hybridfree/eevblog-posts huggingface dataset:
Bluetooth Module (Serial/UART) with SMA or External Antenna Connector - Page 1
Forum section: electronics / general

author: AJ3G
author_rank: Regular Contributor
timestamp: December 26, 2019, 02:47:24 pm
content: All:I have been looking around at my local vendors, and some online searching. I am looking for a Bluetooth Module I can mount in an existing product which has an external antenna connector. Ideally I would like the external antenna to be SMA, but its not mandatory. A lot of the products I am viewing have the antenna etched into the PCB, which is not what I am interested in, because I need to get as much of the RF Energy out of the enclosure of the product I am working on.I need SERIAL/UART I/O’s exposed to interface between the RXD/TXD pins of the existing product. I think a power level of 8 - 10dBm would be suitable, as I will be adding a separate external antenna which will provide some gain.I think the biggest problem I am having in my search is a good portion of what is available all seem to have Antenna integrated on the PCB. Is there some search term I can use to make sure I do not get results which show an external antenna?Thanks in advance!Rich

author: Lord of nothing
author_rank: Super Contributor
timestamp: May 14, 2020, 11:02:06 pm
content: http://www.senanetworks.com/the only BT Stuff with a external Antenna what I know.
Peer 2 peer video streaming over internet - Page 1
Forum section: electronics / general

author: veryevil
author_rank: Unknown
timestamp: April 15, 2020, 07:59:02 am
content: Hi, I'm wondering if it's possible to get video streaming working between 2 computers without a server on the net in the middle handling the video. Happy for a server to do negotiation but don't what video going up to server and back down.My thought is that firewalls on standard routers will not allow the incoming connection so I don't think it's possible. Hoping this is possible without any router config or ports opening.Any suggestions I can go research?Thanks

author: PA0PBZ
author_rank: Super Contributor
timestamp: April 15, 2020, 09:02:04 am
content: Microsoft Teams does that as long as there are only 2 participants. Both connect to the server first and then a connection is set up between the clients. When there are more than 2 participants the streams go to the server first and are distributed from there.

author: veryevil
author_rank: Unknown
timestamp: April 15, 2020, 09:54:51 am
content: Hi, I'm more interested in how to go about this not apps that do. Sorry I wasn't clear.Want to put this into a custom application running on 2 Linux machinesThanks

author: PA0PBZ
author_rank: Super Contributor
timestamp: April 15, 2020, 11:56:34 am
content: Yes, I got the idea that you were not looking for an App, but I wanted to point out that it is indeed possible. However, if you don't want to use an external server for the initial contact you might have to open some ports in the firewall.

author: veryevil
author_rank: Unknown
timestamp: April 15, 2020, 03:45:19 pm
content: NATTT doesn't come up with anything relevant that I can see?

author: RenThraysk
author_rank: Regular Contributor
timestamp: May 14, 2020, 02:06:14 pm
content: WebRTC is the tech for this,https://webrtc.org/built into the major browsers.Open source example of this ishttps://obs.ninja/https://github.com/steveseguin/obsninja

author: Lord of nothing
author_rank: Super Contributor
timestamp: May 14, 2020, 11:36:41 pm
content: VLC I guess?Depend what you want to do?
Hosting open Wifi AP on Tor or VPN? - Page 1
Forum section: electronics / general

author: NiHaoMike
author_rank: Super Contributor
timestamp: April 17, 2020, 04:50:36 am
content: With COVID-19 causing a widespread economic crisis, including poorer households being pushed to conserve money, the idea of richer/less poor individuals sharing their Internet service with less fortunate neighbors has come about. Then I thought that rather than just putting up an open AP directly on your network with all the potential problems it could cause, what if the AP was hosted on Tor or VPN? If I understand correctly, done right it will isolate your private network from the outside world and misuse would not be traced to your home IP.I have no plan to actually put up an AP like that, but it's still an interesting idea to think about. How good of an idea would it be really? Would a "ready to go" image (that is specifically designed to be secure against attackers on the open AP) for low cost computing platforms like Raspberry Pi and low end OpenWRT routers be useful to allow the less technically inclined to help their neighbors?

author: OwO
author_rank: Super Contributor
timestamp: April 17, 2020, 05:34:13 am
content: It just shifts the problem elsewhere because someone still has to run the exit nodes. I say set up WPA enterprise instead and only give accounts to people you know.

author: David Hess
author_rank: Super Contributor
timestamp: April 17, 2020, 11:40:03 am
content: I would host it on a VPN and have plans to do exactly that; doing so avoids legal entanglements. The only disadvantage is that some sites do not allow access via a known VPN.

author: NiHaoMike
author_rank: Super Contributor
timestamp: April 17, 2020, 10:52:51 pm
content: Quote from: OwO on April 17, 2020, 05:34:13 amWhich are run by operators already in a good position to avoid trouble from abuse. I would have to guess that piracy will also be up as a result of cutting costs and open APs would practically be lightning rods for pirates who want to avoid getting caught.Quote from: David Hess on April 17, 2020, 11:40:03 amI'd imagine very, very few would cancel their Internet service before their streaming services, especially when lots of public areas are closed.

