Questions tagged [network]
The network tag has no usage guidance.
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Why doesn't my Ethernet controller work? [on hold]
these are my verilog project. I want to develop a Ethernet Controller by FPGA. My FPGA built-in RTL8201CP(100Mbps, Full duplex) and 25Mhz E_TXC clock input FPGA(4-wire * 25MHz = 100Mbps).
But my ...
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0answers
53 views
Devices involved in anti jamming [on hold]
One of the techniques to deal with jamming is direct sequence spread spectrum (DSSS), where the sender multiplies the original message with a some random sequence to obtain the spreading gain, and the ...
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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 ...
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0answers
44 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 ...
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1answer
56 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.
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0answers
21 views
Configuring Xbee3 Mesh role from a microcontoller
I am looking to set up a Zigbee Mesh Network using the Xbee3 module, but a question that I have is would I be able to configure this network (and even change roles) “on the fly” using an STM ...
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0answers
13 views
Average and maximal number of time slots in adaptive tree walk protocol
I was wondering if it is possible to know the maximal and average number of time slots that will pass until and including the time slot in which there will be a successful broadcast, knowing that two ...
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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'...
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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. ...
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0answers
47 views
What is maximum symmetrical output voltage swing in this case?
I'm pretty new to Electronics and hence the following doubt. I could not understand how the authors reasoned out the swing limits for this problem ((b)-part only)
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0answers
20 views
calculating the probability of a successful broadcast in p-csma protocol
am quite unsure with the following question. would appreciate your help with it:
in a 3 stationed p-csma network, where \$p=0.3\$, we know that in \$t_0\$ the network is restarted, the channel is ...
3
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1answer
126 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 ...
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2answers
45 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 ?
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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 ...
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3answers
43 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 ...
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0answers
50 views
a tricky question regarding CDMA with 4 stations
i have encountered this tricky questions that left me really confused, would really appreciate your insight regarding it:
given a cellular system with four stations that utilizes CDMA.
given the ...
1
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1answer
97 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 ...
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1answer
40 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 ...
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2answers
80 views
Shifting of current sources [closed]
Can someone justify shifting current sources iam not able to understand how it is done
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1answer
12 views
Two port network z parameter determination
I would like to know how it is solved in book as I found that it is way quicker than the way I solved. Any detailed explanation will be appreciated.
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0answers
41 views
Wifi coaxial cable type unknown
Quick question, I was unable to identify the coaxial cable type used in wifi devices(routers ,tablets,etc.) , very thin grey cable approximately 1mm in outer diameter, I need to know the type so I can ...
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2answers
133 views
Fitting of continuous transfer function
I measure a network's transfer function using a network analyzer and therefore have a set of complex data points, representing the network's gain and phase. I wish to fit a continuous, rational ...
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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 ...
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1answer
101 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?
...
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1answer
114 views
Difference b/w Symmetric and Reciprocal Networks
A circuit exhibits symmetry when interchanging ports across a plane of symmetry results in no change in the impedance, admittance or scattering parameters of the circuit.
Reciprocity also means ...
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1answer
93 views
How to understand Transmission and Propogation delay formula
I have three questions below. I would like to understand how their respective answers were reached, this is a question in my current class and everyone in the class has A-Level mathematics experience -...
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0answers
42 views
Determine Y-parameters for given circuit. [Used Nodal Analysis]
I am trying to solve this circuit for past 3 hours, no success, so I am posting here.
simulate this circuit – Schematic created using CircuitLab
I used nodal analysis, I will go over the ...
0
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1answer
53 views
Trouble with instrumentation and simulation of the common-mode response of a filter
I have been struggling to obtain the Bode plot of common-mode response of a filter. I first simulated it using LTspice, then I used a USB network analyzer. Both do not match each other and to the ...
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1answer
254 views
Calculating total resistance between two points (triangle resistor network)
I want to calculate the total resistance between the 2 points: A, B.
I've tried using the Delta-Wye method, but I'm not sure how to apply it to my problem since there's 6 resistors and not 3 (usually ...
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0answers
16 views
deriving an equation for wireless network capacity
I'm trying to derive an equation for wireless network capacity given topological constraints of the nodes and certain obstacles... but before I get that far, I want to understand the most simple case. ...
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1answer
28 views
Can a dependent voltage/current source have some impedence/admittance,respectively?
