Questions tagged [network]

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27
votes
8answers
9k views

Why not implement 1Gbps, when all I need is 20Mbps?

Background I am working with a client on a large project which requires a custom networking chip to be designed to solve the data transfer requirements within the project. The network is intended to ...
15
votes
3answers
2k views

What is the underlying mechanism behind Wi-Fi getting slower with greater distance?

It's common knowledge that the further you go from a Wi-Fi network point, the slower the network over Wi-Fi gets. But why would this be the case? Radio signals propagate at essentially the speed of ...
11
votes
1answer
3k views

AT Commands to transmit data through TCP/IP stack with LTE network

I need to design an embedded sotfware that will drive a LTE cellular device (like u-Blox TOBY L2 Series) and its TCP/IP stack to transmit some data toward a distant server. I'm waiting for the device ...
10
votes
4answers
5k views

Can you send data usefully over one wire, literally one wire?

It is possible to design networking systems that only use two wires: one for data and one for a common ground. Examples include 1-wire and Pin&Play. These are called single wire systems because ...
9
votes
2answers
2k views

why is there dark fiber? [closed]

Dark fiber (unused fiberoptic cables) is a confusing term for me. Why would any company build so much excess capacity? Such a business decision seems unwise. There are even companies that brand ...
7
votes
3answers
31k views

What is the exact difference between SGMII and 1000Base-X?

I was wondering what the exact difference between SGMII and 1000Base-X is, because both seem very similar. Is the "big" difference only the physical medium they are supposed to be transmitted on? Both ...
6
votes
2answers
3k views

Networking options for multi-node Star topology

I want to create simple network consisting of 1 master and up to 16 slave nodes. Project will be based on PIC MCUs. Network has the following specs/requirements: Relatively low speed Inexpensive ...
6
votes
2answers
140 views

Detect if a CAN node is transmitting or receiving

I am not an electrical engineer or EE student; I'm a diagnostic technician. AFAIK, a CAN transceiver receives bits by measuring voltage between the network and its ground/low reference (high ...
6
votes
1answer
2k views

Beacons versus Sensor Nodes

What is the difference between a beacon node and a wireless sensor node? In addition to positioning information, beacons can provide temperature measurements. In that case what would be the difference ...
6
votes
1answer
2k views

What is bandwidth?

I'm having hard time understand what bandwidth really is? The book i'm using defines it as the width of a signal's spectrum (where spectrum is the range of frequencies in a signal). So, for example, ...
5
votes
3answers
2k views

How to build a large WIFI system inside a factory which supports thousands of devices? [closed]

I am a newbie at network and I am trying to find an architecture for a WI-FI system which is deployed in large area(over 50,000 square meters) and connects 1000-2000 devices with a server. Each of ...
5
votes
4answers
1k views

Rc network placing R before C vs after

simulate this circuit – Schematic created using CircuitLab Using a rc network to smooth a PWM signal from a microcontroller, to a true analogue voltage. What will be the effect of having the ...
5
votes
3answers
273 views

What determines the frequency of network cable

You have Cat6, 23 AWG, rated for 250Mhz frequency. You then have Cat6a, 23 AWG, rated for 500Mhz. Both are unshielded. How is Cat6a able to transmit data at a higher frequency then its counter part? ...
5
votes
2answers
1k views

Faulty RS-485 device has irregular effect on neighboring devices in bus setup

I am trying to understand the mystery of how one faulty RS-485 transceiver, in a network bus with several devices, seems to have very irregular influence on its own and its neighbors transmission ...
4
votes
1answer
4k views

Long distance Arduino sensor network - 1Wire protocol or RS422?

I have some sensors from each of which I need to - read a voltage - be able to switch them on. (They are powered by AC 220V power supply). Distance to be covered is some 40 meters. I don't want to ...
4
votes
1answer
60k views

Calculating the power supplied by the current and voltage sources

simulate this circuit – Schematic created using CircuitLab I have attended one exam where I was asked to solve this Question. Generally the Power is nothing but the product of current and ...
4
votes
2answers
1k views

Does the voltage increase on 10Base2 and 10Base5 ethernet when the signal is reflected? Will this trigger the collision detection?