author: Doctorandus_P
author_rank: Super Contributor
timestamp: April 29, 2020, 08:58:00 pm
content: Just made me wonder if "fon" still is a thing...https://fon.com/maps/Apparently it is, especially in "some" parts of Europe, Japan and South Korea Brazil and the Australian east coast.
Simple wireless stack for nRF24L01, CC1100, CC2500 and similar transceivers - Page 1
Forum section: electronics / general

author: Warhawk
author_rank: Frequent Contributor
timestamp: April 27, 2020, 01:16:00 pm
content: Guys, does anyone know about an open-source wireless stack for cheap 2.4GHz and sub-GHz devices?SimpliciTI is the closest I could gethttp://www.ti.com/tool/SIMPLICITIbut I am wondering if there are more.I don't want to reinvent the wheel. I would need a simple multi-sensor communication.
Alter memory program for a CSR BC57E687C BlueCore5 firmware  - Page 1
Forum section: electronics / general

author: satoshi
author_rank: Contributor
timestamp: January 15, 2020, 01:32:07 am
content: I paid a custom firmware for a CSR Bluetooth Chip: BC57E687C and our supplier decided to stop manufacturing the module, all of a sudden. They never shared the software with us. We are thinking about overcoming this problem by integrating the BC57E687C into our PCB as we were able to extract the customised firmware (firmware link) with BlueFlash from CSR but we are not able to alter the Bluetooth Address. If we alter the Bluetooth Address using PSTool, the CSR won't boot up. The BC57E687C implements a Harvard architecture and I am able to see the bluetooth address in the memory data (XDV file) from the firmware so I have tried to edit the Bluetooth address directly on the XDV file and download it into the BC57E687C. The flash contains exactly the expected data but when I turn the MCU on, the section of the flash where the Bluetooth Address is located is wiped out and the Bluetooth won't boot up. The MCU detects the modification somehow.I discovered the XDV file has three well differentiated sectors at @000100, @002000 and @004100. I have extracted the firmware from four modules and the sections @000100 and @004100 from the XDV are equal. They only differ on the @002000, this section is precisely where the Bluetooth Address is and the section that gets erased when downloading a modified XDV. The program data (XPV) is equal for all the extracted firmwares and I can flash any of the firmwares in any module interchangeably without any issues.I tried to analyse if there is any checksum or CRC in the whole flash or if there's any check per sections but I can't seem to find any pattern.I'm trying to change the Bluetooth address 009a e0c0 0043 001d (located at @0028e0 and @0028fb) from the firmware attached to the addrss 009a e073 0043 001d (a random modification).There is so little information from CSR and I think it is especially true now that CSR was acquired by Qualcom. Maybe someone here has experience with the now old CSR BlueCore5 and can help me out. This component is part of one of our products and we need to keep producing it at least until we can develop our own firmware, but that will take time.

author: TomS_
author_rank: Frequent Contributor
timestamp: April 20, 2020, 10:02:12 am
content: Sounds like there may be some kind of checksum involved in the block of data where the MAC address is contained. If the checksum doesnt match then perhaps it wipes out that data and it needs to be reloaded another way?How you will figure out the checksum algorithm and where the checksum is stored etc may not be easy.Perhaps have discussions with the manufacturer about this and see if they are willing to help.
Tell me about RJ45 Panel connectors, Infinite between in and pcb pins. - Page 1
Forum section: electronics / general

author: Qmavam
author_rank: Regular Contributor
timestamp: April 19, 2020, 02:34:23 pm
content: I pulled a panel mount RJ45 connector from an old Linksys router to use in a non data digital data project*. Just for kicks I wanted to make sure that the input pins were in the same order as the pcb pins. There is no connect between the in and the out! It seems I'm unfamiliar with how they work, to say the least. I removed the metal case from the panel mount, First thing I noticed there was thin grounding wire soldered to the inside of the case, that I broke. Then I notice four tin potted toroids inside the connector. Pin 1+2 or soldered together.I suspect the toroids are transformers and that is why I don't see any connection from input to output. Tell me what going on.My project needs direct straight through connections and I'll try to dig out the potting put if that fails, I'm looking at an Amazon product,https://www.amazon.com/gp/cart/view.html?ref_=nav_cartWould this have the same arrangement with the toroids?Thanks, Mikek* I'm running RF and DC on the twisted pairs.

author: madires
author_rank: Super Contributor
timestamp: April 19, 2020, 02:54:48 pm
content: The RJ45 sockets you've taken from the router have the Ethernet magnetics integrated. What you want is just the plain RJ45 socket which is also less expensive.

author: WattsThat
author_rank: Frequent Contributor
timestamp: April 19, 2020, 04:17:29 pm
content: OP: no one can see the items inyourAmazon cart

author: Qmavam
author_rank: Regular Contributor
timestamp: April 19, 2020, 07:00:03 pm
content: [ Specified attachment is not available ]Well That's a revolting development!https://www.amazon.com/gp/product/B009CZGJVS/ref=ox_sc_act_title_1?smid=A7QNKLNRR5QSB&psc=1Or thishttps://www.ebay.com/itm/NEW-Assmann-WSW-Components-A-RJ45KU-R-Waterproof-Panel-Mount-Jack-Set-of-5/163619270179?hash=item261877ee23:g:x98AAOSwKLxbXOuJI did remove all the components and PCB then ran wires to complete the connections from in to out. It's not pretty, but no shorts.Mikek

author: TomS_
author_rank: Frequent Contributor
timestamp: April 20, 2020, 09:42:49 am
content: Those look like they are meant to be a stand alone socket at the end of a length of cable, e.g. on a wall plate. This is evidenced by the IDC terminals on the rear side. So probably they dont contain integrated magnetics.Sockets with integrated magnetics would only be found in active electronics, ala your router, perhaps where space on the PCB is a real concern.Raspberry Pi uses sockets with integrated magnetics due to space constraints. I believe at one point they had an issue where sockets without magnetics were assembled onto boards, and resulted in the ethernet ports not working correctly.
Ble device power consumption measurement - Page 1
Forum section: electronics / general

