • minLinePairSpeed = 1024kbps • clocking = slaveRcvPreferred • speed = 640kbps • minLinePairSpeed = 1024kbps In these general examples, serial interfaces are used, but the principle stays the same for G703 interfaces.
Crocus SHDSL G703 Chapter 5 89 User manual Step-by-step configuration 5.6.2 The minimum line pair speed attribute Also see 5.6.1 - Important remark on the minimum line pair speed on page 88. The location of the minimum line pair speed attribute in the Crocus SHDSL G703 containment tree is: crocusShdslTtRpG703/line/minLinePairSpeed Use the minLinePairSpeed attribute to determine what the minimum speed on the line pair has to be when the Crocus SHDSL G703 trains. The purpose of this is: Default: Range: 192kbps up to 2048kbps (in steps of 64kbps) • To be able to set the line speed independently from the user speed. This allows easy upgrading to a higher user speed. • To be able to use less than 3 time slots (or 6 time slots on a 2 pair version).
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88 <strong>Crocus</strong> <strong>SHDSL</strong> G703 Chapter 5<br />
User manual<br />
Step-by-step configuration<br />
5.6.1 Important remark on the minimum line pair speed<br />
If you configure the minimum line pair speed (i.e. you set the minLinePairSpeed attribute to any value different<br />
from ), then only one master clock is allowed in the system.<br />
In other words, only the following clocking combinations are allowed:<br />
One side<br />
internal<br />
external<br />
external<br />
station<br />
Other side<br />
always slave receive<br />
slave receive<br />
external (provided the application on both sides use the same network clock)<br />
station or slave receive<br />
Executing an ET test on both sides will not work in case both sides change their clocking modes to internal!<br />
Example<br />
The following is a perfectly legal set-up as long as the minimum line pair speed is not configured (i.e.<br />
minLinePairSpeed = ):<br />
• clocking = internalPreferred<br />
• speed = 640kbps<br />
• minLinePairSpeed = <br />
• clocking = internalPreferred<br />
• speed = 640kbps<br />
• minLinePairSpeed = <br />
However, if you set the minimum line pair speed to a value higher than the user speed, then the <strong>SHDSL</strong><br />
line operates in slotted E1 mode. In that case, only one master clock is allowed in the system. So you<br />
would have to change the configuration to, for example:<br />
• clocking = internalPreferred<br />
• speed = 640kbps<br />
• minLinePairSpeed = 1024kbps<br />
• clocking = slaveRcvPreferred<br />
• speed = 640kbps<br />
• minLinePairSpeed = 1024kbps<br />
In these general examples, serial interfaces are used, but the principle stays the same for G703 interfaces.
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