From what I understand, the collision detection will become true when the voltage on 10base2 or 10base5 coax is abnormal. Quote from Wikipedia: If termination is missing, or if there is a break in ...
4
votes
1answer
4k views

Input and Output Impedance parameters of two port network

I am reading about two port network and I come to about Z-parametrs $$\begin{bmatrix} \mathbf{V_1} \\ \mathbf{V_2} \end{bmatrix}=\begin{bmatrix} \mathbf{Z_{11}} & \mathbf{Z_{12}} \\ \mathbf{Z_{...
4
votes
1answer
372 views

Wireless telecom system (cellular with Erlang and spectral efficiency)

We have a spectrum of 20MHz that we will use on a wireless cellular system, which requires 50kHz per channel. The system is using cluster size K = 4 and the radius of every cell is R = 1 km. a) ...
4
votes
4answers
185 views

What is a cheap technology to allow multiple devices to know each other when close in proximity?

I want to make some objects that will know when they are, let's say, 3 feet(or less) from each other. They need to also know the identification of the objects close to them. For example. If object ...
3
votes
5answers
943 views

Is there a “common voltage reference point” for all the circuits that connect together?

Nowadays, the whole world is interconnected. We often say one device communicates with another device through the network. In this context, the 2 devices are viewed as 2 separate entities. But I think ...
3
votes
5answers
1k views

System response types

Whenever I am given a system type with a certain transfer function, I am always asked to proceed to find out the 1. impulse response and 2. step response of the system. My question is, what is so ...
3
votes
2answers
783 views

What are state space equations?

I'm in a Linear Circuits semester II class, and we're going over 2 port networks. State space equations show up on the practice exams but not the lecture slides or book. I was wondering if they were ...
3
votes
1answer
2k views

CAN Bus - Is bit stuffing required at EOF and INT?

In a CAN Bus, to ensure enough transitions to maintain synchronization, bit stuffing is used after five consecutive bits of the ...
3
votes
2answers
1k views

How do I structure a slow speed CAN Bus network with 400 nodes?

I'm looking into the possibility of building a CAN bus network with ~400 nodes in it. The total cabling distance is about 200m but it doesn't have to be fast; each node only needs to transmit a single ...
3
votes
2answers
1k views

Which wired communication standards operate at 2km range or above?

I am trying to find a standard (hopefully with a chip set) which can communicate over copper (twisted pair) for at least 2km, maybe up to 10km, using a baud rate somewhere between 10kbps and 100kbps. ...
3
votes
1answer
756 views

Finding out unknown voltage using mesh analysis

How to find out the voltage v3 in the following circuit using mesh analysis? I tried to solve it by considering the dependent current source as a super mesh and eliminated it. The equations I got ...
3
votes
1answer
71 views

How does an LC network enable a shoot through state for an inverter

I was researching about inverters when I came across the Z source inverter. The Z source inverter is unique in a sense that it enables a shoot-through or a short circuit condition by closing any two ...
3
votes
1answer
132 views

Multiple-terminal notification system to make calls between rooms

TL,DR: How to implement notification system with multiple terminal devices, which allows to make call from any terminal to any other terminal? Main constraints are not using programmable chips/MCUs (...
3
votes
1answer
1k views

Best solution for Mesh network? XBee?

I want to connect a whole lot of independent sensors (Arduino boards) to the Internet. They are all within 10m of each other. Should I use XBee's and link them in a mesh network and have one access ...
3
votes
1answer
1k views

Switching RJ45 with relays

So I am setting up an automated test environment for an electronic product and one of my needs is to simulate a user pulling the cable from the product. Since only 4 wires of the RJ45(T-568B) cable ...
3
votes
1answer
41 views

How many nrf24l01+ can be transfer data between themself in one pipe

My IOT project has ten or more nrf24l01+ modules which They're going to get orders from one nrf24l01+ module and then get back response to that one nrf24l01+. Can i do it in one pipe?
3
votes
0answers
76 views

Understanding Phone Service from Cable Companies [closed]

Since communication technology is considered part of EE, I thought I would pose this question here - hopefully it is on-topic. Cable companies like Comcast have been offering home phone service for ...
3
votes
1answer
141 views

How do coaster table pagers order themselves?

