Questions tagged [network]
The network tag has no usage guidance.
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0answers
28 views
Relative merits of ArcNET vs CAN [closed]
What specific, measurable advantages or disadvantages does ArcNET possess relative to CAN in an industrial control setting, in terms of:
Performance (e.g. Data/message rate, timing predictability)
...
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0answers
45 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 ...
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1answer
87 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
35 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
77 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
10 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
40 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
108 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 ...
0
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1answer
29 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 ...
4
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1answer
90 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?
...
0
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1answer
25 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
62 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
36 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 ...
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1answer
52 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
149 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
15 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. ...
0
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1answer
27 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
35 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
88 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 ...
1
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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
104 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 ...
-1
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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
55 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 ...
0
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1answer
60 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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0answers
35 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}
\...
0
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0answers
174 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
79 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
666 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 (\...
0
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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
142 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 ...
0
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0answers
19 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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0answers
31 views
Medium length transmission pi model
My question is regarding medium length transmission line calculations, hopefully someone has studied them.
Usually I am given the voltage, active power and power factor at the receiving end of a ...
0
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0answers
21 views
Practical assumptions for accomodating cellular, D2D and M2M devices
Question: Given Assumption 1 in a network model which accommodates device-to-device (D2D) communication within a cellular network in the underlay and overlay, make an assumption to accommodate machine-...
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3answers
364 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 ...
0
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0answers
481 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 ...
-1
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1answer
76 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....
1
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2answers
69 views
Interactions between Ideal Voltage and Current Sources
Last week I asked a question involving a linear network involving ideal current and voltage sources. You guys gave me some great advice as to how to approach those types of problems. However, this ...
0
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1answer
97 views
How to explain why equivalent resistance between two points in this network is dependent on specific resistance?
The original network is an square network with two diagonals as you can see here there is no intersection between the diagonals.:
The question is what is the equivalent resistance between points A ...
1
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1answer
369 views
Altium hierarchical design assigning net to power port/port
I have a hierachical multichannel design and I´m having problems to set properly the project properties so that the following issue is removed.
As you can see one of the ports of the child sheet is ...
0
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1answer
426 views
Finding voltage drop on a resistance using mesh analysis
How to find out Vx on the specified resistance using mesh analysis?
simulate this circuit – Schematic created using CircuitLab
Here Vx is to be found out on the 1 ohm resistor.
I tried ...
3
votes
1answer
213 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 ...
0
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0answers
217 views
Problem in connecting to a server waiting for a TCP request using ESP8266
I'm using ESP8266 for connecting to a appspot-preview.l.google.com server which listens for TCP request and answers back a number (it's for training purposes).
...
17
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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 ...
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0answers
130 views
Ouput impedance of a balun
I am using the CC1110 RF IC and I am having trouble when matching the differential RF output impedance with the antenna. The datasheet states that the differential impedance seen from the RF output ...
0
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2answers
315 views
KSZ8895 Switch-Circuit Problem
For an application I am trying to get a switch running using the KSZ8895 (standalone). For testing, at first, I connected it only to MagJacks.
If I test the circuit and connect two PCs, this worked (...
1
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1answer
111 views
Can we do source transformation for dependent sources? [closed]
In network analysis, during source transformation for dependent sources
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1answer
82 views
Can you use a amplifier and a satellite antenna to boost a GSM signal?
I have a small GSM Modem whose internal antenna sucks. I bought a small external antenna that boosted the signal a little, however I want to boost it more. Would using a typical high frequency audio ...
2
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0answers
340 views
Bus interface for short distances, many device data exchange - CAN, RS485? + characteristic impedance and media capacitance
I ran into some troubles trying to design a wired bus which will connect in about 64 testing devices. My first choice of mind was CAN bus, known of it's reliability and low EMC interference. However, ...
