Questions tagged [network-interface]

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QSFP-DD to 8x 10G SFP+

I am trying to use a QSFP-DD port on an FPGA to breakout and interface with 4 or 8 SFP+ ports. I am curious if this is possible. From my research online, it seems like this all depends on the module ...
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2answers
551 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 (...
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1answer
70 views

What connector is this? (Inside a wifi modem)

I was about to attach an antenna to my 4g modem and thus trying to identify which connector is there on my modem board and i found this connector (4 of them, 2 for 4g and 2 for wifi). I tried ...
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58 views

Magnetic RJ45 question. PCB to PHY 8 pins vs 12 pins

So I am working on a design where we are replacing a RJ45 PulseJack J0011 connector that has the magnetic transformers built in with a RJ45/USB combo jack(with magnetic transformers). I found an ...
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0answers
35 views

W5500 network configuration issues

I have used W5500 hardware for my gateway device. It has been implemented in 80-100 locations. But in 4-5 locations I'm getting an unusual issue related to the network connection. The ethernet mode is ...
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25 views
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1answer
87 views

How to code communication between two enc28j60?

I am new to embedded programming and enc28j60. I am developing a project which includes two boards with Enc28j60. The working of the system is explained below. board 1 : It will request data from ...
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1answer
551 views

A TVS for lightning surge protection

A camera will be mounted outside and powered via POE to Aruba 2540 network switch. I don't want indirect lightning surge to travel into the network switch. I don't care if the camera gets destroyed. ...
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1answer
125 views

Why does the 10G XGMII specification mention a 32b instead of 64b bus for 156.25MHz?

I'm currently reading the IEEE XGMII specification (IEEE Std 802.3-2005 Clause 46) and I'm really surprised because it mentions a 32b data width for a frequency of ...
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6answers
64k views

What is the difference between Ethernet and Serial communication?

All the mouse movements, USB connections and other PC peripherals such as printers etc. are what is called serial communication. One bit per time. So far so good. But when it comes to TCP protocol, ...
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0answers
57 views

Do Broadcom's Ethernet chipsets need special software to operate?

I want to implement an Ethernet switch using Broadcom's chips. Are singing an NDA and getting the datasheets enough to work with the chips? I have heard that the chips must be programmed by a special ...
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1answer
21k views

How do I connect an Arduino to a landline?

How do I connect an Arduino to a landline telephone wall outlet? I'm thinking of home automation, something like: I call my house, and after a few rings the Arduino picks up the phone The Arduino ...
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5answers
75k views

Difference between Hz and bps

Does Hz and bps mean same? Can a signal be transferred at rate of say Mbps on a channel bandwidth of few Khz?
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1answer
333 views

Direct connection between two SFP+ cables [closed]

I have been reading a lot about modern fiber networking recently and I have a clarifying semi-hypothetical question: Imagine I have two 3-foot sections of Multi Mode Fiber, and four SFP+ 10G ...
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0answers
545 views

Ethernet Interface PCB layout requirement (if any)

I am doing Ethernet communication to/from an MCU. I got it working great with an ENC28J60 development module: https://www.digikey.com/product-detail/en/olimex-ltd/ENC28J60-H/1188-1044-ND/3471433 I ...
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1answer
418 views

Can we do source transformation for dependent sources? [closed]

In network analysis, during source transformation for dependent sources
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1answer
277 views

Using a NIC to do Wake on LAN? Or alternatives [closed]

I have a small linux system (kind of like a raspberry pi, but alot smaller and cheaper) that I want to use to back up files by rSync on a roughly-monthly basis. My problem is that the board doesn't ...
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4answers
29k views

difference between voice and data services?

What is the difference between the voice and date services. I have read that for voice services T1/E1 frame is used and for data services a frame with a standard header and payload nd tail is used ...
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1answer
60 views

Converted from ms per int to Hertz [closed]

I am trying to convert from ms per int to Hertz. I have found that my system takes 0.2313ms to transfer one 32 bit interger. Based on this answer Difference between Hz and bps I have divided my ...
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4answers
1k views

Lightweight Arduino network comms

Is there a lightweight networking framework to facilitate network communications between Ethernet/Wireless enabled Arduinos and Linux/Mac/Windows PCs? Implementing something like being able to read ...
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3answers
3k views

Connecting a RJ45 MagJack

I've made a few things now using a RJ45 jack and a separate pulse transformer. To make the design smaller i'm looking to use a magjak or a RJ45 connector with the pulse transformer built in. The jack ...
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1answer
308 views

Locating the Origin of 2.4GHz RF Transmissions

Is it possible? How would it work? Consider IEEE 802.11 (aka.Wi-Fi); for instance. There's such an incredible amount of devices out there, measuring and reporting WLAN AP signal strength (RSSI, RCPI, ...
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0answers
226 views

can i interface profinet protocol to ethernet interface?

i have a profinet device and an Ethernet port which is dedicated for KNX protocol. can i connect my profinet device to this Ethernet port?
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1answer
118 views

CAN bus physical layer configuration for more than two devices

I am designing a CAN bus for a light electric vehicle, likely using an Arduino CAN bus shield or similar. Using a single D-sub cable it's obvious that two devices could be connected together. The ...
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1answer
3k views

How do I fetch data from the internet with a GSM module using GPRS? [closed]

Recently I have built a device using Quectel (GSM/GPRS module) interfaced with Atmel MCU. It will control another device using SMS received by that GSM module. Now I am trying to connect it to the ...
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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 ...
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3answers
151 views

How large of an embedded system would be needed for a small internet host? [closed]

