When you're comparing the cable platforms, it is incorrect to compare RJ45, RJ11, or F connectors (the connection type used on coax cabling.) First the cabling is the base by which comparisons are made concerning data transmission rate. There are various types of cables with respected to twisted pair copper wiring for voice and data transmission. These are referred to as Category cabling. The most common Category cabling out there now are Category 3, 5, and 5e. While Category 6 and 6a are now becoming more mainstream with Category 7 starting to show more of a presence. What each Category cabling means is the cables ability to support signal modulation and hence data rate. Category 3 supports 16MHz signaling and data tranmission rate of 10Mbps. Category 5 supports 100MHz signaling at 100Mbps. Category 5e also supports 100MHz signaling but other cabling specs were tightened up to allow reliable operation up to 1000Mbps. Category 6 supports 250MHz signaling and has even more tighter cable specs over Cat5e resulting in its ability to support 10GigE at cable lengths up to 55M. Category 6a supports 500 MHz signaling and as a result can support 10GigE but extends support to a max distance of 100M.
The same applies to coax cabling where the previous mainstream spec was RG59 which has since been replaced in favor of the higher bandwidth capabilities of RG6.
With the Category cabling, you can terminate the cables with any end you want. You may not use all the copper pairs contained in the cable itself. So with Cat6, you have 4 pairs of copper wires or 8 wires. I can still terminate this cable with an RJ11 if I wanted to. But it's no coincidence the wiring standards (T568A or B) were set up such that your regular POTS 1 pair (2 wire) analog connections are physically compatible with a wiring plant set up for Ethernet connectivity. Because of this, you can turn any RJ45 jack (if wired correctly per the standards) into either a POTS/PSTN or an Ethernet port based on how you patch in the other end of the wire drop.
So back to your discussion about DSL. DSL is a different data transmission protocol which was developed as a WAN transmission carrier to be used over POTS lines (1 wire pair cabling.) And its insertion into this discussion is the apples and oranges comparison cliche.
The same applies to coax cabling where the previous mainstream spec was RG59 which has since been replaced in favor of the higher bandwidth capabilities of RG6.
With the Category cabling, you can terminate the cables with any end you want. You may not use all the copper pairs contained in the cable itself. So with Cat6, you have 4 pairs of copper wires or 8 wires. I can still terminate this cable with an RJ11 if I wanted to. But it's no coincidence the wiring standards (T568A or B) were set up such that your regular POTS 1 pair (2 wire) analog connections are physically compatible with a wiring plant set up for Ethernet connectivity. Because of this, you can turn any RJ45 jack (if wired correctly per the standards) into either a POTS/PSTN or an Ethernet port based on how you patch in the other end of the wire drop.
So back to your discussion about DSL. DSL is a different data transmission protocol which was developed as a WAN transmission carrier to be used over POTS lines (1 wire pair cabling.) And its insertion into this discussion is the apples and oranges comparison cliche.