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Why didn't 10GBASE-T Ethernet replace 1000BASE-T? [closed]

1000BASE-T (gigabit Ethernet over copper twisted pair) seems to have largely replaced 100BASE-T (100-megabit Ethernet over the same medium) in new equipment. However, 10GBASE-T (10-gigabit Ethernet ...
Shivaram Lingamneni's user avatar
0 votes
1 answer
81 views

Magjack to TPS2378 connection

I'm designing a PoE shield for an ESP32, but am having some trouble figuring out the CT connections for the TPS2378. In their schematic, they have some rectifiers connected to the CT pin of each ...
Maciej Swic's user avatar
1 vote
2 answers
105 views

Can you transmit a number stored on a digital counter over a network protocol without a micro-controller? [closed]

TL;DR I am storing a 24-bit number that represents number of pulses from a clock on a digital counter IC, and want to transmit that number to a more sophisticated device to perform a speed = distance/...
cornelius's user avatar
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0 votes
5 answers
332 views

Do I need to keep twisted pair ethernet wires consistent down the entire cable?

I have an ethernet cable that is hooked up to a 20 foot long 24 AWG twisted pair cable. The twisted pairs are not twisted to the same wires like in the ethernet cable. Would this be a problem? I ...
buckithed's user avatar
  • 105
1 vote
1 answer
208 views

How is digital data sent over long wires?

I want to have a mental-model for how digital data is sent over wires for basic networking purposes. My current understanding is that on the transmitting side and receiving side, there are ...
shafe's user avatar
  • 363
0 votes
1 answer
156 views

WiFi point-to-point in coastal environment - 2.4 vs 5 GHz [closed]

I am planning to provide Internet to a sea floating platform through point-to-point antennas from the coast. The distance is approximately 300 meters and the platform is quite shaky due to the weather....
p_a321's user avatar
  • 113
1 vote
0 answers
263 views

SFP proper address to read length

According to SFF-8472, there are 6 addresses (14 to 19) in table A0 for link length. And when I read a couple of SFP modules trough I2C, I see that more than one of these addresses contain value other ...
August's user avatar
  • 11
3 votes
3 answers
5k views

SFP, accessing EEPROM?

I have a SFP compatible module which has an I2C interface. I understand that SFP is a pseudo-standard but I can't find any documentation on the I2C interface and what registers in the EEPROM do what. ...
CakeMaster's user avatar
1 vote
0 answers
48 views

Connect 100Mbit GMAC to a 1Gbit GMAC VSC8211

I would like to connect a 100Mbit GMAC on the SAMe70 with a 1000BASE-SX Switch. What will happen if I connect VSC8211 to this device and then attach a 1000BASE-SX Switch? Will the Autoneg on the ...
Aard's user avatar
  • 67
0 votes
0 answers
88 views

Demodulation and RFID Readers

I was wondering if anyone had an inclination of demodulation and packets regarding RFID chips, sensors, and tags. When working with RF signals, and using a reader the device is capable of collecting ...
user avatar
14 votes
5 answers
10k views

How am I getting 1 Gbps through a CAT3 cable?

My work from home office, in a difficult-to-plumb part of my house, has an existing CAT3 running to it from the main part of the house. I wanted to use a wired connection because the Wifi flakes out ...
user1717828's user avatar
3 votes
1 answer
1k views

Capacitive coupling Ethernet on backplane [closed]

Sorry in advance I am fairly new to the electronics world and Ethernet signaling. I am a physics postgrad student doing some hardware work rather than an electronics engineering background. I have to ...
sbash's user avatar
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0 votes
1 answer
1k views

What are the Pros and Cons Using a Relay to Bypass LAN with Dual Ethernet Ports after POWER LOSS

EDIT: The Microchip Ethernet controller only supports 10/100 Mbs I have verified on my bench that two Magjacks with magnetics built in, and hard wired together, works on the bench using just the ...
blackedpi's user avatar
0 votes
1 answer
253 views

Why does my ethernet on my custom board only work sometimes?

I have a custom designed board that basically functions as an ethernet switch. On it I have 4 ports 3 with magnetics and 1 without magnetics. I could not use integrated magnetics on all of them ...
jtrug's user avatar
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2 votes
1 answer
404 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 ...
fullyjosh's user avatar
1 vote
1 answer
826 views

W5500 network configuration issues

I have used W5500 hardware for my gateway device. It has been implemented in 80-100 locations. But in 4-5 locations I'm getting an unusual issue related to the network connection. The ethernet mode is ...
Sourav Garnaik's user avatar
0 votes
1 answer
74 views

A few questions on modem/AT commands

A couple of questions about modem: I have been reading up on AT commands, and I see they're used to control the modem. They are sent over a serial connection so does that mean they are sent over UART?...
xyf's user avatar
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0 votes
2 answers
171 views

