# Questions tagged [network]

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68 views

### What is the current across the resistor given in the figure? [closed]

The circuit is short circuit across the the resistor. What will be the current flow across the 30 ohm resistor?
16 views

### How do the 5 elementary two-port networks map to unbalanced networks with a common ground?

Background (questions below) I've been trying to understand how to use S/Y/Z/A-parameter matrixes to create circuits mathematically with 2-port components in series, parallel, and ground-shunt. For ...
• 874
52 views

### Reflection in optical fiber

I took a measure (OTDR) of optical fiber from the headend and I got this : In 10.7km The optical fiber have a "reflection". This reflection is holding 500 meters. After that reflection down ...
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### Guidance on cables in parallel from visualisation

I've been told cable 1 is in parallel with cable 2 and 3 yet I'm not visualising it just yet. Could someone clarify whether it's that from the source there are 2 paths? Cable 1 and cable 2-3. Thanks
36 views

### MV grid topology?

In the vast majority of cases, a resonant grid (compensation with Petersen coil) is adopted in MV grids. Grid capacitance is compensated by the inductive component of the Petersen coil. Since cables ...
67 views

### How does line capacitance of overhead naked lines change with rain or snow?

Does line capacitance change with rain or snow? If yes, does it a lot (or is there a study that quantifies the change)? I ask it because I am studying the tuning of a Petersen coil, and I want to know ...
1 vote
49 views

### Is Petersen coil in resonant network tuned also for capacitor banks?

Petersen coil is tuned every 2-3 minutes to compensate for a certain percentage of capacitive current in resonant grids during earth faults. But, if capacitor banks with ground connection are switched ...
228 views

### STM32 + LwIP + DP83848 - No results when I ping

I have made a PCB with an STM32F407 processor and I have been used DP83848 Ethernet PHY. For STM32F407 processor. I have selected RMII settings. The pinouts for the RMII settings. Red rings got to ...
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49 views

1 vote
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### Connecting two-port network theory to microelectronic design (Sedra and Smith)

I am trying to connect what I'm learning in Sedra and Smith (I am currently in Chapter 7 of the 7th edition which talks about basic transistor amplifier configurations, eg. CS) to what I have learned ...
• 419
319 views

### STM32 ethernet and TCP issues with firmware 1.27.0 and cubeide (probably at sending messages)

I would like to use the TCP/IP protocol (with LwIP, HAL library, without freeRTOS) in a project but I face some portability issues. I'm starting with TCP echo client example as in chapter 6.1.1 of ...
71 views

### What is the phase difference between phases in 3phase system, if system becomes unbalanced

Is the phase difference between the voltage phase 120 degree in an unbalanced system if not what how can we calculate it? I will try to explain this a litte more clearly. More specifically in this ...
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### Distributed Bayesian Detection with a two sensor tandem topology and unknown parameters

If you don't know the correct keyword, you can still miss a key literature search: I have a problem in distributed Bayesian detection with a serial (or tandem) network topology. The probability ...
1 vote
95 views

### Need help on resistor calculation

I'm currently work through an application note from Texas Instruments about building a programmable power supply. The base concept is fine and I understand it, now I'm trying to go through the ...
1 vote
85 views

### Is this how cable networking works? [closed]

I am studying about how cable networks transmit data to various TV channels on our TV screen. It is fascinating to see how they work. After studying different articles online, I have made points as to ...
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48 views

### Method for minimizing relays in a switching/steering network - combinatorics algorithm?

I'm developing an industrial power device which has multiple power supplies that need to be multiplexed to multiple outputs (MIMO) through a network of relays. Similar to how digital logic can be ...
73 views

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### CAN Bus Topology, is it possible to have "T" shape topology?

I know that for a thumb rule, it is possible to have a length of CAN Bus network with: Speed [Mbps] * Length[meter] < 50 . i.e., with 0.5Mbps, it is possible; source. But, is it possible to have ...
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### What is the ABCD matrix of an impedance step?

