Questions tagged [rj45]

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1answer
54 views

How to connect Ethernet Magnetic/RJ45

I am connecting up my PHY to an RJ45 with magnetics and was wondering what I do with some pins on it. Here is the circuit for the Rj45 w/ magnetics. My questions are: do I connect pin 10 to the ...
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5answers
87 views

Can I convert my dozens of laptop adapters into universal ones by using RJ-11 or RJ-45 connections?

I have accumulated dozens of laptop (and other) power bricks over the years. Some of them belong to a corresponding laptop or device, others just haven't been thrown away yet. I'm trying to make them ...
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1answer
66 views

protect RS485 from PoE

I have a board with two RJ45 connectors. One is used for an Ethernet port and the other one is for a RS485. The Ethernet is for Power over Ethernet. What are some suggestions to protect the RS485 port ...
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1answer
61 views

Difference between the two Ethernet magnetic topologies

Background Hello, I'm building up a PCB for a PoE module based on Microchip LAN8720 IC. The recommended schematic is shown in the following figure. I built up a prototype based on the Waveshare ...
2
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1answer
94 views

Center Tap (CT) pins in RJ-45 Connector

I'm not an Ethernet connector expert. I was wondering what are the CT pins in RJ-45 connector are used for. From a search in https://www.edaboard.com/ I found this interesting answer from a user ...
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1answer
41 views

How to connect interfaces' shields?

I am designing a new PCB board these days, and I am confused about how to connect interfaces' shields. The interfaces on the board include USB, RJ45 and D-SUB, should them be connected directly to ...
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0answers
54 views

Transmitting I2S over 6ft

I've been looking at audio ADCs with most rated at 192Ksps with 24 bit audio. Typically the output is in I2S, but I understand that the signal is not intended to go far. I understand that HDMI can ...
0
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1answer
46 views

Manually Use LEDs on RJ45 Connector [closed]

I am using RJ45 connectors(2-406549-1) with built in LEDs, to transmit SPI lines for a microcontroller project(I needed CAT 6 cables for twisted data/ground pairs). I'd like to use those built in LEDs ...
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0answers
30 views

DMX over RJ45 daisychain extra pins?

Im building a DMX controller that uses RJ45. (Controller as in lights are connected to it) I will obviously have 2 RJ45 jacks for daisy-chaining. What I was wondering is, I've seen that multiple ...
1
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1answer
65 views

10Gb link data transfer between FPGA && PC [closed]

I'm trying to transfer data from 10Gb ETH subsystem of FPGA to 10GB ETH card of PC. SFP, RJ45 and ETH cable comprise of this data transfer pipeline. The RTL code is ready for testing and I'm looking ...
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0answers
35 views

Can I use 2 RJ45 magjacks (PCB mounted) used for pass through..on my PCB?

I need to put a pass through ethernet on my PCB. (rj45 to rj45). My circuit is similar to this guy.. I want to use my existing components. I have space on my chipplacer(yes I have a chipplacer line) ...
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1answer
80 views

How to fix a RJ45 connector patina without poison or with common tool?

The RJ45 connector from the wall of my house is rusted. The copper pins are covered by thick patina. The patina is so thick that it looks black. It definitely reduces communication quality so I would ...
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0answers
59 views

Magnetic RJ45 question. PCB to PHY 8 pins vs 12 pins

So I am working on a design where we are replacing a RJ45 PulseJack J0011 connector that has the magnetic transformers built in with a RJ45/USB combo jack(with magnetic transformers). I found an ...
1
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1answer
77 views

2 Ethernet jacks on a Device with ENC28J60 chip in with switch

Have a ethernet device that works with Microchips ENC28J60 chip perfectly. So if I want to connect a cable from a switch/controller, to device 1 (that has 2 RJ45 jacks), then have device 1 second port ...
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0answers
43 views

How to properly read current of a PoE Mode A device?

I'm trying to measure the power consumption of a PoE device using Mode A. I assume I would need 2x current readings - one for pin 1 (I1), one for pin 2 (I2), and then 1 voltage reading of from either ...
2
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1answer
294 views

W5500 with POE functionality Link status ON with nothing plugged in?

