Questions tagged [network]
The network tag has no usage guidance.
204
questions
0
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1answer
86 views
Stability of passive networks
Generally we see that single Port electrical networks (LTI system) that contains resistors and other passive elements are stable .
So is it safe to assume that
passivity(absorbs power) of electrical ...
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 ...
0
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1answer
22 views
Parameters of two port networks
Is parameters(Z parameter, Y parameter etc.) of two port networks are constants? I try to figure out this and found that if network contain some active elements or independent source then these ...
0
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1answer
55 views
Finding S parameters from Z parameters
How do I find S parameters from Z parameters, for a two port network.
I am sorry to ask such an elementary question but I am not from an engineering background. I have tried to search answers online ...
1
vote
2answers
39 views
Test to identify active source in electrical network
I have a black box of a N-port electrical network and I wanted to know whether inside this box is there any active source of energy (i.e battery) present or not, so is it possible to determine active ...
0
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1answer
22 views
Linear electrical network
Is zero input zero output test of an electrical network is necessary and sufficient condition for network to be linear i.e for example if I have electrical network of N-port and I measure current and ...
1
vote
1answer
139 views
Create a synchronous network of 400 devices
I have around 400 devices that i want to address in a star topology. Each device controls a set of LED strips (27*12 resolution). The idea is display a video animation in a good frame per second rate (...
0
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0answers
14 views
Determine the Y parameters of two port network. help me check what is wrong with my answer on this question
Determine the Y parameters of two port network
0
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1answer
37 views
Determine the z parameters of two port network
New to EE, and I was wondering if anyone could help me check what is wrong with my answer on this question.
$$\frac{V1-Vn}{4}+\frac{V2-Vn}{3}=\frac{Vn-4V1}{2}$$
$$Vn=\frac{-27}{13}V1-\frac{4}{13}V2 -...
0
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0answers
20 views
Elastic optical network
I am starting to study elastic optical network and I'm confused about the correlation between bandwidth channels supper channels does any one have a pdf file or slide of this subject? thank you so ...
0
votes
1answer
30 views
How do we communicate computers(NETWORK Adapter) using two different data encodings?
For example, one of the computers use NRZ encoding, and the other one use manchester encoding. How should the communication be? Or what would be the result if we used a repeater? Is it possible ?
0
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2answers
34 views
Developing 25+ device microcontroller/Zigbee network, how to avoid hard-coding polling addresses?
I'm developing a 25+ node XBee/Zigbee "star" type network with one coordinator and end routers.
To put it simply, it will be similar to a security system where all the nodes are "waiting" on an ...
-2
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1answer
46 views
0
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0answers
15 views
Do all random access procedures and packet transmission in NB-IoT happen during one Nprach-periodicity?
I have two questions about random access procedures of NB-IoT
In NB-IoT, Nprach-Periodicity is the amount of time between two consecutive random access transmission attempts.
Random Access procedures ...
0
votes
2answers
39 views
What is the theory behind these current equations? (for Z paramaters)
In the photo below is shown the method for deriving z-parameters of the circuit. Apologies for my badly drawn values for resistors as they weren't shown in the original image. Basically I'm struggling ...
0
votes
1answer
72 views
Function of MOSFET based circuit
I am curious to find out the functionality and working of below circuit.
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1
vote
1answer
56 views
How many WiFi networks can operate concurrently?
Very hard information to find since Google always falls down in how many devices can be connected simultaneously to a single one network.
Is there a limit to how many different WiFi networks can work ...
0
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1answer
76 views
Strange markings on SMT resistors
The other day, a network card was acting up (even thought the software didn't report any functional problems, the network didn't connect in duplex). On checking the board visually, I found these ...
1
vote
1answer
54 views
In sale or custom made?
RJ45 to 8 pos board connector.
Board connector width: 12,4 mm
Pin pitch: 2 mm
Found inside a plastic card printer.
Somewhere to purchase cable?
Identification of the board connector?
0
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0answers
45 views
Designing a wireless network of sensors
I'm designing a network of wireless sensors for an outdoor enviroment. It will consist of aprox. 30 sensors powered by battery (6 months autonomy), taking measurements with a low frequncy (max 10 ...
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 ...
0
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0answers
17 views
One Port Microwave Active Network Electrical Model
let's consider an active one port network:
My book does an analysis of it by considering the Poynting Theorem, in which we consider the contributions of active sources (electric and magnetic current ...
1
vote
1answer
144 views
Guard Band Reduction in 5G compared to 4G
Why is there less guard band required for 5G as compared to 4G .For 4G guard band are defined to be 10% of bandwidth on each side while guard band for 5G are defined in 3GPP 38.101-2. For ex If we ...
0
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0answers
55 views
Is there a RJ45 with magnetics for PHY less network switch
I have a network switch indoor and camera outdoor. I plan on having a PCB with RJ45 with magnetics. Can any tell me how to choose an RJ45 with transformer for a PHY Less network switch.
0
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1answer
119 views
A few questions about the application of ethernet controller and PHY chip and SFP module
I have a question about the connection/application between the ethernet controller and PHY/SFP modules.
