Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [lan]

LAN stands for Local Area Network, a computer network that connects computers within a limited area, like an office or a school.

16 questions
8
votes
3 answers

Why is this 75 ohm resistor present in the Ethernet connector? (10/100Base-TX)

In this datasheet (and in other similar) pins J4, J5, J7, J8 are connected to the ground with a resistor and cap. For 10/100Base-TX pinout it seems they are not used (at least for modern of the standard. for old is stated as "bidirectional"..?). So…
exzb
  • 89
  • 4
1
vote
0 answers

LAN8742a autonegotiation gives a half-duplex mode result when it's espected to be full-duplex mode result

I was testing an ethernet based project PCB that uses LAN8742a xip (lan xip seller link) and a stm32f207zg microcontroller (mcu seller link). We are having some issues when we increase the stress level. So I was debugging the application (it's a…
Suvi_Eu
  • 777
  • 6
  • 19
1
vote
1 answer

How are LAN routers, WAN routers and eNodeBs connected to each other (TCP/IP)?

I'm new to telecommunication, and from what I understand, an user equipement is either connected to a LAN router or an eNodeB, and a LAN router is connected to a WAN router, and routers send the packets to the correct destination with a routing…
qwerty_99
  • 123
  • 4
1
vote
0 answers

lightning protection on LAN cables indirect strike crowbar VS isolation

i am using a crowbar lightning protection system we built 10 years back for LAN on our own devices for the mine industry. it works very well. at that time i decided to use TVS bidirectional 18v , GDS 90v. i added 2 diodes to increase the speed of…
boshofff
  • 11
  • 1
1
vote
0 answers

Interfacing LAN9512 or LAN9514 to KSZ8895 Ethernet Switch for Raspberry Pi Compute Module 3+

I would like to add Raspberry Pi Compute Module 3+ to my design. My design has an ethernet switch KSZ8895 on board. The 5th port can be configured for using MII. It is known that the Compute Module (CM) provides Ethernet and USB via an IC. It is…
Sener
  • 231
  • 5
  • 16
0
votes
0 answers

Broadcom BCM54194 PHY Magnetics

I am designing an application board using a third party Ethernet Switch module. I am unable to get the Switch module manufacturer support on the recommended magnetics to use. I can see that the Switch is using Broadcom BCM54194 as the Ethernet…
TCP7532
  • 1
  • 1
0
votes
1 answer

Could two LAN7800s be used to create a USB3-over-Ethernet extender?

I am looking to create a USB 3.0 extender and am considering the possibility of using two LAN7800 ICs to achieve this. My goal is to achieve speeds of up to 1Gbps. I already know that the PC will see a Network Adapter, but would it be possible to…
SimpleElecticalEngineer
  • 1
0
votes
0 answers

RJ45 Connector - Capacitors

I need an STM32F4 to communicate through LAN. An electronics technician provided a schematic (Version 1), of which I'm only showing the relevant part. I did my own research on the Internet and in the datasheets of both the transceiver and the…
Erwin Cornet
  • 1
0
votes
1 answer

Using ethernet PHY building blocks PAM/PCS

This is a more theoretical question. Is it possible to use internal building blocks of an Ethernet PHY directly and without typical Ethernet framing? I am looking for a way to have access to the internal PAM/PCS structures (twisted pair) to use it…
ARi
  • 1
0
votes
0 answers

Using an Ethernet Phy and XFMR instead of RS422

We've been using a quad RS485 setup for some time. No problems. Now we'd like to increase the speed over what we can get away with on RS485 with the micro we're using. Essentially, we've been implementing an SPI port using four RS485 parts. I've…
GaryLa
  • 15
  • 6
0
votes
1 answer

Troubleshooting I2C issues of ESP32-POE-ISO with LAN

i'm trying to read a I2C HTU21D from this breakout (schematics below) temperature and humidity sensor and send data to an mqtt broker. I'm using PCA9306 in order to use 5V and go "far" (30m) from the main MCU PCB using CAT5E cable and RJ45…
VirtApp
  • 569
  • 4
  • 23
0
votes
1 answer

Reading status of switches over LAN

I need to design a circuit that reads the status of 6 switches and makes the status available over LAN for a professional project. The design should be implemented in hardware (no microprocessor.) My initial idea was: Read the discrete status of…
Lunde
  • 75
  • 6
0
votes
2 answers

Is it possible to build a fake flash drive for the TV that is in reality a share drive?

Problem I hate having to copy what I want from my PC to a flash or external drive and then stick it in the smart TV (which already has the ability to browse files on a flash drive) every time. I want the smart TV to always have access to a shared…
BeemerGuy
  • 139
  • 4
0
votes
2 answers

RS232 to Ethernet over LAN

Can I connect an RS232 Ethernet converter to a switch and expect to receive data on a PHP server listening to the IP converter? In Windows I need to install drivers to create a virtual COM port, so I guess if I connect a converter directly to a…
asterix
  • 101
  • 10
0
votes
1 answer

Gen3 LAN Bypass

I am working on LAN Bypass circuit for 1000 Mb/s Ethernet ports. I need to use relays to turn the bypass mode or no link mode on during power failure. My doubt is whether the relays should be used between RJ45 & Magnetics i.e Line side or between…
Oshi
  • 591
  • 1
  • 6
  • 24
1
2