author: roavmf
author_rank: Newbie
timestamp: September 04, 2020, 05:32:21 pm
content: Hello,I have used both the power profiler kit (https://www.nordicsemi.com/Software-and-tools/Development-Kits/Power-Profiler-Kit) from Nordic and the power shield (https://www.st.com/en/evaluation-tools/x-nucleo-lpm01a.html) from STM to measure power consumption of a BLE device. Both the power profiler kit and the power shield are under $100 USD and easy to use, but they are lacking slightly for my needs.The Nordic one can measure up to 70mA and works well but cannot export the measurement data, and it seems that the STM one can export measurement data but can only measure up to 50mA and that is not sufficient. I've seen the OTII device which is too expensive.I am hoping that Nordic would add a data exporting feature to their power profiler software, but are there any alternative ways?Their previous software (https://devzone.nordicsemi.com/f/nordic-q-a/49641/exporting-data-from-ppk) had an exporting feature but the previous software doesn't work as well as their current version.

author: whims
author_rank: Newbie
timestamp: January 13, 2021, 07:55:32 am
content: Their new software supports exporting
Blackbox with a USB/LAN connection - Page 1
Forum section: electronics / general

author: MathWizard
author_rank: Super Contributor
timestamp: March 17, 2020, 12:15:23 pm
content: If you have a USB/LAN capable device, like say an oscilloscope, what are some programs to have, to see exactly what the device is TXing. And for doing stuff like 'telenetting into a device', name some programs to get for poking around. Wireshark? How do u get inside to see what files are in it ?IDK to learn a week of programing today, I just want to start poking around, get my interest up, as I learn some more on the programing side. Even just learning some lingo from some playing with some program today would be good.

author: MathWizard
author_rank: Super Contributor
timestamp: March 17, 2020, 12:49:39 pm
content: I think with wireshark recoding, I just spoke to port111 of my Siglent SPD3303X-E, with PuTTy in telnet mode, and didn't get an error for the 1st time, or a bunch of red in wireshark. But now IDK what to do.

author: MathWizard
author_rank: Super Contributor
timestamp: March 17, 2020, 12:59:15 pm
content: HAHAHAHA I did it, before I used the USB to try FW upgrade to 3303X, this time I had wireshark recording and tried the hack procedure over LAN, and it did it.The PSU now has 3 decimal placesWOO HOO

author: thm_w
author_rank: Super Contributor
timestamp: March 18, 2020, 10:03:30 pm
content: wireshark is all I've used for monitoring. If you want to monitor between other devices, a 10mbps passive hub can be used, or other options mentioned here:https://wiki.wireshark.org/CaptureSetup/Ethernetnmapis useful for poking to see what ports are open.
[SOLVED] Can anyone identify what this hardware key is for? - Page 1
Forum section: electronics / general

author: gnif
author_rank: Unknown
timestamp: June 28, 2020, 07:35:24 am
content: I was given a box of fiber optic stuff and this was included, I believe it may have some value if I can identify what it's from.The sticker states that it enables "Multirate Capability", clearly for a fiber switch.

author: Rerouter
author_rank: Super Contributor
timestamp: June 28, 2020, 07:46:12 am
content: looks like a 1 wire dallas eeprom / ID puck, they can be read and even copied like a generic eerprom, but the unique identifier is what makes them harder to clone.

author: PA0PBZ
author_rank: Super Contributor
timestamp: June 28, 2020, 08:56:33 am
content: "3200 HW KEY T1 FOR M-RATE CARDS"https://telasys.com/product/02mbb00007aac/"The Marconi OMS 3200 (also known as the Ericsson OMS 3200) Optical MultiService Core Switch"You'd know if you had one:

author: gnif
author_rank: Unknown
timestamp: June 28, 2020, 09:57:46 am
content: Awesome, thank you!

author: bitwelder
author_rank: Super Contributor
timestamp: June 29, 2020, 01:46:08 pm
content: Sorry for the off-topic, but when I click on the small picture in gnif's post (which looks related what he's talking about in the post) I get as larger picture... the one used in this eBay announcehttps://www.ebay.co.uk/itm/Vintage-Victor-Micronic-Handheld-Computer-Products-M250-Portable-Data-Entry-Unit-/264163021950Is it just me?

author: syau
author_rank: Frequent Contributor
timestamp: June 29, 2020, 02:32:39 pm
content: Quote from: bitwelder on June 29, 2020, 01:46:08 pmI have the same issue.

author: PA0PBZ
author_rank: Super Contributor
timestamp: June 29, 2020, 02:35:16 pm
content: Gnif - by pure coincidence- is working on that problem, it manifests in several threads.
4g router in steel shed - Page 1
Forum section: electronics / general

author: merser
author_rank: Contributor
timestamp: January 26, 2020, 01:30:50 pm
content: Hi,I have had to resort to 4g internet via mobile router connected to a yagi aerial on my shed since moving to the country in SE Qld.The signal is very sketchy at times but I mostly do get 3 bars which gives reasonable service.What I can't understand is why I lose connection when I have it all closed up.This doesn't affect the signal on the router but it seems the laptop loses communication with the router.I thought maybe because the shed is steel with aluminium bubble wrap insulation its having an effect on the wireless. But I tried tethering with usb cable and its the same.Has anyone had an experience like this and found the solution?

