Chapter 13 xDSL Port Setup
For example, you could set up different profiles for different kinds of accounts (for example, economy, standard and premium). Assign the appropriate profile to an ADSL port and it takes care of a large part of the port’s configuration maximum and minimum transfer rates. You still get to individually enable or disable each port, as well as configure its channels and operational mode.
13.4 Interleave Delay
Interleave delay is the wait (in milliseconds) that determines the size of a single block of data to be interleaved (assembled) and then transmitted. Interleave delay is used when transmission error correction (Reed- Solomon) is necessary due to a less than ideal telephone line. The bigger the delay, the bigger the data block size, allowing better error correction to be performed.
13.4.1 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.
13.5 Configured Versus Actual Rate
You configure the maximum rate of an individual ADSL port by modifying its profile (see Chapter 14 on page 125) or assigning the port to a different profile (see Section 13.7.1 on page 111). 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 using the Edit Profile screen, the actual rate is always a multiple of 32 Kbps. If you enter a rate that is not a multiple of 32 Kbps, the actual rate will be the next lower multiple of 32Kbps. 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 64Kbps.
Regardless of a profile’s configured upstream and downstream rates, the
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