Questions tagged [lan]

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8 votes
3 answers
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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 ...
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  • 81
0 votes
0 answers
52 views

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 ...
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  • 15
0 votes
1 answer
236 views

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)...
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  • 527
1 vote
1 answer
65 views

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

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 ...
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  • 123
0 votes
1 answer
55 views

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 ...
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  • 65
0 votes
2 answers
76 views

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 ...
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  • 101
1 vote
0 answers
43 views

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 ...
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1 vote
0 answers
415 views

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 ...
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  • 209
0 votes
2 answers
139 views

RS232 to ethernet over LAN

Can I connect an rs232 Ethernet converter to a switch and expect to receive a data on a php server listening to the of IP conversor? In windows I need to install drivers to create a virtual com, so I ...
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  • 101
0 votes
1 answer
274 views

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 ...
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  • 541