author: m98
author_rank: Frequent Contributor
timestamp: January 26, 2020, 10:12:12 pm
content: You have a Yagi feeding an LTE modem in your shed via coax? (BTW, your modem probably has two antenna ports, you should use two antennas with their polarization planes at a right angle to get a much higher data rate)Have you tried placing the modem right next to the antenna with a short cable, and than route a LAN cable inside your shed? If you're currently connecting via USB, long USB cables tend to be susceptible to interference, especially if they aren't of the best quality, and you shouldn't go longer than ~5 meters with USB 2.0 without an active repeater.
"cheap" Multi WAN Box who send 1 Packet truth all WAN Interfaces? - Page 1
Forum section: electronics / general

author: Lord of nothing
author_rank: Super Contributor
timestamp: January 07, 2020, 11:13:28 pm
content: HiI looking for a "Cheap" Router who can send 1 Packed over all WAN Interface and on the other end the Same Router pick that Package who arrive first and the other "copys" get troth away. The simple reason is I want pust a Live Video Stream truth all Cell Phone Company (3 in total).I talked to them and thedontoffer me a Guaranteed Uplink and for Sat I am not insane and Rich enough. Sadly when I am Abroad from Home Hotels and so have normally not the Bandwith for.Thanks
STM32 L476RG Nucleo Board and LoRaWAN - Page 1
Forum section: electronics / general

author: CalMachine
author_rank: Frequent Contributor
timestamp: December 06, 2019, 07:28:21 pm
content: I'm trying to play around with LoRaWAN communication and am hitting a few roadblocks using the ST's LoRaWAN stack. I've successfully implemented the Chirpstack.io Network bridge, Network server, and Application server on an RPi4. As for the gateway, I'm using a LAIRD Sentrius RG191 8 channel gateway.One main issue I'm currently observing is the nucleo board only seems to want to send a maximum of 7 uplinks before the stack seems to fail or timeout. I'm also having a hard time trying to figure out how to properly define the channel map I'd like to use, which I defined on the gateway.I've gone over the UM2703 many times and I'm not finding any relevant information. Software is not my forte, so any help or advice would be great

author: I wanted a rude username
author_rank: Frequent Contributor
timestamp: December 06, 2019, 08:32:27 pm
content: Could it be a rate limit? There are some strict daily limits in certain jurisdictions, and the library may enforce them (though this does seem unlikely, as it would need to be time-aware).

author: CalMachine
author_rank: Frequent Contributor
timestamp: December 06, 2019, 08:51:16 pm
content: Quote from: I wanted a rude username on December 06, 2019, 08:32:27 pmI've contemplated that may be the issue, but it hits that 7 message limit whether I have it sending an uplink once every 10 seconds or once every 10 minutes.I think I'll let the nucleo board run over the weekend and see if I can see the stack fire off messages again after a day or so after it seems to shut down.I'm monitoring the uplink and downlink frames on the 'life lorawan frames' page on the chirpstack interface, as well as the STM32's serial output on tera term
nRF24L01 network for widespreaded sensors - Page 1
Forum section: electronics / general

author: RoGeorge
author_rank: Super Contributor
timestamp: November 27, 2019, 04:43:56 pm
content: Is there any sort of network/protocol for nRF24L01 that can forward lost packets to other nodes, in the hope that all packets will finally arrive to their destination?The goal is to have 10-100 sensors that can report each at most 10-100 Bps cummulated in 2-3 packets a second, preferably a master slave architecture, so the sesnsors won't Tx while not interrogated.It's easy when all the slave sensors are in the master's range, but some nodes will always be too far away for a direct connection with the master, so the far away nodes will need from their closer neighbors to retransmit the lost packets.Any ideas how to collect a low throughput of data coming from a widespread mesh of sensor nodes based on nRF24L01?

author: ebclr
author_rank: Super Contributor
timestamp: November 27, 2019, 06:00:20 pm
content: nRF24L01 isn't the best choice, look for SX1278 modules

author: MarkF
author_rank: Super Contributor
timestamp: November 28, 2019, 01:16:12 am
content: https://howtomechatronics.com/tutorials/arduino/how-to-build-an-arduino-wireless-network-with-multiple-nrf24l01-modules/
Itek wireless N 150Mbps - Page 1
Forum section: electronics / general

author: m2019
author_rank: Newbie
timestamp: November 19, 2019, 11:03:00 am
content: Hello friends! I cannot access the menu of this unit. I would like to configure it with wiffi signal repeater. Every help is welcome.thanks!

author: m2019
author_rank: Newbie
timestamp: November 19, 2019, 11:03:51 am
content: photo 2
Starlink 1 - Page 1
Forum section: electronics / general

author: iMo
author_rank: Super Contributor
timestamp: November 12, 2019, 06:45:48 pm
content: A SpaceX Falcon 9 rocket launched the second batch of 60 satellites for SpaceX’s Starlink broadband network, a mission designated Starlink 1.https://en.wikipedia.org/wiki/Starlink_(satellite_constellation)

author: wraper
author_rank: Unknown
timestamp: November 12, 2019, 06:50:47 pm
content: Your link is broken, last bracket in not part of the link.BTW posting links without giving any comment is lame.

author: Monkeh
author_rank: Super Contributor
timestamp: November 12, 2019, 06:58:51 pm
content: You could just fix it.https://en.wikipedia.org/wiki/Starlink_(satellite_constellation)

author: wraper
author_rank: Unknown
timestamp: November 12, 2019, 07:01:00 pm
content: Quote from: imo on November 12, 2019, 06:53:39 pmUse insert hyperlink if simply copying link does not work.https://en.wikipedia.org/wiki/Starlink_(satellite_constellation)Deployment ar 1:15:00
Are FINISAR optical Transceivers Cisco Nexus compatible? - Page 1
Forum section: electronics / general

author: HoracioDos
author_rank: Frequent Contributor
timestamp: October 22, 2019, 01:28:16 pm
content: Hello.I don't know if it is the right place to ask.Does anyone have any experience using a FINISAR FTLX1475D3BCL 10Gb optical transceiver with a Cisco Nexus 5672UP Switch? Are these transceivers compatible with CISCO? We already asked for an answer in CiSCO without success.Thanks in advance!

