Re: [gentoo-user] Re: soliciting a DHCP lease / carrier lost
On 04/05/2017 06:35 PM, Daniel Frey wrote: > On 04/05/2017 01:25 PM, the...@sys-concept.com wrote: >> >> I think this cable tester was only designed to work with passive >> receiver (that came with it) on the other end. >> Using active part with switch doesn't give meaningful reading, it only >> confirm that that are no broken wires inside. >> > > It is possible to damage a switch port by hooking one of the cheap > testers directly to one of the switch ports, just a warning. The testers > that actually do speed certification testing are safe. If the tester you > have only has LEDs to indicate continuity don't hook it up to a switch port! > > Dan Thank you for the warning. I didn't know that. -- Thelma
Re: [gentoo-user] Re: soliciting a DHCP lease / carrier lost
On 04/05/2017 01:25 PM, the...@sys-concept.com wrote: > > I think this cable tester was only designed to work with passive > receiver (that came with it) on the other end. > Using active part with switch doesn't give meaningful reading, it only > confirm that that are no broken wires inside. > It is possible to damage a switch port by hooking one of the cheap testers directly to one of the switch ports, just a warning. The testers that actually do speed certification testing are safe. If the tester you have only has LEDs to indicate continuity don't hook it up to a switch port! Dan
Re: [gentoo-user] Re: soliciting a DHCP lease / carrier lost
On 04/05/2017 12:22 PM, Kai Krakow wrote: > Am Wed, 5 Apr 2017 09:40:32 -0600 > schrieb the...@sys-concept.com: > [snip] >> >> The problem with the cable was incorrect cross-over, the cable was >> installed by a contractor few years back and terminated by them. >> >> When I initially tested the cable with cable tester one end was >> connected to a switch I connected the tester to another and all the >> lights were working in order. Wrong assumption. >> The switch will respond to any ping and give a false readout. > > May I suggest that you use the active part of the tester always on the > side where the switch would be connected? This sorts out such > problems. ;-) I think this cable tester was only designed to work with passive receiver (that came with it) on the other end. Using active part with switch doesn't give meaningful reading, it only confirm that that are no broken wires inside. > >> I suppose to connect one end to transmitter and the other end to the >> receiver (that came with it) and I've noticed incorrect order. >> From Left: >> Orange/White >> Orange >> Blue/Stripe >> Blue >> Green/Stripe >> Green >> Brown/Strip >> Brown >> >> Re-termination fixed the problem. > > Good that you found it. Does it work correctly now? It was late last night, so I didn't have a chance to test it, but will do it this week. -- Thelma
Re: [gentoo-user] Re: soliciting a DHCP lease / carrier lost
On 04/05/2017 08:14 AM, Daniel Frey wrote: > On 04/04/2017 03:11 PM, Kai Krakow wrote: >> >> That's a good note. >> >> I think punch down is similar to LSA plus here in Germany, tho the >> tools look very different. But with LSA you also push the wire between >> to cutting contacts. >> > > Yeah, it sounds like it works the same here: a wire is pushed through a > V-bladed contact via a tool. > > Dan The problem with the cable was incorrect cross-over, the cable was installed by a contractor few years back and terminated by them. When I initially tested the cable with cable tester one end was connected to a switch I connected the tester to another and all the lights were working in order. Wrong assumption. The switch will respond to any ping and give a false readout. I suppose to connect one end to transmitter and the other end to the receiver (that came with it) and I've noticed incorrect order. >From Left: Orange/White Orange Blue/Stripe Blue Green/Stripe Green Brown/Strip Brown Re-termination fixed the problem. -- Thelma
Re: [gentoo-user] Re: soliciting a DHCP lease / carrier lost
On 04/04/2017 03:11 PM, Kai Krakow wrote: > > That's a good note. > > I think punch down is similar to LSA plus here in Germany, tho the > tools look very different. But with LSA you also push the wire between > to cutting contacts. > Yeah, it sounds like it works the same here: a wire is pushed through a V-bladed contact via a tool. Dan
Re: [gentoo-user] Re: soliciting a DHCP lease / carrier lost
On 04/04/2017 02:49 PM, Kai Krakow wrote: > No, if you have the same wrong on both sides, the LEDs will still show > correct blinking order. Think of it like this: If you use order > 7-5-3-1-2-4-6-8 on both sides, blinking LED 1 on one side will blink > the same LED on the other side because they both connect to wire 7. But > the twisted pairs that should be twisted are no longer because now you > connected pair 1 in the connector to wire 7 and 5 which belong to > different pairs in the wire. The wire twists pair (7,8) and (4,5). On > the long run, interference now cannot be canceled out because this > only works if wires are twisted in the same pair. The connector (and > ethernet standard) expects the following pairs on the connector: > > A-A-B-C-C-B-D-D > 1-2-3-4-5-6-7-8 > > For electrical reasons it also expects a white wire alternating with a > colored pair, which makes the following pairs: > > A = (1,2) > B = (3,6) > C = (5,4) > D = (7,8) > > Or: > > A-a B c-C b D-d > ^_^ > > With the capital letters being either all white or all colored (this > doesn't depend as long as it's the same on both sides). > > You could open the problematic wall outlets and check the cabling > yourself. Keep in mind that unmounting the wall outlet may make the > problem of bent cables even worse due to moving and bending the wires > even more. I'll pitch in one interesting thing of note: the local supplier here went with el-cheapo Chinese made punch down and crimp ends some years ago. These are supposed to be 22 AWG wire size, but after dealing with bad connections I found out these Chinese punch downs were more like 24-26 AWG, meaning when punched down it would not make proper contact with the properly spec'ed wire. Dan
Re: [gentoo-user] Re: soliciting a DHCP lease / carrier lost
On 04/04/2017 02:56 PM, Kai Krakow wrote: > Am Tue, 4 Apr 2017 14:28:23 -0600 > schrieb the...@sys-concept.com: > [snip] >> >> I have reconnected another cable and the unit in remote location >> works. Both cable have a good pinout but one is working and the other >> is not. Both cable are sunning inside wall (I presume same path). >> Without special tools/testing equipment it is hard to trace these >> problems. > > You could try the problematic cable with only 100 MBit. If this works, > I'm pretty sure that some of the wires are broken or have incorrect > order. Keep in mind, tho, that the inverse assumption of such tests is > not true. Yes, the testing took was cheap it came with the stripper. Though, if the cable order was wrong, wouldn't the light on the tester jump in different order? The light on the tester lights up sequentially, so I assume the order is correct. Besides that "bad" cable was working OK for a day. And yes, the room the cable is passing by has all kind or x-ray machine. I'll try to test it 100Mbit (limit the speed); just need to find out how. -- Thelma.