I am working on a design that uses a W5500 for networking. I followed a reference schematic and believe all my connections are correct, however I am facing issues with the network connectivity. ...
3
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2answers
861 views

PCB design for RJ45 jack

I'm designing a PCB to host an Applanix APX15 GPS/inertial navigation device. The hardware integration manual (which seems not to be publicly available) shows that a 10/100 BaseT Ethernet is supported ...
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0answers
38 views

ENC28J60 Circuit Connected With 2 Magjack in Parallel

I'm using ethernet controller chip ENC28J60 and I need to have it connected to 2 magjack in parallel, but I'm unsure if I made a correct circuit, is this can work? Please advise me, thank you very ...
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0answers
18 views

Difference between ARJC01-111002T and ARJC01-111002AR RJ45 connectors

I'm looking at two RJ45 connectors both by Abracon. The ARJC01-111002T and ARJC01-111002AR. They are both 10/100 Base-Tx Tap Up with LED included. The difference lies in the Magnetics schematic: The ...
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0answers
76 views

Ethernet in MIL-DTL-38999 connector

I am hoping to use a MIL-DTL-38999 circular connector for 10/100 Mb ethernet in acc. to IEEE802.3. So the insulation voltage should be at least 1500VAC for 1 min. Most connectors I have seen during my ...
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2answers
114 views

How to dial a phone number via DTMF tones?

I want to dial a phone number on a landline with DTMF tones generated by my phone. I tried soldering a 3.5mm audio jack to a phone cable and using my regular phone app, but nothing happened. In this ...
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0answers
42 views

Designing an Ethernet / RJ 45 disconnector

I am currently in need of a device that is plugged in between a host and a client to cut the connection regularly on a hardware level. This should simulate unplugging the Ethernet cable and plugging ...
1
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0answers
53 views

Small connector alternative for 10/100base Ethernet [duplicate]

I have been looking for a small connector that I can use for Ethernet 10/100 base communication. There were some similar discussions here about the same topic, but I couldn't find a solid answer. In ...
0
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1answer
53 views

CAT6: Assembling cable: RJ45 connectors

What do I need to check for when assembling RJ45 cables. I had some left over CAT6 cable from when I wired my home, and I bought some CAT6 RJ45 connectors from a local store: I cannot even push the ...
0
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1answer
20 views

Touching MOSI on RJ45 connector cleans bus noise

I am using a STM32F767ZI-Nucleo development board from ST. i'm using it to communicate by SPI with a UM7 orientation sensor board. There a register to read in the FW version. Normally I only receive ...
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1answer
63 views

DP83848C: DP83848 stops working after few month on field

In a product we designed, the LAN drive circuit(MII mode) is composed of LPC1768 and DP83848CVV. The function is very normal. There are no problems with factory testing. After using it in the hands of ...
1
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1answer
54 views

In sale or custom made?

RJ45 to 8 pos board connector. Board connector width: 12,4 mm Pin pitch: 2 mm Found inside a plastic card printer. Somewhere to purchase cable? Identification of the board connector?
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0answers
99 views

Is there a RJ45 with magnetics for PHY less network switch

I have a network switch indoor and camera outdoor. I plan on having a PCB with RJ45 with magnetics. Can any tell me how to choose an RJ45 with transformer for a PHY Less network switch.
2
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1answer
260 views

Ethernet with transformer

I have a schematic of Ethernet Transformer that supports POE, and 2.5GBT. I plan on using Ethernet with transformer on my PCB to connect to Network Switch. Are pin VC12 13, VC36 14, VC45 15, VC78 16 ...
2
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3answers
850 views

How critical is the magnetics circuit diagram in a magjack RJ45?

I'm looking at an example circuit diagram from ST, and it use sa 48F-01GYDXNL part that I can't find anywhere. It's a gigabit ethernet jack with magnetics, and the datasheet shows a circuit looking ...
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3answers
329 views

0-10V on RJ45 jack - bad practice?

I'm developing a control unit for ventilation systems. Beside switching those fans with a relay they are often controlled with a 0-10V analog signal. Now I found a product that uses a RJ45-plug to ...
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4answers
459 views

Can you replace a RJ45 connector with smaller connector?

I'm designing a small board that needs an ethernet connection. However, the RJ45 jack takes considerable space. I would like to reduce the footprint of the connector to safe some space. Would it be ...
2
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3answers
257 views

Power small microcontroller from motherboard RJ45 ethernet port

I'm wondering if it's possible to power a microcontroller (e.g. ATmega328) from a Ethernet RJ45 motherboard port. Unlike USB, there is no power line, all pins/lines seem to be data only. I am ...
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4answers
478 views

What can happen if 24vdc is applied to an Ethernet port?