author: Black Phoenix
author_rank: Super Contributor
timestamp: October 22, 2019, 04:15:42 pm
content: They should.

author: TomS_
author_rank: Frequent Contributor
timestamp: October 24, 2019, 11:45:57 am
content: Theres a good chance that Cisco sources their own brand transceivers from someone like Finisar, but with their own part numbers etc.In the old days, to make a non-Cisco branded optic work in one of their boxes you would use the "service unsupported-transceiver" command to make it "ignore" the fact it wasnt a Cisco optic. I dont know if that works on a Nexus, its been some time since I have worked with Cisco on a daily basis (long enough that I havent actually worked on a Nexus box at all...)Otherwise, I would suggest you go to something like the cisco-nsp (c-nsp) mailing list and ask. If you cant already find the answer by searching the archives, someone will probably give you an answer quicker than here.

author: HoracioDos
author_rank: Frequent Contributor
timestamp: October 25, 2019, 08:45:13 pm
content: Hello @TomSThey finally worked, but we had to run "service unsupported-transceiver" as you said. Cisco wanted to scare us with this message after that."Warning: When Cisco determines that a fault or defect can be traced to the use of third-party transceivers installed by a customer or reseller,then, at Cisco's discretion, Cisco may withhold support under warranty or a Cisco support program. In the course of providing support for a Cisco networking product Cisco may require that the end user install Cisco transceivers if Cisco determines that removing third-party parts will assist Cisco in diagnosing the cause of a support issue."While digging in Cisco forum we found this.Q. Do the Cisco Switches interoperate with SFPs from other vendors?A. Yes, starting from 12.2(25)SE release, the user has the option via CLI to turn on the support for 3rd party SFPs. However, the Cisco TAC will not support such 3rd party SFPs. In the event of any link error involving such 3rd party SFPs the customer will have to replace 3rd party SFPs with Cisco SFPs before any troubleshooting can be done by TAC.
Connector diameter size and cable size need help. (newbie in networking cabling) - Page 1
Forum section: electronics / general

author: TuxKey
author_rank: Regular Contributor
timestamp: July 29, 2019, 04:24:02 pm
content: Hi guys,i'm looking to buy "Pass-Through Ethernet Crimper and Connectors" from Aliexpress and sum cat6 ftp cable from The Netherlands but i have one question that i can't get answered by the aliexpress seller because of the language barrier.these are the connectors i want to buy:https://www.aliexpress.com/item/32827360505.html?spm=a2g0s.8937460.0.0.21942e0eCyWjfgand this is the cable i want to buy:https://www.utp-kabel.nl/cat6-kabels/danicom-cat6-op-rol/danicom-cat6-ftp-50m-op-rol-soepel-pvc-fca.htmlconnector info alliexpress site:scrolling down the page it states that the cable diameter must be less then 6.5mm that's for the outside diameter since the cable i want to buy is 6.1mm this should be ok..it also mentions "1 of 8 lines diameter must be less then 1.05mm" and it shows a picture of a caliper measuring one of the cable strands.The cable manufacturerhttps://www.utp-kabel.nl/amfilerating/file/download/file_id/3096/states the cable is 26AWG i assume that's for the inner strands looking at a table 26AWG is 0.405mm so well under the 1.05mm of the connector..One thing that confuses me is that on other stores they sell connectors stating 26AWG but that's not the connectors i want so that's no use but that made me unsure of these connectors and if they would fit..Any help would be appreciated..if you care to know i'm planning on buying one of these crimper'sNot sure why one is €25 and the same one from a different seller on aliexpress costs €15 that's something i need to figure out..think i'l go with the more expensive one as i'm getting the connectors from there but need to think about that one..€15 one:https://www.aliexpress.com/item/32967336545.html?spm=a2g0s.8937460.0.0.21942e0eCyWjfg€25 one:https://www.aliexpress.com/item/32658564281.html?spm=a2g0s.8937460.0.0.21942e0eCyWjfg

author: soldar
author_rank: Super Contributor
timestamp: September 18, 2019, 06:46:13 pm
content: Interesting connectors, they allow you to see the wire and even pull on it before you complete the crimping and cut off the excess. I have never used them. For me crimping Ethernet connectors is a boring and tedious job which I do when I have time to kill. I have found pretty much all connectors work with the crimp tool I have but I do not know if it is just sheer luck. I have even managed to crimp without the tool, just pushing the pins in one by one with a flat screwdriver.What I hate is lazy people who do not properly secure the outside plastic sleeve, only the wires, and the wires break after some flexing. Arghhh...
Mounting Hot Switches in A Rack - Page 1
Forum section: electronics / general

author: German_EE
author_rank: Super Contributor
timestamp: September 06, 2019, 07:30:45 am
content: I sometimes do some network admin for a local organization, they have a 48-port Dell switch and two 48-port patch panels that are gradually filling up as they expand. They now need a second switch identical to the first and in most network installs I have seen the switches are grouped together at the top, however, these Dell units run hot and I already have a 150mm fan cooling the rear of the case. So, do I.........a) Mount the two switches together like everyone else does and hope that the heat does not become a problem.b) Mount the two switches at the top but with a 1U gap between them for ventilation, this sounds ideal but it will mean purchasing A LOT of longer patch cords. The fan will probably be able to cool them like this but I am not sure.c) Mount one switch at the top, the patch bays in the middle, and the second switch at the bottom. I then need to get creative and find a way to mount a fan to cool the second switch.Please explain your answer.