Actually, there're so many scenarios for building up a NIC card, which makes me confused.
For ...
0
votes
4answers
85 views
Phase of Scattering Parameters
I do not understand the meaning of the phase of scattering parameters.
Let's consider for instance a two port network, and let's focus on S21.
I know that its absolute value represents a ratio ...
1
vote
0answers
165 views
Consistently assigning electrode nodes in random resistor networks
In the context of random resistor networks, the general question of interest is often "what is the effective resistance between two arbitrarily chosen nodes?"
But more specifically about the nodes we ...
0
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0answers
30 views
What does it mean, for poles and zeroes to alternate; Foster's Theorem
I'm currently learning Foster's reactance theorem;
The most general driving-point impedance Z obtainable by means of a
finite resistance-less network is a pure reactance which is odd
rational ...
1
vote
1answer
41 views
Graph theory for Networks
To use the formula,
[Bf][Zb][Bf'][I] = [Bf][Zb][Is] - [Bf][Vs]
for the concerned, or any tree, should [Vs] and [Is], be written with respect to the directed tree I've taken, or with respect to the ...
0
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2answers
163 views
-3
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1answer
88 views
Please help reduce the following circuit to an equivalent circuit with single resistor and source
Please help reduce the following circuit to an equivalent form as I am unable to understand the given solution in the book. If required I will share the solution later.
Thanks in advance.
@jonk, @...
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?
-2
votes
1answer
43 views
Output Impedance with Series Diode
Can someone explain how do i find the output impedance of the given cct?
The typical method involves attaching a voltage source at the output and shorting all independent voltage source (and open cct ...
0
votes
1answer
51 views
What's the purpose of the T568A/B's color wires?
I know that pair 3 in T568A is used for transmitting data while pair 2 is used for receiving data. In T568B the logic is reverse, meaning pair 2 is for Tx and pair 3 is for Rx.
What's the purpose of ...
-1
votes
2answers
87 views
Is there so much of a 'technological quantum leap' in 5G technology? [closed]
AFAIK, it is only the antenna hardware that goes into the smartphone/tablet and also the base-stations, where the technological breakthroughs can realistically be present. Every other component of the ...
0
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0answers
37 views
How to convert T matrix to Z matrix in two port network?
How can I transform a T matrix to become a Z matrix for a two-port network?
I found the following conversion to get the T matrix from Z matrix from here :
https://www.tutorialspoint.com/...
0
votes
3answers
255 views
Difference between 5G vs 4G in terms of energy consumption
I want to build a device that is expected to consume very little energy.
I don't know if it will be better to have it compatible with 5G or just leave to be compatible with 4G.
So, do the 5G consume ...
6
votes
2answers
137 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 ...
2
votes
4answers
397 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.
0
votes
1answer
250 views
Can I extend a single twisted pair DSL line using a coaxial cable?
I'm in the process of setting up a DSL modem/wifi router, which should be connected to a phone line that uses a single twisted pair. However, the phone line enters my house in a slightly inconvenient ...
1
vote
1answer
88 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 ...
1
vote
0answers
123 views
PHY Link only establishing 10 Mbps speed when both devices 100 Mbps capable
I've designed a circuit board with a Microchip switch (KSZ9897) going to a Ethernet-to-VDSL module (LX200V20).
The PHY ports between the two devices are connected using a transformerless connection ...
1
vote
1answer
334 views
How to solve infinite grid with the observing terminals at diagonal of infinite square matrix?
The answer given is 2/3ohm solution is not given but I can expect how they got that answer but can't justify the way.
-1
votes
1answer
74 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. ...
3
votes
1answer
140 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 ...
0
votes
2answers
48 views
can arduino UNO be programmed to measure the analog voltages of 6 resistor ladder network without using switches [closed]
6ea 1k resistors connected in series to +3.3v and Gnd.
Q how can arduino UNO A to D be programmed to measure the analog voltages of 6 resistor ladder network without using switches ?
0
votes
1answer
59 views
What does it mean by, “No voltage is applied”?
I've a very basic query.
If a question says, "no voltage is applied to the circuit" does it mean the battery is replaced by short-circuit (since, no voltage => 0V) or by an open-circuit (literally, no ...
0
votes
3answers
119 views
Earth Fault in a TT Network: Current loop, or charges flowing from one grounding to the other?
There are serveral things I (yet) don't understand about the T-T-earthing system. The most important one is that I don't understand which way the the current takes in case one of the conductors (for ...
1
vote
1answer
151 views
Direction of current flow in resistor networks
We have a simple resistor network \$g\$ with \$5\$ nodes and \$6\$ edges (resistors) as given below:
We assume all resistors have the same resistance (say \$1\$ Ohm, so homogeneously distributed ...
0
votes
1answer
45 views
What are the factors that affect delay/latency between base stations?
I am modelling a 5G network, with the uplink and downlink being decoupled and treated as separate networks.
I am exploring the integration of fog computing and how latency varies between different ...