Power switch in electronics in Europe

Are there any requirements towards user electronics working in Europe stating that they need to have on/off switches? I am asking especially regarding networked devices. I have seen a lot of unmanaged ...
Łukasz Przeniosło's user avatar
1 vote
1 answer
223 views

What are examples of complex communication protocols that do not need a 7 layer OSI model to describe them? [closed]

I am trying to dissect an existing design of a custom communication protocol that uses infrared pulses to communicate between only two devices. The design has dozens of small RTL modules, but there is ...
gyuunyuu's user avatar
  • 2,101
0 votes
1 answer
68 views

Electric vehicle instrumentation [closed]

I have converted a vw bus to 112 VDC electric drive (Tesla battery modules 22.5VDC X 5 ea). There is also a 12V system for lights and instruments. The BMS supports SPI and CAN. I have no experience ...
PatM's user avatar
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0 votes
2 answers
3k views

How does ISP cut the customer's internet access technically?

We know that if we fail to pay our internet bill then our internet access will be cut. But how does the ISP technically cut the access? For wired internet, do they just shut down the port where the ...
Noob_Guy's user avatar
  • 443
0 votes
4 answers
219 views

Is building a long range wifi antenna to connect to the up and coming starlink internet possible? [closed]

I want to try to convert a residential satellite dish into a long range wifi antenna to theoretically see if I can connect to the up & coming starlink internet that is being released in Canada and ...
LeftHandyAndy's user avatar
1 vote
4 answers
3k views

CAN Bus Dominant and Recessive?

Why does CAN Bus represents signals with an inverted logic, high voltage for a logic 0 and low voltage for a logic 1? Is there any advantage in doing so?
Manzillo's user avatar
0 votes
1 answer
119 views

Use 2 of the 8 cables of an existing ethernet connection

There is an Ethernet cable that runs from a server room to an office. That cable is connected to a router. There are times when ...
Tono Nam's user avatar
  • 557
0 votes
2 answers
105 views

If you only have an Ethernet MAC without higher layer, what happens if packet is lost?

Does an Ethernet MAC have a built in ack/retransmit scheme or is this the job of a higher layer of network protocol? In other words, if you have only the Mac layer and an Ethernet packet is lost ... ...
pico's user avatar
  • 183
0 votes
1 answer
69 views

MAC data width for 100/40 Gigabit Ethernet system on Xilinx Ultrascale core

If I remember correctly, Xilinx's 10 Gigabit Ethernet Mac core has 32 bits data bus connected at the mac side at 156 Mhz.... What about the 100 Gigabit and 40 Gigabit Ethernet Subsystem in the ...
pico's user avatar
  • 183
1 vote
1 answer
35 views

What hardware limitations limit the number of stations connected to and access point chip?

I am designing a Linux based embedded access point that needs to support as many connected stations as possible. I understand the first limiting factors like CPU, RAM, and available bandwidth. ...
Funkyeah's user avatar
  • 301
0 votes
1 answer
66 views

Are there any disturbances caused by wire of socket which not being used?

Let's say there external wiring that lead to AC power socket. Are there any electromagnetic field or something from the wire if the socket isn't used at the moment (nothing plugged in). What if ...
R S's user avatar
  • 105
3 votes
1 answer
64 views

Proportional fair scheduling

I came across this section in the paper Providing quality of service over a shared wireless link, IEEE Communications Magazine: Consider a very simple system with two users. The service rate (in a ...
ee_user's user avatar
  • 65
1 vote
1 answer
474 views

Does 10GBASE-R fully replace 10GBASE-X?

10GBASE-R using 64b/66b encoding scheme (3% overhead) 10GBASE-X using 8b/10b encoding scheme (20% overhead) 10GBASE-R is achieved with single xcvr lane 10GBASE-X is achieved with 4 XAUI xcvr lanes &...
Learner's user avatar
  • 185
0 votes
1 answer
170 views

RJ-45 with only four wires?

Dig through a junk drawer, I find a long cable with RJ-45 on each end.  Definitely not RJ-11.  It has only four wires.  What might it have been used for? I'm not expert on wired ethernet, but in ...
WGroleau's user avatar
  • 123
1 vote
1 answer
200 views

How to avoid duplicate messages in a mesh network of mcus

I'm working on a project, where each pcb has a connector on every side, so you can connect these board in a grid. It's basically a mesh network of modules. These modules need to communicate with each ...
Máté Magyar's user avatar
-1 votes
1 answer
105 views

Bit-Map vs ALOHA protocol

So i have been reading about ALOHA and Bit-Map protocols and i am note sure which is more preferable in the following scenario: 8 stations, numbered 0-7 want to transmit in any given time slot. ...
Networking's user avatar
0 votes
1 answer
213 views

Finding the overhead and distance of an unknown code based on message making algorithm

for an information word M with m bits that is coded as following: M is coded into a word A using an unknown code that allows detection of not more than one error. the code word is the word obtained ...
hps13's user avatar
  • 3
0 votes
1 answer
206 views

THINNET 10BASE2 Network using RG-58 Coaxial Cable operating frequecy?

