brad225 Posted November 24, 2019 Share Posted November 24, 2019 In the never-ending attempt to have an organized loom of wires behind my audio equipment, a new question arises. How short can ethernet cables be and function properly? I have not seen what is generally considered audiophile cable manufactures that have short, say 12" cables. I do have .5 meter but still a bit to long. Do any of you use short cables or just do your best to organize? Thanks Link to comment
Ralf11 Posted November 24, 2019 Share Posted November 24, 2019 ~~ 3.33333333e-7 meters don't worry about it Link to comment
botrytis Posted November 24, 2019 Share Posted November 24, 2019 33 minutes ago, brad225 said: In the never-ending attempt to have an organized loom of wires behind my audio equipment, a new question arises. How short can ethernet cables be and function properly? I have not seen what is generally considered audiophile cable manufactures that have short, say 12" cables. I do have .5 meter but still a bit to long. Do any of you use short cables or just do your best to organize? Thanks Ethernet max length is 100 feet before using a switch. Current: Daphile on an AMD A10-9500 with 16 GB RAM DAC - TEAC UD-501 DAC Pre-amp - Rotel RC-1590 Amplification - Benchmark AHB2 amplifier Speakers - Revel M126Be with 2 REL 7/ti subwoofers Cables - Tara Labs RSC Reference and Blue Jean Cable Balanced Interconnects Link to comment
One and a half Posted November 24, 2019 Share Posted November 24, 2019 Going back a time now, but recall the minimum length from a switch to a device was 1m from the CAT5 days. Maybe it was a limitation on what was behind the RJ45 in the switch? AS Profile Equipment List Say NO to MQA Link to comment
One and a half Posted November 24, 2019 Share Posted November 24, 2019 5 minutes ago, botrytis said: Ethernet max length is 100 feet before using a switch. Thought it was 100m ? AS Profile Equipment List Say NO to MQA Link to comment
botrytis Posted November 24, 2019 Share Posted November 24, 2019 1 minute ago, One and a half said: Thought it was 100m ? Sorry 100 meters - you are right Current: Daphile on an AMD A10-9500 with 16 GB RAM DAC - TEAC UD-501 DAC Pre-amp - Rotel RC-1590 Amplification - Benchmark AHB2 amplifier Speakers - Revel M126Be with 2 REL 7/ti subwoofers Cables - Tara Labs RSC Reference and Blue Jean Cable Balanced Interconnects Link to comment
brad225 Posted November 24, 2019 Author Share Posted November 24, 2019 Thanks for the reply but I am looking for short 12"-18" long. Link to comment
mansr Posted November 24, 2019 Share Posted November 24, 2019 There is no (practical) lower limit to the length. I use a few that are about 6 inches long. phosphorein 1 Link to comment
Speedskater Posted November 25, 2019 Share Posted November 25, 2019 20 hours ago, One and a half said: Going back a time now, but recall the minimum length from a switch to a device was 1m from the CAT5 days. That was just another audiophile misunderstanding. Link to comment
One and a half Posted November 25, 2019 Share Posted November 25, 2019 2 hours ago, Speedskater said: That was just another audiophile misunderstanding. Fiber connections have minimum cable lengths due to level requirements on received signals.[36] Fiber ports designed for long-haul wavelengths require a signal attenuator if used within a building. 10BASE2 installations, running on RG-58 coaxial cable, require a minimum of 0.5 m between stations tapped into the network cable, this is to minimize reflections.[37] 10BASE-T, 100BASE-T, and 1000BASE-T installations running on twisted pair cable use a star topology. No minimum cable length is required for these networks. From Wikipedia topic, Ethernet. FelipeRolim 1 AS Profile Equipment List Say NO to MQA Link to comment
plissken Posted November 25, 2019 Share Posted November 25, 2019 23 hours ago, botrytis said: Ethernet max length is 100 feet before using a switch. It's 328 feet or 100 meters. Modern PHY (like past 15 years) can push 380 feet before BER starts showing up. Link to comment
HC515 Posted November 25, 2019 Share Posted November 25, 2019 20 hours ago, mansr said: There is no (practical) lower limit to the length. I use a few that are about 6 inches long. Heck may as well hard wire the two devices together 😉 Link to comment
Speedskater Posted November 25, 2019 Share Posted November 25, 2019 17 minutes ago, One and a half said: 10BASE2 installations, running on RG-58 coaxial cable, require a minimum of 0.5 m between stations tapped into the network cable, this is to minimize reflections. See that's how audiophile misunderstandings get started. They take information out of context and mis-apply it. marce 1 Link to comment
HumanMedia Posted November 26, 2019 Share Posted November 26, 2019 On 11/25/2019 at 7:43 AM, One and a half said: Going back a time now, but recall the minimum length from a switch to a device was 1m from the CAT5 days. Maybe it was a limitation on what was behind the RJ45 in the switch? Depending on the equipment being connected shorter lengths may work. The 1m rule is to make sure there is enough capacitance for the PHY tranceivers to work correctly. Some switches add capacitors to make sure shorter lengths will work. Some do not. marce 1 Link to comment
mansr Posted November 26, 2019 Share Posted November 26, 2019 31 minutes ago, HumanMedia said: Depending on the equipment being connected shorter lengths may work. The 1m rule is to make sure there is enough capacitance for the PHY tranceivers to work correctly. Some switches add capacitors to make sure shorter lengths will work. Some do not. What is your source for this? I can't find a mention of a minimum load capacitance in the Ethernet spec or in any of a few phy datasheets I checked. Link to comment
Samuel T Cogley Posted November 26, 2019 Share Posted November 26, 2019 There is no minimum length in the 802.3 spec that I can find. But I did find this 😎 marce 1 Link to comment
Speedskater Posted November 27, 2019 Share Posted November 27, 2019 I don't recall ever reading anything in 'transmission line theory' about short cable length problems. Link to comment
marce Posted November 28, 2019 Share Posted November 28, 2019 On 11/25/2019 at 7:45 PM, One and a half said: Fiber connections have minimum cable lengths due to level requirements on received signals.[36] Fiber ports designed for long-haul wavelengths require a signal attenuator if used within a building. 10BASE2 installations, running on RG-58 coaxial cable, require a minimum of 0.5 m between stations tapped into the network cable, this is to minimize reflections.[37] 10BASE-T, 100BASE-T, and 1000BASE-T installations running on twisted pair cable use a star topology. No minimum cable length is required for these networks. From Wikipedia topic, Ethernet. So no minimum cable length then... were you making a point? as no one has used RG-58 for years, if ever in the home and as to long haul fibre!!! if so it was pointless. LOL Link to comment
marce Posted November 28, 2019 Share Posted November 28, 2019 On 11/26/2019 at 10:50 PM, Samuel T Cogley said: There is no minimum length in the 802.3 spec that I can find. But I did find this 😎 I was going to say as long as you can wire it up, that is just silly though... Link to comment
mansr Posted November 28, 2019 Share Posted November 28, 2019 41 minutes ago, marce said: I was going to say as long as you can wire it up, that is just silly though... I'm sure Uptone will be selling one before long. If their USB lineup is any indication. Link to comment
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