Im studying 2-port networks, for Z parameters equations, there is general equivalent circuit given, in which dependent voltage source is given, I do know about dependent voltage sources, but do these ...
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2answers
42 views
Network Analysis for finding power delivered
We need to find the power delivered by the 5V source in the above network. I usually apply superposition theorem when I need to find the power delivered by a source when there are many power sources ...
1
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1answer
123 views
Calculating input impedance of 3 port network
I am trying to derive a expression for calculating the input impedance of a 3 port network to use as direct calculating code and avoid SPICE/simulator solving of the same.
I am able to solve the ...
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1answer
40 views
Purpose of Bus Analyzer
I've not found the clear explanation for the WHY we use the bus analyzer except to capture and analyze data across the communication bus. Yes, we observe message structure, such as command words, ...
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2answers
127 views
How to determine the physical location on a RS-485 daisy chain / bus topology?
I am trying to build a "daisy chain" using several Arduinos and MAX485 transceivers. All boards have a temperature sensor attached to it. A 9V battery supply all boards in the chain.
I am trying to ...
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2answers
75 views
What communication method shouild I use [closed]
So I wan to control a bunch of devices.
I though first of using RS485 but after some digging I figured out this might not work as I don't really have a pure daisy chain.
The configuration I would like ...
0
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3answers
56 views
Hardware requirements for 10Gbps line rate packet processing
How do I calculate the horse power required for worst case packet processing scenarios?
First, a little more background, I'm building a device for packet analysis. My test box currently runs on Linux ...
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1answer
63 views
Impedance Matching Network with tracks+connectors in between (practice)
I've been struggling on how to design (and develop in practice) an impedance matching network with some traces/tracks/paths (whatever you wanna call it) and some connectors in between. So here is the ...
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1answer
51 views
Bounds of impedance matrix of a passive two port network
If we consider the impedance matrix of a linear, reciprocal passive network (Z12 =Z21 because of the reciprocity),
$$
\begin{bmatrix}
Z_{11} &
Z_{12} \\
Z_{12} &
Z_{22}
\...
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0answers
204 views
How to get the transfer function of electrical network using nodal method
We have the following circuit:
I am trying to get the transfer function using the Mesh Method. The first equation I've got is:
(s+1) I1(s) - sI2(s) = Vi(s)
The ...
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1answer
89 views
Resistance or conductance of resistor networks
I am trying to figure out if the equivalent resistance (or similarly conductance) of a resistor network can be calculated using Qucs (as opposed to solving the Kirchhoff equations directly, or doing ...
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5answers
749 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 ...
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3answers
26 views
power network consumption vs network resistance [closed]
I have a simple question. Based on Ohm's law, \$V=I\cdot R\$, by increasing the resistance, if the voltage is fixed, the current will drop. By dropping current, the consumption or the loss will drop (\...
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1answer
68 views
Transmission and propagation
Two stations are 400km apart from each other. You have access to a 100Mbit/s full duplex radio link which transmits packet of 4000 Bytes in each direction.
What is the transmission time?
I assume ...
26
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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 ...
0
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2answers
155 views
What are the different antenna types used by various IEEE 802.11 standards?
I've been working on an assignment about the IEEE 802.11 standards and I've had some trouble with one aspect of a question. I need to explain the differences between various features of the different ...
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0answers
22 views
Orientation of eNode antennas
What type of omni-directional antennas is used at an LTE base station, also known as eNode? and What is the orientation of such antennas? and how come the 3GPP path-loss model for such antennas is ...
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3answers
477 views
Kirchoffs Law for 3 Loop Circuit with Multiple Voltage Supplies
I am working on the below circuit to find; the power dissipated by RL (8Ω resistor), voltage drop across RL and current supplied by the 10 volt battery (V1).
So far I have used Kirchoff's law to the ...
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0answers
548 views
How to create a J1939 ID that have a PGN = 0x130?
I'm trying to create a J1939 message with a PGN equal to 130.
But I couldn't determine how the ID is going to look like in order to get that exact PGN.
Can you please share a suggestion?
Thanks a ...
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1answer
91 views
Determining the voltage of a network branch
[NOTE-This is a not a homework problem and i am not asking anyone to solve it]
Recently I have been simulating some basic circuit analysis problems in a simulator to get a better feel of the topic....
