The suppressors clamp at higher voltages like 90 volts for low energy stuff, if you dump any real current into the clamp voltage comes down to about 68 volts.
From: Forrest Christian (List Account) Sent: Saturday, September 10, 2016 3:30 AM To: af Subject: Re: [AFMUG] Gigabit Ethernet on Cambium 450i only running 100Mbps Just curious... what voltage are you feeding into the injector? I wonder if maybe if you're starting at 56V, then adding a bit of inductive surge effects due to the cable and sync pulse thing. I could see this surging into 60 volts for sure... not sure where Chuck's suppressors clamp at. -forrest On Fri, Sep 9, 2016 at 7:10 PM, George Skorup <[email protected]> wrote: So, what do you think? Based on my test, it's definitely the sync pulse disrupting the GigE data, at least on the 7/8 pair I'm guessing. Is it possible that we have HV marked modules that are in fact not HV? I assume you have two different assembly lines for regular and HV? Or do you just do batches of one or the other? Either one would probably rule that out. It would really suck to have to pull out the SS's to get GigE on the 450 when we finally get 30MHz channel support. No surge suppression at all scares me. 20MHz channel width really doesn't need gigabit which is why I've never bothered with it. Maybe Forrest would be willing to send you one of his new PowerInjector+Sync modules and a SyncPipe for debugging? And with the 450i taking power on all four pairs, I could see the sync pulse causing the SS to clamp on the 10/100 data pairs, too. Meaning 100Mbps won't work either. Just speculation, but it seems logical. What else could you do other than let say 90 volts though instead of, what is it on the HV now, 65 or 70 volts? Or maybe some slightly slower reacting diodes? But I guess either case opens up the potential (pardon the pun) for damage. On 9/9/2016 7:16 PM, Chuck McCown wrote: You are correct, the POE version adds the transformer. From: George Skorup Sent: Friday, September 09, 2016 5:51 PM To: [email protected] Subject: Re: [AFMUG] Gigabit Ethernet on Cambium 450i only running 100Mbps Uh oh. I figured it out. It was as I suspected. The SS is clamping due to the sync pulse. Maybe the change that Forrest made with the Rev i0 SyncInjectors/PowerInjector+Sync because of the 450i's finicky handling of the pulse over long runs? I have no idea. So much for GigE + sync over power I guess. I don't have any Rev i0 Gigabit SyncInjectors to test with, but I assume I'd get the same result. I set the AP back to negotiate GigE. Turned off the sync on the injector port feeding that radio. Rebooted the AP. Link stays up at gigabit with no problems. Then I turned the sync pulse back on and the link dropped almost instantly. 18:33:42 interface,info ether6 link down 18:33:49 interface,info ether6 link up (speed 1G, full duplex) 18:33:53 interface,info ether6 link down 18:33:55 interface,info ether6 link up (speed 1G, full duplex) .... sync pulse back on 18:35:31 interface,info ether6 link down 18:35:34 interface,info ether6 link up (speed 1G, full duplex) 18:35:35 interface,info ether6 link down 18:35:42 interface,info ether6 link up (speed 1G, full duplex) 18:35:43 interface,info ether6 link down 18:35:46 interface,info ether6 link up (speed 1G, full duplex) 18:35:47 interface,info ether6 link down 18:35:52 interface,info ether6 link up (speed 100M, full duplex) The GigE-APC's I have at this site are definitely HV's. That's all I have ever ordered. They are all marked HV in sharpie on the handle. I'm feeding that cluster with regulated 24VDC from a RSD150C-24. On 9/9/2016 6:34 PM, George Skorup wrote: Uh.. hmm. I have a 5.7 450 sector running at a tower without any customers on it yet. It's powered and timed from a new GigE PowerInjector+Sync. GigE-APC-HV at the bottom. No SS on top. ~225 feet of Shireen 1042 cable. I just logged into it and set it to Auto 1000F/100F/etc. and rebooted. Does the same shit. 18:14:07 interface,info ether6 link down 18:14:20 interface,info ether6 link up (speed 1G, full duplex) 18:14:21 interface,info ether6 link down 18:14:26 interface,info ether6 link up (speed 1G, full duplex) 18:14:27 interface,info ether6 link down 18:14:30 interface,info ether6 link up (speed 1G, full duplex) 18:14:31 interface,info ether6 link down 18:14:40 interface,info ether6 link up (speed 100M, full duplex) I also just set it back to Auto 100F (disabling gigabit negotiation) and it does this... 18:21:34 interface,info ether6 link down 18:21:47 interface,info ether6 link up (speed 1G, full duplex) 18:21:48 interface,info ether6 link down 18:21:52 interface,info ether6 link up (speed 100M, full duplex) So, looks like the boot loader brings it up at 1Gbps, then the config makes it fall back to 100Mbps. This is also the first time that I tried messing with GigE on the 450 since updating from 13.2.1 to 14.1.2. This is a regular old RB1100. I have an Exalt ExtendAir G2-11 and an AF24 each running on a GigE-POE-APC and gigabit works fine. Chuck would have to say for sure, but I don't think there's much electrical difference between the GigE-APC-HV and the GigE-POE-APC. Besides maybe the gas-tube backup suppression and GigE transformer. Me thinks this has more to do with Cambium. On 9/9/2016 6:10 PM, George Skorup wrote: I upgraded two CRS125-24G-1S-RM's to 6.36.3 (current branch). Both brand new out of the boxes. Upgraded boot firmware to 3.33 on both. Reset both to defaults. Ether24 to ether24 linked up at 1Gbps FDX. Ran MT bandwidth tests between them. No issues. Then I put a GigE-APC-HV in between with a 50' patch cable on one side and a 10' on the other side. Tried with and without the ground attached. Ran more bandwidth tests. No link drops. No errors. So... I have no idea why you're having problems. The ones I have are definitely HV Rev A1's. On 9/9/2016 2:24 PM, Matt wrote: I have a couple CRS125's on my bench that I can mess with this afternoon if I have time. Do you have a GigEAPC-HV? My setup was CRS125 -<~50 foot UTP>-<GigEAPC-HV>-<20 foot UTP>- CRS125 -- Forrest Christian CEO, PacketFlux Technologies, Inc. Tel: 406-449-3345 | Address: 3577 Countryside Road, Helena, MT 59602 [email protected] | http://www.packetflux.com