What is the ABCD matrix of the following configuration, where a transmission line with characteristic impedance $Z_0$ is connected to another line with characteristic impedance $Z_1$ (if we ...
• 101
64 views

### From delay to distance?

I need to estimate the distance of a link having only delay values. How can I do that? I need to estimate this distance for ethernet and optical fiber links. I thought of doing it using the ...
703 views

### Difference between KVL and mesh analysis

Are KVL and mesh analysis, the same? I am confused. What is the characteristic difference between them?
279 views

### Voltage and current [duplicate]

It is proven only when there is a potential difference current flows in that branch between two nodes, then how we say that the current flows in a short circuit where the voltage on that branch is 0?
1 vote
107 views

### What is the maximum transmission power of a 4G/5G phone with multiple antennas?

As we know, a user equipment (UE) can transmit its traffic with the power up to 23dbm. However, there is few materials mentions the maximum power a UE can apply if it has multiple antennas. In this ...
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41 views

### Ethernet Network Switch MAC address

I want to learn about the RSTP,STP supported network switches. As I know, the BPDU frames have 802.3 Frame Structure. For example switch have aa:bb:cc:dd:ee:00 base MAC address. When I check the some ...
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### What is it called when a WiFi chip advertises its own SSID so users can connect

I am not sure which stack should I post this, but here is my question: when you buys these WiFi-enabled gadgets, when they turn on they advertise a SSID where you can connect to it and enter your ...
• 573
2k views

### How does the network card determine the cable length?

I have an older Gigabyte Technology GA-MA770T-UD3P motherboard with an on-board network card described like this: ...
• 303
367 views

### Find current 'i' using Nodal Analysis

Here I know how we apply nodal analysis, but can somebody explain how can we calculate the current 'i' if there is no resistor in that particular wire? I have shown my approach and working so far. I ...
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876 views

### Difference between master and slave devices in communication network

I am a rookie in network engineering and what I don't understand is the master-slave communication. According to Wikipedia,'Master/slave is a model of asymmetric communication or control where one ...
• 559
1 vote
89 views

### High-speed Network Link between two Processors without Cable

My goal is to set up a high-speed network link between two identical processors (Qualcomm SOMs) that will be present on the same PCB. Since I have severe restrictions on weight I cannot use the ...
78 views

### Transient analysis of parallel RLC circuit

Here, I am solving this circuit where Capacitor acts as a voltage source of 10 V. Switch is closed at t=0,and Vc(0-)=10V,I2(0-)=0. When t≥0, what will be the time constant and frequency of the circuit?...
1 vote
53 views

### Magnetic coupled circuit

I am solving this circuit and according to the dot convension,the j6 ohm and j8 ohm have opposite polarities. Applying kvl to both loops, I got, 10 = j5I1 - j3I2 + j3I2 Or, I1 = -j2 A But I am stuck ...
45 views

### Regarding behaviour of a branch between two independent meshes

I'm trying to understand how a branch not part of loops affect the circuit. In the following, I can apply KVL on the two loops (supermesh and the one on the right) and I get the correct answer. The ...
372 views

### Regarding transient analysis of RC circuit

Here I am trying to find the input current I(t) and Vc(t). From my calculation, it's evident that Vc(0+)=Vc(0-)=0V and Vc(∞)= 10V but I am confused about the first capacitor. When t=0, it acts like a ...
162 views

### How does this T-network op amp function as a boost filter?

Supposedly this circuit is supposed to be a bass frequency booster. I've been using this article as a reference, although the circuit they analyze is a different layout than mine. I apologize if my ...
78 views

### two-port networks with voltage sources connected on ends

Suppose we have a two-port network. Then, we connect voltage sources V1 and V2 to the left and right end. For the transmission parameters, t11=V1/V2, then could one use the voltages given by the ...
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1 vote
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### What is the difference between circuit switching vs virtual circuit switching data communication?

The circuit switching method of data transmission which was used traditionally is way too similar to the virtual circuit switching (packet switching) communication technique. What is the difference ...
28 views

### How would it be possible to avoid contention for a Network on an SoC (or more specifically an FPGA) from two or more nodes?

In a classical chip, you have a main CPU to perform general processing and it acts as the master on a some bus and other slaves (IO, Memory) usually do not send command or data autonomously. (or at ...
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### In transmission line does reflected wave travel on the path before impedance or after impedance?

I was taught in class that 2 port RF networks have the following structure below, where V2+ is the reflected wave if load at end of port 2 does not match the characteristic impedance of lines at port ...
158 views

### Implementing our own network physical layer for fun (e.g. Ethernet) - is it too difficult? what is the suggested approach?

We are interested in creating our own network stack. For the other layers (application layer ~ link layer), I have done Stanford CS144 and CMU 15-441 so a toy has been implemented. However, I have no ...
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1 vote
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### Send or share DI data through network advice

i want to collect some data(DIs from some relays) and send them or use them in a network and finally put them in a DataBase like SQL, and i want it to work 24/7. after searching i found some solutions ...
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187 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 ...
1k 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 ...
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1 vote