Interleaved Mode?

[Diesal]

So I was looking at my line stats and I noticed the the ADSL mode is no longer set to fast but rather interleaved mode? What does this mean? Also the line does not sync at 4096K but rather 4089k and upload speed went from 512k to 508k, my attenuation has also decreased by 3db....

Hmmm?

 

[Tinuva]

Interleaved mode is useful in situations where there are line sync problems, interleaved mode in such a situation improve the quality, but slows it a bit down, most notably your latency will be higher for gaming.

ADSL modems are capable of data interleaving, which is a technique used to increase resistance to noise bursts on a line. Interleaving decreases the chance that noise on a line will cause data transmission errors. Interleaving may be necessary in situations where the quality of the phone line is sub-standard or you are approaching the distance limits of DSL service.

The down-side of interleaving is that it increases latency (ping). This is because a single packet is spread out over several packets before it can be fully sent or fully received. Interleaving may be necessary to ensure a stable and reliable connection in cases where the line quality is poor.

You can tell if interleaving is active on your line by measuring the first hop ping. If it is under 20ms, interleaving is disabled. If it is above 35ms, interleaving is enabled.

 

[Diesal]

Ah I see, the line has been a whole lot stable since this has started.

 

[RPG_Fan]

When they upgraded my line to 10meg, they changed mine from fast to interleave mode

 

[grim]

"Fastpath and Interleaving
Interleaving is forward error correction. Your packet bits are spread in time and interleaved with bits from other packets, so that a noise spike has less chance of causing data loss. This is a design feature, which makes video streaming (a la "video on demand) more robust. Remember that ADSL was originally developed for "cable TV on copper loops" but when that didn't take off it was (is) used for highspeed Internet access. TCP/IP has it's own error correcting facilities and interleaving is not nearly as important. Fast Path disables or greatly reduces the interleaving "spread" of the bits.

Decreased latency (ping times) can improve performance of streaming content and makes browsing snappier. It can also help with FTP and other densely packed file transfer protocols. Low pings are critical for online gaming.

If you changed over, you probably would not see any problems unless your line is marginal. TCP/IP retransmits packets, which are corrupted and unless your line has high packet loss, can handle the occasional noise burst quite nicely. If you have a very noisy line your modem could lose sync, which is not good at all. This is unlikely."

Source: http://www.dslreports.com/faq/1238