author: Ian.M
author_rank: Super Contributor
timestamp: September 06, 2019, 08:44:09 am
content: If the switches are both on the same LAN, alternate:SwitchPatch panelSwitchPatch panelIt keeps most of the patch wiring as short as possible and gives you the air space you need between the switches for ventilation + is extendible in future. You may need an extra 1U gap for a heat deflector over the bottom switch if they have truly lousy thermal management, or if its a glass door rack, may even have to resort to fans and filters feeding an air plenum at the bottom of the rack with ducts up to the back of each switch.

author: German_EE
author_rank: Super Contributor
timestamp: September 06, 2019, 03:29:03 pm
content: Yes, the Dell switches do have really bad thermal management. Without that fan I estimate that the rear right of the case is somewhere between 50C and 60C as I can only just put my hand on it. The switch CPU is running at about 20% of full load so I suspect that this is a power supply issue.Thanks for the tip, switch,panel,switch,panel sounds logical and they get to use all of their existing patch leads.
pic18f2550 with HC-05 - Page 1
Forum section: electronics / general

author: MAD MACRO
author_rank: Regular Contributor
timestamp: September 08, 2019, 09:58:22 pm
content: I'm using a pic 18f2550 and HC-05 bluetooth module, i'm running into a minor issue, but it's very hard to debug.I'm sending and receiving data successfully, but there's always 2 extra characters being sent after the transmission from another device(my android phone)I tried to send it back to myself, and i end up with an endless buffer of undefined characters that get to be represented by the app with the letter y with 2 dots on top of it.Here's the code:https://github.com/wamry/bt-firmwareJust run commandmaketo build, ormake flashto build and program the chip
Audio over Bluetooth - Page 1
Forum section: electronics / general

author: YU7C
author_rank: Regular Contributor
timestamp: August 01, 2019, 07:42:01 pm
content: Hi,I need to transfer full audio signal (16bit 20Hz - 20kHz) from Microphone to Windows PC application over Bluetooth, and have selected Microchip BM62 Wireless module.At the begining everthing goes flawless: BM62 paired with BT adapter, connected and got BT microphone in Sound.I got several BT services: Audio Sink, Handsfree Telephony, Headset,...But audio BW is imited to about 4kHz which told me that only HFP/HSP works, not A2DP.If I select only A2DP on BM62, then Audio Sink service is only avaliabled but there is no sound from micropne.I have connected elecret capsule on the microphone input of BM62.Perhaps I need line input on BM62 for A2DP audio quality signal?Does anyone has experinces with BM62?Thanks,Vojislav

author: YU7C
author_rank: Regular Contributor
timestamp: August 02, 2019, 04:51:41 am
content: Quote from: blueskull on August 01, 2019, 07:50:19 pmCan I use a line input for audio streaming and A2DP profile?Thanks,Vojislav

author: YU7C
author_rank: Regular Contributor
timestamp: August 02, 2019, 05:51:43 am
content: Ok, but anyway I need only one way path, from the device to PC. If it is not possible have to looking for other solution.Thanks,Vojislav

author: Jeroen3
author_rank: Super Contributor
timestamp: August 02, 2019, 06:06:16 am
content: Not only that. A2DP is also compressed, and receiving a2dp is not possible on Windows.
How do I set my wifi adapter to monitor mode in Windows? - Page 1
Forum section: electronics / general

author: Ben321
author_rank: Frequent Contributor
timestamp: July 05, 2019, 07:53:09 pm
content: In WireShark software there's promiscuous mode, which lets you monitor all packets on the currently connected wireless network (rather than just those intended for your computer). But there's another mode also that some cards support, but others don't it seems (and mine might not it seems), and this mode is called monitor mode. In this mode, it a network card receives all wi-fi packets, not just those associated with the currently connected network (and I don't even think that a network card can connect to a network the standard way when in monitor mode). However, I don't think most cards support monitor mode (at least not in Windows, but I heard that it's easier to do in Linux).Now here's what I'm not completely sure about, regarding monitor mode in Windows (and yes, I've heard that it is possible). I have NPCap installed (equivalent to WinPCap, but for Windows 10 that doesn't support the WinPCap driver), and I know it supports promiscuous mode, but I don't know if it is capable of enabling monitor mode in wifi adapters that support monitor mode, or if I need to install a special hacked driver for that specific wifi adapter to replace its normal driver in order to enable monitor mode.And one more thing. How do I know if my wifi adapter is even capable of running in monitor mode? Is there some simple software I can run that query's a wifi adapter's capabilities, and then reports if it supports monitor mode?

author: gmb42
author_rank: Frequent Contributor
timestamp: July 06, 2019, 02:06:48 pm
content: The Wireshark Wiki page onWLANCapturing is a good resource on the general issues of WiFi capture.For npcap in particular, the user guide hasthissection dealing with monitor mode.The nmap folks maintain alistof adaptors of WiFi adaptors tested with npcap and their capabilities.

author: Ben321
author_rank: Frequent Contributor
timestamp: July 08, 2019, 07:48:07 pm
content: Quote from: gmb42 on July 06, 2019, 02:06:48 pmWill I also need to do something like install a hacked version of Windows' normal ethernet driver, or somehow upload a hacked firmware to the network card itself?