We have a device with two RJ45 ports. One of these ports is for receiving 24vdc on pins 7(-) and 8(+) to power the device. The other RJ45 port is an Ethernet connection. The ports are of course ...
0
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1answer
752 views

Is it possible to use the same RJ-45 connector?

Given that the wires are connected to the pins and crimped with a crimp tool; is it possible to "un-crimp" the wires such that they can be unattached from the RJ-45 connector? Whereafter the connector ...
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2answers
371 views

Can I run DC voltage through RJ45 Connector with Magnetics?

I am designing a PoE (Power over Ethernet) application. My question is can I run 48V DC Voltage through a standard RJ45 Jack WITH Magnetics? or do I need one WITHOUT magnetics? I am planning to use ...
0
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3answers
735 views

How to route Ethernet PCB ? [closed]

I am new to PCB routing. In one of my projects, I need to be able to exchange data between nano-computers (https://www.variscite.com/wp-content/uploads/2018/01/DART-6UL_DART-6UL-5G_Datasheet.pdf) ...
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3answers
1k views

Divide RS-485 Simply without switch

I have an RS-485 input / output from a solar charge controller (SCC) and would like to read the output in two locations, while maintaining its input from one, or hopefully both of those locations (see ...
3
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2answers
2k views

DHT22 bad readings on long rj45 cable

Duplicate of https://raspberrypi.stackexchange.com/questions/91781/dht22-bad-readings-on-long-cable, I figured there is chances people here have a solution for me. Hi, I'm preparing a setup with a ...
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1answer
313 views

USB over RJ45 to USB C [closed]

I am working on an Arcade Stick/Fight Stick enclosure. Internally, the PCB (Brook UFB) runs USB over a standard Ethernet cable, to a Neutrik RJ45 passthrough. I typically then create an RJ45 to USB A ...
2
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1answer
398 views

Daisy chaining I2C modules using CAT5 and P82B715

I'm planning to connect several modules over I2C with distances between modules ranging 30-180 cm. I understand that in order to avoid the degradation of the signal due to the capacity of the ...
2
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1answer
697 views

MagJack for PoE Powered Device

I am adding Power over Ethernet functionality in my Toradex's System-on-module (Colibri iMX6ULL) based carrier-board design. I ...
3
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3answers
904 views

Flooded LAN RJ-45 connector may damage connected router? [closed]

I had an accident in the house and one of the LAN (cat. 6) cables including RJ-45 connector has been flooded. This "flooded" cable, along with other (dry) ones, was connected into a working gigabit ...
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0answers
460 views

Alternatives to RJ45 ethernet connections?

I have a system where two boards need to communicate through a serial bus with several lines --- rates are in the order of up to 3MHz. The boards will be several meters away (say, 3 to 5 meters / 10 ...
0
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1answer
231 views

Ident of a 10 contact RJ45 style connector with 8 + 2 contacts

I'm trying to find a plug that will fit into this RJ45 style socket. The top picture shows 8 contacts just as you would expect from a RJ45 8P8C style socket, in fact you can plug a standard ethernet ...
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4answers
5k views

What is the purpose of two cylindrical holders in RJ45 female connector for PCB

I am a beginner in PCB design. While using sensors for my project I thought it would be a great idea to connect my sensors using RJ-45 connector and in my device, I'm thinking of using a RJ-45 female ...
0
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2answers
342 views

How does things work between MODEM and PC on the RJ45 ethernet cable? [closed]

I am a newbie in electronic and i would like to ask why there is Transmitter and Receiver in the RJ45 cable connecting the MODEM and Computer? Which one goes first From Modem --> Receiver Receive ...
1
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1answer
519 views

Using Ethernet Cable in Electronics Projects

I'm building a cue light system (think traffic lights for theatre, media and entertainment industries) and I need to connect outstations (the traffic lights) to the control station (Arduino). Each ...
1
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0answers
68 views

Connecting WIFI Module to RJ45 pins output of device

Extreme noob questions here. I have a Lantronix XPico 240 wifi module that I need to connect to the rj45 output pins of a device the device pins are clearly marked but I am not sure about which pins ...
1
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2answers
1k views

Solder Ethernet directly to board? [duplicate]

I'm building a system based on one of the old Raspberry Pi model B's (yes, first series) into a very small enclosure. I need to run an Ethernet cable from the POE splitter I have in this enclosure to ...