Fast Mode; Configured Versus Actual Adsl Rates; Adsl Profile Screen - ZyXEL Communications MSC1024G Series User Manual

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Chapter 13 Profile Screens

Reed-Solomon codes are block-based error correcting codes with a wide range of applications.

The Reed-Solomon encoder takes a block of digital data and adds extra "redundant" bits. The

Reed-Solomon decoder processes each block and attempts to correct errors and recover the

original data.

13.2.1 Fast Mode

Fast mode means no interleaving takes place and transmission is faster (a "fast channel"). This

would be suitable if you have a good line where little error correction is necessary.

You configure the maximum rate of an individual ADSL port by modifying its profile (see the

set profile command) or assigning the port to a different profile (see the set port command).

However, due to noise and other factors on the line, the actual rate may not reach the

maximum that you specify.

Even though you can specify arbitrary numbers in the set profile command, the actual rate is

always a multiple of 32 Kbps for the G.dmt, ANSI T1.413 and G.lite ADSL standards or a

multiple of 4 Kbps for the ADSL2 and ADSL2+ standards.

With the G.dmt, ANSI T1.413 and G.lite ADSL standards, if you enter a rate that is not a

multiple of 32 Kbps, the actual rate will be the next lower multiple of 32 Kbps. For instance, if

you specify 60 Kbps for a port, the actual rate for that port will not exceed 32 Kbps, and if you

specify 66 Kbps, the actual rate will not be over 64 Kbps.

With the ADSL2 and ADSL2+ standards, if you enter a rate that is not a multiple of 4 Kbps,

the actual rate will be the next lower multiple of 4 Kbps. For instance, if you specify 67 Kbps

for a port, the actual rate for that port will not exceed 64 Kbps, and if you specify 69 Kbps, the

actual rate will not be over 68 Kbps.

Note that when you configure an ADSL port, the upstream rate must be less than or equal to

the downstream rate. Note also that the list port command displays the configured parameters

of the ADSL port, while the show port command displays the actual rates.

Click Profile > ADSL in the navigation panel to open the following screen. Use this screen to

configure ADSL profiles. Later you can use the ADSL profiles to configure ADSL ports in the

ADSL Port Setup screens.

MSC1000G/1024G/1224G Series User's Guide

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