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Questions tagged [networking]

The tag has no usage guidance.

0
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1answer
33 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 ...
0
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0answers
10 views

finding the minimal length of a broadcasting frame in a channel(CSMA/CD)

i am unsure about this question. would appreciate your assistance with it. in the following CSMA/CD network with cable length L and propagation T. assuming that the signal is not decreasing and there'...
-1
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1answer
53 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. ...
0
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1answer
57 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 ...
0
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1answer
36 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 ...
0
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1answer
38 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 ...
0
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0answers
58 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). ...
0
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0answers
42 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 ...
4
votes
2answers
828 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 ...
-1
votes
3answers
241 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: ...
-1
votes
1answer
60 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 ...
0
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1answer
37 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 ...
2
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1answer
612 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 ...
1
vote
1answer
486 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. ...
-2
votes
1answer
115 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 ...
0
votes
1answer
107 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 ...
0
votes
1answer
50 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 ...
1
vote
0answers
80 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 ...
1
vote
1answer
115 views

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

In network analysis, during source transformation for dependent sources
0
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2answers
336 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 ...
2
votes
1answer
84 views

Unshielded RJ45 connectors on SFTP Cat5e

I have "inherited" an old SFTP Cat5e cable connecting the basement of my house to the upper floor. There seems to be a break on some of the wires (6 and 7) so it won't even function at 100mbps. I ...
0
votes
1answer
58 views

Different phases on different components

Say I have a typical wiring in my room where in I have two computers (A and B). A is a ...
0
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0answers
227 views

BLE mesh power consumption

How can BLE mesh networking operate without drastically increasing latency or power consumption? Presuming a long single hop connection to the gateway. I cannot read the SIG document!
1
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0answers
73 views

Would forward error correction help?

I am working with a 433 Mhz transmitter for an arduino project. I found a Manchester encoding library on github(https://github.com/mchr3k/arduino-libs-manchester). It has checksums built in but the ...
0
votes
1answer
489 views

MCS 6 Transport Block size for 1 RB?

Edit: for some context I'm working on an LTE project and was wondering if anyone more knowledgeable than I would be able to answer this question. Given the first table, we can see the relationship ...
0
votes
1answer
776 views

What do pull-up and pull-down resistors do in an ethernet PHY?

I've noticed that most ethernet physical layers (i.e. the interface between the MAC/network and e.g. an RJ45 connector with magnetics) have pull-up or pull-down resistors on the TX and RX lines. For ...
0
votes
2answers
1k views

Where is ESP8266 TCP/IP stack defined?

I just installed Micropython on my ESP8266 and realized that TCP/IP works fine with it. This made me realize I don't know where it's defined - options that came to my head are: 1) in Micropython code, ...
1
vote
1answer
68 views

How can 100Base-T achieve 100 meter distance at 125Mhz clock?

I admit I have some large holes in my understanding of this topic, but it seems like you run into physical limitations of the speed of light. If the speed of electricity through copper is about 280,...
1
vote
1answer
91 views

very cheap bus communication network

Over Christmas I started thinking of putting together some nice lighting for the house. The main element I'm thinking of is a strip of LEDs that are individually addressable. The only ways I can think ...
0
votes
1answer
66 views

Device-to-device/machine-to-machine wifi IoT system — pushing message/action to a connected device

I am not sure if this is the best community for this question, but I couldn't find one dedicated to IoT. Or should I ask on StackOverflow? I am looking to build the following IoT system using WiFi ...
2
votes
1answer
992 views

GMII/RGMII TX_ER signal: guaranteed functionality?

I have a question seeking to clarify EXACTLY what happens during a GMII exchange between MAC and PHY. Specifically, regarding the TX_ER signal. IEEE 802.3 Section 3: TX_ER is driven by the ...
3
votes
1answer
126 views

What punch down tool should I use on this ethernet jack?

As you can tell this does not have the vertical lines like a regular keystone jack. So i was wondering what punch down tool should i use? ...also what are these called?
1
vote
0answers
471 views

Broadcast traffic issue in PLC Ethernet network

The setting: network with about 10 PCs and 8 AB RSLogix 5000 PLCs. The issue: Everything is communicating OK, but I'm seeing what appears to be a lot of broadcast traffic within the network. It is ...
0
votes
1answer
6k views

What is a flow table? Openflow

As question asks. What is a flow table? How is it different from forwarding table? This link says: Switching = forwarding by destination MAC Routing = forwarding by destination IP Forwarding = ...
2
votes
2answers
141 views

Ethernet surge and protection

I recently worked with a client who experienced a transient on their Ethernet cabling. As you can see, no actual PCs were damaged, only the Ethernet cards of some machines. We don't know where the ...
0
votes
1answer
911 views

Sending data over network via MicroController (Sparkfun Thing // ESP8266)

I'm getting frustrated and keep hitting a wall. My basic setup is I have an Apache server running on my Raspberry Pi and I am looking to send sensor data over the wireless network both are connected ...
0
votes
1answer
65 views

Operating multiple low power devices from 1 adapter [duplicate]

I have 3 WRT54G routers (12V), 1 voip gw (9V), 1 cable modem (9v) and a gbit ethernet switch (12v) which are all operating from their own adapters. I planning to build a low power (probably 12V UPS) ...
0
votes
1answer
527 views

How does Frequency-division multiplexing deals with overlaps?

As I understand it, FDM uses separate frequency for each channel, thus A will transmit data, for instance, every two seconds and B every three seconds. But, what will be delivered on the wire in the ...
0
votes
1answer
133 views

Mobile WIFI: how close can mobile devices be placed and still have a functional WIFI connection?

I wish to run a large array (50+) of hacked Android phones as a computing cluster. They will need to be networked so I plan to use their built-in WIFI radios to talk over a single WIFI network. (I ...
1
vote
2answers
86 views

How do car trackers communicate?

So i was thinking, How do car trackers or long distance (over 100kms) remote control communicate to their central commands,? Do they use the cell phone network? what could one require to set up such a ...
0
votes
1answer
1k views

Calculating attenuation of coax cable run

This question is related to my question about long-distance Ethernet. I discovered the Netsys NH-310C, a reasonably-priced device for converting Ethernet to coax for long-distance runs. The ...
0
votes
1answer
73 views

What kind of failures can be explained by this fix?

My Dell PowerConnect 2324 is normally plugged in 24/7. At some point it stopped working (no connectivity, power light out) and I disconnected it from the network and power. Recently I opened it up and ...
3
votes
1answer
218 views

Weather Balloon Wireless Mesh Networking

I am trying to get real-time data feed from a homemade weather balloon radiosonde with the objective of sending HD video during the flight; this could be relevant for GoPro-ers who want to send their ...
0
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2answers
40 views

How is the capacity of link more for single network link

In networks capacity_of_link = bandwidth*propagation_delay My doubt is how can a same wire carry multiple signals? Is is because the wire is very long (still the wire can be either high or low). I ...
4
votes
2answers
817 views

On-Board connection of ethernet transceivers

Is it possible to connect two 1000-BaseT transceivers with each other? I have two transceivers, each of them has 4 twisted pairs that actually are meant to be connected to an RJ45 connector including ...