You've probably seen them. Those coaster or puck size electronic things they give you at a restaurant to buzz you when your food is ready. A seemingly common element of their design is that they have ...
2
votes
5answers
1k views

Is there a wireless protocol for 100m-1km range in rural property?

I am an electornics hobbyist. A friend of mine, who is building an organics farm, wants to wirelessly automate some devices in his property, and asked for ideas. His problem is to "talk" to remote ...
2
votes
5answers
6k views

Importance of keeping the electricity network frequency stable

The frequency in the electricity network is kept in balance by primary and secondary control among others (see e. g. here). I read that frequencies below 47.5 Hertz are dangerous and can lead to ...
2
votes
4answers
436 views

Does a poor mobile network signal cause faster battery drain? [closed]

Quite a simple question actually, does a poor mobile network signal cause faster battery drain? If so, is there a difference between 2g/3g/4g/5g in the speed at which the battery drains.
2
votes
3answers
199 views

Detecting button press over computer network

I would like to make a networked device (along the lines of hotel room service call) that has multiple input lines that may be uniquely identified on a computer on the network. I found a product with ...
2
votes
2answers
11k views

What's the difference between virtual circuit switching and circuit switching? [closed]

Circuit switching's packets take the same route as virtual circuit switching's do. So, how do I distinguish between virtual circuit switching and circuit switching?
2
votes
1answer
42 views

I2C differential network architecture using PCA9615

I'm building an architecture for a large scale robot (3x3meters) and I would like to build a specific architecture around I2C differential to control motors drivers (this should be noisy). My problem ...
2
votes
1answer
227 views

Low-pass filter step response graph doesn't make sense

Yesterday in the lab we were supposed to calculate the step response of a standart simple RC low-pass filter that looks exactly like the network above. However, when we try to plot the step function ...
2
votes
1answer
7k views

Frame size range calculation for stop-and-wait protocol

I have a question and answer below. The answer seems to show less working on how it derived. My question is if the efficiency of at least is changed to say 60%? Will it still be the same answer? ...
2
votes
4answers
272 views

What is the voltage across the circuit shown

This is the basic simple question. When I connect this circuit there is voltage seen in VM2. According to me, no current flows through R5, therefore there should be no voltage across the resistor, and ...
2
votes
2answers
1k views

ARP message to enc28j60

I have made the driver for enc28j60 for LPC1788 and I'm trying to send UDP message to LPC via wifi enabled device (iOS, windows over wifi). But transmission fails. Wifi device sends the ARP request. ...
2
votes
5answers
3k views

Why can a single sine wave signal be used to send digital data but a composite signal is needed to send human talk,etc.?

I can understand the following text (Data Communications and Networking: 4th Edition, Berhouz Forouzan, Ch.5, page 179) which says that a property of a single sine wave carrier signal (phase, ...
2
votes
1answer
1k views

Link integrity test pulse vs carrier signal

Ethernet uses a refinement of ALOHA, known as Carrier Sense Multiple Access (CSMA), which improves performance when there is a higher medium utilisation. When a NIC has data to transmit, the NIC first ...
2
votes
1answer
872 views

What's the difference between uIP, lwIP, 6LoWPAN?

I just started to work on a wireless sensor network project and encounter these three terms: uIP, lwIP, 6LoWPAN. Since I'm new to this area, could anyone please explain the differences between these ...
2
votes
1answer
1k views

Media converter (eth/fiber) problem in communication

I have a system which looks like that: CPU(macbook)<-->thunderbolt<-eth->ethernet media converter<-fiber->ethernet media converter<-eth->raspberry pi 2. Both CPU and RP2 have static IPs. ...
2
votes
2answers
798 views

What do i need to communicate my sensors with LoRaWAN, simply?

I'm new at wifi communications, i need to use Lora at my job project. I searched the internet to learn what the long range rf is. So, if i want to communicate with my sensors(on my mcu kits) over long ...
2
votes
2answers
880 views

Powering multiple devices from a single supply with 48V

First of all I asked this question in DIY.stackexchange.com, because of the cabling in the house. Here I would like to ask about the electronics (or electrical) part of it. And there is a very ...

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