author: gmb42
author_rank: Frequent Contributor
timestamp: July 09, 2019, 12:29:44 pm
content: If it's on the npcap list, then no (apart from the Alfa AWUS036NHA (Atheros AR9271)).If it's not on the list, then there might be some options with drivers\firmware to enable it, but you're clutching at straws.Linux generally has better support.
DIY sim modem - Page 1
Forum section: electronics / general

author: Enrico
author_rank: Newbie
timestamp: June 24, 2019, 06:25:58 pm
content: I'm starting a new project in wich i'd like to make my own sim router since the commercial ones are getting quite expensive.i was looking to lcsc website for modules that i can use and i was thinking of using a SIM800C for sim internet connectivity, and then using an esp32 to generate a wifi signal that a user can connect to to get to the wonders of internet.I've already read trougth the full datasheet and i didn't find any explanations of how to get on the internet and such, so now i'm wondering if it's even possible . . .Could you help me to understand?And if you know some, shouw some sample code?thanksenrico

author: GromBeestje
author_rank: Frequent Contributor
timestamp: July 05, 2019, 11:38:47 am
content: I suppose you could use something like lwip (https://savannah.nongnu.org/projects/lwip/) which support PPPoS.In this case you want to do a PPP session, rather then let the modem handle the sockets, as you want to forward data from the wifi.Then, first you initialise your modem, (things like unlock the SIM, connect to the network, enable data, set the APN, etc)Then do a dial to start a PPP session, and hand over the serial communication to lwip, and lwip should handle the internet connection.I don't know much about the ESP32 network layer, but you should basically implement some router that routes between the WiFi and the connection handled by lwip. If the WiFi end of the ESP32 can be fed into lwip, lwip should be able to handle this for you. I recall reading the ESP8266 SDK contained some lwip fork, so I can imagine this possibility exists.WHen googeling for this, I foundhttps://github.com/loboris/ESP32-PPPOS-EXAMPLEIt mentionsQuoteso this might already do what you're looking forIf that is the case, it boils down to sending the modem the right initialisation commands, hand it over to lwip, and let lwip handle the routing.
[Networking] Small Business Networking with macOS - Page 1
Forum section: electronics / general

author: blueskull
author_rank: Unknown
timestamp: May 27, 2019, 12:41:29 am
content: I'm preparing to start a consulting startup in China, and this question is about its internal networking.Here is a list of features that I need:1. WiFi access to both internal and guest networks, internal using certificates, and guest using passwords.2. Isolated zones (guest, internal, test gears, process control), with internal having access to all but guest, and guest has access to nothing but Internet.3. Internal network can access an external VPN server to circumvent great firewall, and internal network has its own VPN server to allow working from home.4. Test gear network and process control network can receive incoming connections from internal, but not initiate connections to internal, except for certain DMZ rules.5. All services and employee computers are on internal network.-----------------------------------------I made an illustration for this, and my question is, is this achievable with macOS (with Server app, but without a Linux VM)?Red is danger, green is safe, other colors are different zones that shouldn't access the green zone, but should also not be accessed from the red zone.

author: sokoloff
author_rank: Super Contributor
timestamp: May 27, 2019, 02:23:05 am
content: I would treat this as a networking issue, define VLANs for each use, and use a router to enforce separation of networks as desired.I run Ubiquiti gear at home, and it’s well capable to do what you are describing. It’s also fairly easy and low-fuss once configured. Other brands of pro-sumer level gear could do it as well. (Aero, Meraki, Ruckus, Cisco, etc)Then the Mac becomes just a client on the network you assign it to.

author: sokoloff
author_rank: Super Contributor
timestamp: May 27, 2019, 02:24:26 am
content: Google VLAN and watch a few videos, then get a VLAN capable switch, router, and WiFi access points. This is not really a MacOS question, at least as I understand the question.

author: lty1993
author_rank: Unknown
timestamp: May 29, 2019, 01:18:22 pm
content: Running routing, firewall, and NAT on macOS?"The problem is, a managed smart ROUTER (not just an L2 switch) running at 10Gbps is gonna be expensive."Why you need a 10Gbps router? Your router only needs to match your uplink speed. You can get a cheap second-hand L3 switch couple hundred CNY in China (Juniper EX4200-48T / EX2200-48T[No IPv6 Routing] / Cisco C3750X). If you need 2 or 4 10G uplink port, you can get higher end one for less than 2000 CNY (Juniper EX3300-48T / Cisco C3750X with 10G module / Juniper EX4200-48T with 10G module). If you need POE on the switch, most Juniper and Cisco switches come with POE models which cost couple hundreds CNY more (Juniper EX3300-48P / Juniper EX4200-48P / etc). It can do everything you need except NAT, which you can use a cheap router to do it (Mikrotik hEX Gr3).
Bluetooth amplifier pairing problem - Page 1
Forum section: electronics / general

author: Pexy13
author_rank: Regular Contributor
timestamp: June 01, 2019, 10:17:49 pm
content: Greetings!I ordered a 3w bluetooth amplifier from ebay for a little project but i can't connect my phone (LG V30)to it.It can see it but but it doesn't want to connect to it. When I tried the same thing with my dads iphone 7 it connected and worked perfectly.What is the cause of this and how can I fix it?This is the amplifier moddule:https://www.ebay.com/itm/3W-2-Bluetooth-Audio-Receiver-Mini-Digital-Amplifier-Board-Module-Micro-USB-I8H4/163597127953?hash=item2617261111:g:BKQAAOSwjXZciNVs&enc=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&checksum=163597127953257dd0626b6c4c2baa51c2a4d5588a33Thanks!
new Spectre-like attack: VMScape - Page 1
Forum section: electronics / general