In the "Internet of Things" there is a push to incorporate net capability on appliances and household object to make then more user friendly. If trying to make a device which can be controlled through ...
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1answer
2k views

Problem connecting UART Wifi Module to PC

As refereed to my old question ( Connect UART WiFi module to PC ) which has been solved that days, I have a UART Wifi module ( this one ) and unfortunately I have problem again ! The point is, this ...
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1answer
716 views

How a modem really works? [closed]

I really searched a lot and couldn't find a detailed answer(s), what happens when the Network Interface Card sends a Ethernet frame to the modem? Does the frame directly go inside modem's cpu or ...
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1answer
4k views

How to design PoE splitter for Mode A and B

I would like to power my device via PoE, but I do not know which mode (A or B) is provided by the 802.3af power sourcing equipment (PSE). How should I design a splitter to accept both implementations: ...
2
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1answer
3k views

Carrier Wave in Wired Data Networks

I know this must be trivial for many... Which are the main reasons why line data is not modulated/demodulated in normal enterprise wired networks (in the sense that discrete voltage levels are used)? ...
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2answers
46 views

How is the capacity of link more for single network link

In networks capacity_of_link = bandwidth*propagation_delay My doubt is how can a same wire carry multiple signals? Is is because the wire is very long (still the wire can be either high or low). I ...
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4answers
6k views

Will having two antennae at the receiver give better reception?

I have a 300mbps router with two antennae (tp-link td-wd8968). I'm building a PC and looking for a wireless network card. I have seen seen cards with a single antenna (150mbps) and cards with two ...
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1answer
221 views

Can we consider that ethernet or RS-232 (RS-485) networks have no ground connection between the two ends of each cable?

This is for a huge home theater. I have a power transformer that converts 380VAC between two legs of a 3-phase power system down to 230VAC, with a center-tap of the secondary being our "neutral" for ...
4
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2answers
219 views

Two analog power planes for same voltage

I'm designing a board with LAN8720 and LPC1768. LPC's ADC and LAN's magnetics connections require analog 3.3V power. Should I separate these two analog power planes with a ferrite as I separate it ...
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2answers
417 views

How ADSL Demodulates (restores the order) the signal for dummies

I am not an electric engineer so sorry for questions that might miss some fundamentals. I am trying to understand the ADSL modem. The ADSL modem sends the data over different frequencies in parallel....
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2answers
516 views

Interface two Ethernet (10 Base) devices without 4 twisted pairs cable (Common ethernet cable) and 10 Base-T Filter

I'm autumn and recently working on a project that wants to connect two IC with part: ENC28J60 (that connects microcontrollers (with SPI interface) to Ethernet and LAN Networks) directly in a PCB board ...
4
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1answer
3k views

SFP pin requirement

I have a question regarding SFP pin requirements. The SFP pin descriptions can be found in the standard document found here. I'm currently designing a high speed LED transmitter and PIN-TIA receiver ...
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2answers
5k views

Connect UART WiFi module to PC

I recently bought a UART WiFi module (this one) and configured it (wireless configuration method) with right SSID but wrong password (and I don't know what it is). The problem is that I can't reset ...
1
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1answer
548 views

Which pins sense collisions at 100BaseT?

Background Suppose I have the following situation... PC with the NIC hard-coded to 100Mbps, Full-duplex RJ45 cable, pinned EIA-568B (not that the colors in the pinout matter) Cisco Catalyst 3560 ...
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1answer
126 views

Is USB a switched network?

I recently explained to someone why USB before 3.0 must use polling as opposed to interrupts here. Basically, from my understanding of I2C, USB is also a master slave architecture sharing a cheap 1 ...
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1answer
271 views

What ultimately determines the speed of electrical media

I have heard several myths about this. Some have said "thicker wires mean faster speed" which I don't believe. Others have said different voltages and others have said higher frequencies. Take Coax ...
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1answer
103 views

Are Data Cards simply L1 (Physical Layer) Devices?

I was just wondering, how many levels of the TCP/IP (OSI) Stack reside within a modem or a 3G data card and other similar networking devices? These devices do have a physical (MAC) address, which ...
20
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8answers
13k views

Cheapest way to add wifi to a project [duplicate]

I need low power wifi for a not-very-data-intensive application. What modules or chipsets should I look at? Other than low cost and low power, I have no restrictions. The cheaper the better. This ...
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2answers
2k views

How to setup a development network for the ENC28J60 on XP?

I'm working on an ethernet connection with the ENC28J60. During development, I'd like to connect the chip to my computer directly (i.e. not via a gateway). This ...
3
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4answers
5k views

Smaller alternative to RJ45 Ethernet connector

I am trying to minimize space usage for an enclosure that holds 48 boards with a RJ45 connector for Ethernet communication on each board. The boards work well with 10BASE-T (2 pairs) connection to a ...
7
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1answer
6k views

Half-Duplex Twisted Pair ethernet - which pair?

Which ethernet pair is used for half-duplex signaling? In full-duplex ethernet, 1,2 does TX; while 3,6 does RX. In half-duplex, in theory, only one of them is needed - which one?
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1answer
3k views

What does the M/M in RJ45M/M mean?

I have what I've been told is one of these cables, but not sure what it means.
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1answer
152 views

Connecting SATA to SATA [closed]

Is it possible to use the SATA interface to write data to it by PC and use the bus to transmit the data to another receiver SATA board ?
5
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3answers
8k views

difference between throughput and bit rate?

Throughput and Bit rate seems to have the same meaning and also have same unit of bits per second. Then what is the exact difference between throughput and bit rate?