I am trying to figure out what the signal frequency of a 10BASE2 network is. Specifically the frequency of the signal being carried over coaxial cable. Data transfer is 10Mbps and the network adapters ...
Hooplator15's user avatar
0 votes
1 answer
67 views

Connecting nodemcu through internet

I have a NodeMCU and a website (free website domain provided by hpage.com) and I have to send and receive some data (suppose a 8-bit number) from the website to the NodeMCU via internet. The NodeMCU ...
Shounak's user avatar
0 votes
0 answers
451 views

Why does 100G Ethernet use FEC while Infiniband doesn't?

The 100G Ethernet physical layer signalling is moving to PAM4 and using Forward Error Correction (FEC) when the lane signalling rate is greater than 25 Gigabaud (Either 4 lanes x 25 or 2 x 50). ...
dave's user avatar
  • 152
0 votes
0 answers
79 views

Do Broadcom's Ethernet chipsets need special software to operate?

I want to implement an Ethernet switch using Broadcom's chips. Are singing an NDA and getting the datasheets enough to work with the chips? I have heard that the chips must be programmed by a special ...
M.H's user avatar
  • 51
4 votes
2 answers
937 views

Why are length-prefixed fields considered hardware unfriendly?

One criticism of GENEVE (a network encapsulation protocol) is that it uses tag-length-value fields, and these are hard to process in hardware. Why is this considered hardware-unfriendly? What ...
Demi's user avatar
  • 239
-1 votes
3 answers
281 views

Does the phone transmit waves? [closed]

In a cellular connection, How much is power density (in W/m2 or mW/cm2) of the RF energy from the phone to the tower? If not possible in above units then can I know in dbm ? My phone has: Head SAR: ...
ObsessionWithElectricity's user avatar
-1 votes
1 answer
63 views

Choosing a networking protocol [closed]

I need several mbeds to communicate with a host PC, which will issue commands to individual mbeds. What would be a suitable networking protocol to achieve this? Bear in mind, an internet connection is ...
M-R's user avatar
  • 789
0 votes
1 answer
52 views

Inter Device Expandable Network Protocol?

Currently I am working on a project where I need to install several peripheral devices in the network along with a master. This total system have some industrial application. I need to have the ...
Aaditya Dengle's user avatar
3 votes
1 answer
2k views

Generate hamming code-words with given minimum distance

My understanding of hamming code (adding this as it might help someone in future): Description: Hamming code is basically an extended parity check code. Message is divided into blocks, and multiple ...
Vivek Maran's user avatar
2 votes
1 answer
2k views

What is problem with NRZ and how manchester line coding handles out of sync tx and rx clocks.?

I am reading about physical layer of the OSI model. Specifically the different ways in which digital bits can be represented as voltage levels, among the multiple types are: NRZ. Manchester encoding. ...
Vivek Maran's user avatar
-2 votes
1 answer
524 views

What can i use an oscilloscope for in terms of networking [closed]

as someone who is just getting their feet wet in networking (going for a+ cert currently and would like to go further,) ive noticed that oscilloscopes can be used to monitor... seemingly any ...
Sam.b's user avatar
  • 1
0 votes
1 answer
255 views

Raspberry connected to adhoc and wifi simultaneously [closed]

Currently I am working on a project where we have to connect multiple cameras to a Raspberry. Our idea is to buy multiple Raspberry PIs with a connected camera. These raspberries connect to a ...
Soundwave's user avatar
  • 101
0 votes
1 answer
86 views

How to implement Ad Hoc on Radio Frequency node? [closed]

i want to implement RF based network as indicated in below figure Node is Basically Radio Frequency Transceiver i.e Si4432 interfaced with C8051 Micro controller . These nodes are simply Act as a ...
Sanjay kale's user avatar
1 vote
0 answers
116 views

XBee S2C DigiMesh Networking

I recently bought a Digi XBee S2C Development Kit. This is my first time with XBee radios and I'm working with DigiMesh as I will be using sleeping coordinators to make the entire network sleep. I ...
Andres's user avatar
  • 1,864
1 vote
1 answer
853 views

Can we do source transformation for dependent sources? [closed]

In network analysis, during source transformation for dependent sources
Pramod_achar's user avatar
0 votes
2 answers
1k views

How does data travel correctly over the wire?

I understand that through varying voltage, data can be transmitted as "high" and "low". What I don't wrap my head around is how the receiving end "dissect" the frame. I know there is a concept of ...
Zanko's user avatar
  • 109