<instructions>Your goal is to analyze the following comment and estimate how highly it will be upvoted by the Hacker News community.</instructions><comment><author>dfox</author><text>Another issue with DSL bonding is crosstalk, which is pretty bad in many cases of telco wiring.&lt;p&gt;10 years ago there was a huge amount of surplus Cisco 1700s with SHDSL line cards (apparently coming from Czech government&amp;#x27;s project to connect every school to internet in early 00&amp;#x27;s) and we had huge spool of flat phone cable that was left over from earlier project. So we had the bright idea to wrap ethernet trafic in AAL5, pass that over SHDSL and use that as an LAN for anime convention. Interesting observation from that it matters whether the cable is coiled or un-coiled. We built and tested the whole network in a lab (with coiled cables), it worked well, the G.991bis bonded links synced up at 6Mbps with two pairs and everything was good. We labeled everything and we built the exact same thing (including same cables) at the venue and the links will not go above 1.5Mbps and were frequently losing sync. Disabling the second bonded pair caused it to work reliably at 2Mbps. (Back then, we did not need that much of bandwidth, it was essentially for few SCCP phones, some IP tunelled serial ports and ssh)&lt;p&gt;Well, next year we bought two boxes of Cat5 cable and switched to native ethernet (and today the backbone spans are 10G fiber, as it also carries video streams).</text><parent_chain><item><author>mbreese</author><text>This is funny. About 10 years ago, I had bonded ADSL for my internet (yay sonic.net). The idea being that two lines bonded together would have twice as much bandwidth as a single line. Each line had a max rate of 20Mbps, so I had a max of 40Mbps combined.  It worked pretty well initially, but over time it degraded horribly. Because you could see stats for each line independently, I could tell that one line was operating at ~18Mbps and the other was around 2 and there was a lot of error recovery going on. After much complaining, I found out that one line was degraded and somehow reacted to rain (water got in the trunk somehow). And no, AT&amp;amp;T wasn’t going to fix the broken line.&lt;p&gt;I chose to just use the single (good) line.&lt;p&gt;So, yes, I can confirm this does work in the field… but with about as much practically as you’d expect.</text></item></parent_chain></comment><story><title>ADSL works over wet string (2017)</title><url>https://www.revk.uk/2017/12/its-official-adsl-works-over-wet-string.html</url></story>
<instructions>Your goal is to analyze the following comment and estimate how highly it will be upvoted by the Hacker News community.</instructions><comment><author>Scoundreller</author><text>I’m always a bit amazed when &lt;i&gt;every&lt;/i&gt; home has 2 lines running to it, and probably 99% of those second lines never get used, but telcos figured it was worth it for those occasional 2nd lines&amp;#x2F;fax lines or redundancy instead of ever needing to run a 2nd pull.&lt;p&gt;Is this just a North America thing or an everywhere thing?</text><parent_chain><item><author>mbreese</author><text>This is funny. About 10 years ago, I had bonded ADSL for my internet (yay sonic.net). The idea being that two lines bonded together would have twice as much bandwidth as a single line. Each line had a max rate of 20Mbps, so I had a max of 40Mbps combined.  It worked pretty well initially, but over time it degraded horribly. Because you could see stats for each line independently, I could tell that one line was operating at ~18Mbps and the other was around 2 and there was a lot of error recovery going on. After much complaining, I found out that one line was degraded and somehow reacted to rain (water got in the trunk somehow). And no, AT&amp;amp;T wasn’t going to fix the broken line.&lt;p&gt;I chose to just use the single (good) line.&lt;p&gt;So, yes, I can confirm this does work in the field… but with about as much practically as you’d expect.</text></item></parent_chain></comment><story><title>ADSL works over wet string (2017)</title><url>https://www.revk.uk/2017/12/its-official-adsl-works-over-wet-string.html</url></story>