author: madires
author_rank: Super Contributor
timestamp: September 11, 2025, 07:47:02 pm
content: Media:- New VMScape attack breaks guest-host isolation on AMD, Intel CPUs -https://www.bleepingcomputer.com/news/security/new-vmscape-attack-breaks-guest-host-isolation-on-amd-intel-cpus/- Spectre haunts CPUs again: VMSCAPE vulnerability leaks cloud secrets -https://www.theregister.com/2025/09/11/vmscape_spectre_vulnerability/Researchers:- VMScape: Exposing and Exploiting Incomplete Branch Predictor Isolation in Cloud Environments -https://comsec.ethz.ch/research/microarch/vmscape-exposing-and-exploiting-incomplete-branch-predictor-isolation-in-cloud-environments/Affected CPUs:- AMD Zen 1 to 5- Intel Coffee Lake

author: SiliconWizard
author_rank: Super Contributor
timestamp: September 11, 2025, 08:21:42 pm
content: It has been quickly addressed in Linux 6.16.7 - provided that the fix actually works.

author: madires
author_rank: Super Contributor
timestamp: September 12, 2025, 09:15:37 am
content: And in kernel 6.12.47 (released yesterday).
Millions of Dell laptops at risk due to Broadcom chip security flaw  - Page 1
Forum section: electronics / general

author: bingo600
author_rank: Super Contributor
timestamp: August 06, 2025, 02:42:06 pm
content: https://www.techradar.com/pro/security/millions-of-dell-laptops-at-risk-due-to-broadcom-chip-security-flaw-heres-how-you-can-stay-safehttps://www.dell.com/support/kbdoc/en-us/000276106/dsa-2025-053

author: voltsandjolts
author_rank: Unknown
timestamp: August 06, 2025, 02:45:24 pm
content: Meh, needs physical access.

author: Zucca
author_rank: Unknown
timestamp: August 06, 2025, 02:46:43 pm
content: Probably we will all save time by reporting only the few unknow successes by Broadcom, by default this company only produces rotten shit.This is my reaction when I hear Broadcom:

author: Halcyon
author_rank: Unknown
timestamp: August 08, 2025, 12:27:46 am
content: Quote from: Zucca on August 06, 2025, 02:46:43 pmOne word sums up how utterly terrible Broadcom are: VMware.

author: RoGeorge
author_rank: Super Contributor
timestamp: August 08, 2025, 07:50:16 am
content: Not sure if that's a chip flaw, since it can be fixed by a firmware update, and also, the attacker requires physical access to your laptop. Unpleasant yes, but highly unlikely to happen to the casual user.

author: sportinator
author_rank: Newbie
timestamp: August 13, 2025, 02:05:46 pm
content: If not for this forum, I would never have checked the issue. Thank God my laptop is not affected

author: radiolistener
author_rank: Super Contributor
timestamp: September 10, 2025, 11:50:49 am
content: Quote from: RoGeorge on August 08, 2025, 07:50:16 amIt resembles theBroadpwnvulnerability affecting BCM43xx chips, which allows arbitrary code execution on the target device remotely, without requiring physical access. As far as I recall, the firmware is stored in the chip’s ROM memory, while the OS may upload temporary patches into RAM at each boot. Therefore, if the patch isn’t applied (for example - loaded another OS, with no patch), the device continues to run the unpatched firmware.
"sudo" is bugged, vulnerability cve-2025-32462/3 - Page 1
Forum section: electronics / general

author: DiTBho
author_rank: Super Contributor
timestamp: July 14, 2025, 10:35:17 pm
content: There is a script around to exploit "sudo" and "chroot" to get "root" privileges.Readhere.Patches are ready, so patch it!

author: golden_labels
author_rank: Super Contributor
timestamp: July 15, 2025, 10:53:02 am
content: Discussed here

author: DiTBho
author_rank: Super Contributor
timestamp: July 15, 2025, 12:59:47 pm
content: Oops, I didn't find it using the forum search.Sorry, for the duplicate.

author: golden_labels
author_rank: Super Contributor
timestamp: July 15, 2025, 05:13:18 pm
content: My fault actually. I should have (I really should!) include the CVE numbers. :/
GigaByte: multipe UEFI vulnerabilities again - Page 1
Forum section: electronics / general

author: madires
author_rank: Super Contributor
timestamp: July 14, 2025, 10:54:20 am
content: CERT:- SMM callout vulnerabilities identified in Gigabyte UEFI firmware modules -https://kb.cert.org/vuls/id/746790Security researchers:- Multiple SMM memory corruption vulnerabilities in SMM module on Gigabyte device (SMRAM write) -https://www.binarly.io/advisories/brly-dva-2025-008- SMM memory corruption vulnerability in SMM module on Gigabyte device (SMRAM write) -https://www.binarly.io/advisories/brly-2025-009- Multiple SMM memory corruption vulnerabilities in SMM module on Gigabyte device (SMRAM write) -https://www.binarly.io/advisories/brly-dva-2025-010- Multiple SMM memory corruption vulnerabilities in SMM module on Gigabyte device (SMRAM write) -https://www.binarly.io/advisories/brly-dva-2025-01180+ mainboards are affected. GigaByte already published some updated UEFI firmwares.
AMD: TPM Attestation Failure - old but still a problem - Page 1
Forum section: electronics / general

author: madires
author_rank: Super Contributor
timestamp: July 09, 2025, 12:34:25 pm
content: This one isn't new and is already fixed since 2022. The problem is that some mainboard manufacturers don't provide updated firmware versions and users are still struggeling with BitLocker and other software.TPM Attestation Failure on AMD Platforms with ASP fTPM -https://www.amd.com/en/resources/support-articles/faqs/pa-420.html