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17 votes
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How can a processor handle 10 Gigabit per second or more data rate?

You are totally correct, if we have to use an instruction cycle per bit then 10Gbps would be unachievable. So the first thing to note is that we handle a word per CPU instruction -- 64 bits. Even then ...
vk5tu's user avatar
  • 1,171
9 votes
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iperf: send specific volume?

The -l option is for the buffer and doesn't influence the amount of data transferred. You have to specify the desired amount of data with the client-only option -n in KByte or MByte. So for 10GB, ...
JFL's user avatar
  • 19.7k
8 votes

Speed benefits when switching LAN from 1Gb copper to Fiber Optic

You are conflating many things here, so let's try to detangle the issues in your question. Data rate is data rate, regardless of the physical medium. A 1Gb connection has the same data rate whether ...
Ron Trunk's user avatar
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8 votes
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Cisco Router (ISR4221) Throughput - Why so slow?

That's by product design. ISR 4k come with a platform shaper (upgradeable to ~2x the value by license upgrade with the "PERF" license). Cisco say that the limits of the platform shapers can be fully ...
Marc 'netztier' Luethi's user avatar
8 votes

Why is microwave faster than infrared as a transmission medium?

Faster in terms of propagation delay? @Zac67 answer is good. Faster in terms of data throughput? Here, infrared has a huge theoretical advantage. The whole microwave range consists of about 300GHz ...
fraxinus's user avatar
  • 269
8 votes
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100Mbit vs 1Gb/sec transferring 10MB file...speed difference?

The bandwidth is how fast an interface serializes bits onto the wire. Obviously, a 1 Gbps interface serializes bits 10 times faster than a 100 Mbps interface. With everything else equal, a 1 Gbps ...
Ron Maupin's user avatar
  • 99.8k
7 votes

Why is microwave faster than infrared as a transmission medium?

I've read that microwave is a faster medium of transmission of data than infrared. It's not. Light moves at the speed of light (c0), (pretty much) regardless of its wavelength - in reference to the ...
Zac67's user avatar
  • 84.9k
7 votes

Why is microwave faster than infrared as a transmission medium?

Given the context which is severely outdated when not completely false, "infrared" seems to mostly refer to short-range low-bandwidth infrared communications as used: In many TV remote ...
jcaron's user avatar
  • 783
6 votes

The recommended settings for giga ethernet connected to Ethernet port

In reality, the legacy 10 Mbps ethernet interface probably can't negotiate, and it can probably only do half duplex (very few 10 Mbps interfaces can do full duplex). You should let the 1 Gbps ...
Ron Maupin's user avatar
  • 99.8k
6 votes
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Better throughput with 100 Mb NIC setting

This is a buffering issue. I had the same problem with a new Level 3 circuit. Their NID apparently has no measurable buffers, so feeding it at a rate 10x the circuit rate (1000 vs. 100) leads to all ...
Ricky's user avatar
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6 votes
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Fiber to copper conversion, what are the odds?

Fiber media converter is a small device with two media-dependent interfaces and a power supply, simply receive data signals from one media, convert and transmit them to another media. It can be ...
Cow's user avatar
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5 votes
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The recommended settings for giga ethernet connected to Ethernet port

The very short answer: don't configure anything. Auto negotiation (or the lack thereof as Ron's detailed) works only when it's left alone. Manual settings can very easily cause problems either right ...
Zac67's user avatar
  • 84.9k
5 votes

Fibre vs Copper short Distance

The equipment interfaces determine the speed, albeit the medium used may have restrictions on which interfaces it can be used. If you have 1 Gbps ethernet, it doesn't matter if it is copper or fiber, ...
Ron Maupin's user avatar
  • 99.8k
5 votes
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Will the data transfer with the destination on the same LAN network be routed through the internet when the WAN IP is used?

I assume you're talking about a structure like this: F | ISP | R S | | ===+===+===+=== | C If your router supports so-called "hairpin routing" (or "hairpin ...
jonathanjo's user avatar
  • 16.3k
5 votes

Relationship between full duplex and speed

Full-duplex data transmission means that data can be transmitted in both directions on a signal carrier at the same time. That is incorrect. It means devices can transmit and receive at the same ...
Ron Trunk's user avatar
  • 67.7k
5 votes
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Static speed and duplex/no-negotiate causing input error

If you disable Auto Negotiation (AN) you need to make sure that both sides are configured in exactly the same way. There's isn't any point in doing that manually, actually, so you should have AN ...
Zac67's user avatar
  • 84.9k
4 votes

Switch Buffer Sizing

First, there is a relationship between buffer size and latency only if there is congestion in the path (too many incoming packets on the input interface, or too many packets for the switching engine (...
mere3ortal's user avatar
  • 2,416
4 votes

Can I increase throughput and decrease network latency by installing multiple NICs?

This is an interesting but complicated topic and like most things engineering the answer is: It depends! In this case the lack of detail adds ambiguity (I'm not allowed to comment asking for ...
MerlinTheMagic's user avatar
4 votes
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Does the direction of a throughput bottleneck matter?

If a network has a throughput bottleneck, does it matter whether the slow link comes before or after? No it doesn't, Only matters when destination is before or after that bottleneck link. What ...
Anirudh Malhotra's user avatar
4 votes

Speed benefits when switching LAN from 1Gb copper to Fiber Optic

Working with network shares, the #1 bottleneck is usually the server, not the network. For 20 users each simultaneously moving 400 Mbit/s, the server would have to cope with 8 Gbit/s which is quite a ...
Zac67's user avatar
  • 84.9k
4 votes

Cisco 892 Low WAN Speeds

Slightly better than 350Mbit/s? That's probably about as good as it's going to get with an 890 series and with NAT. NAT is probably causing the CPU load, here. Don't forget: This product range is ...
Marc 'netztier' Luethi's user avatar
4 votes

Transferring data speed of Fast Ethernet

You'd be correct. However I'd say that what you're referring to as a packet should be considered a file. This is because the data of the file will be truncated (as you put it) into smaller bites of ...
SouthPoleElf's user avatar
4 votes
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Bandwidth limit between CPE and Provider Equipment

There is no interface rate that runs at precisely 15 Mbit/s. The most common handover interface is Ethernet which exists for 10, 100, 1000 Mbit/s or faster. Your plan's data rate is implemented as ...
Zac67's user avatar
  • 84.9k
4 votes
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Copper or Glass for Low Latency?

You already provide most answers. Propagation delay: apart from (good) coax, copper and fiber are nearly equal. Decent twisted pair is slightly faster than fiber, high-quality TP even more so - but ...
Zac67's user avatar
  • 84.9k
4 votes

Static speed and duplex/no-negotiate causing input error

By manually setting the speed and duplex on one side with automatic detection on the other side, the side with automatic speed will detect (not negotiate) the correct speed. For the duplex, ...
Ron Maupin's user avatar
  • 99.8k
4 votes
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Why is microwave faster than infrared as a transmission medium?

As others have pointed out, both are (almost) the same in terms of propagation speed. I'm assuming the difference is in data rate. Microwave comms are based on circuitry which can be specifically ...
Cristobol Polychronopolis's user avatar
3 votes

Calculate max transfer speed in LAN network

I'd worked in networks for a very long time before I learned that the ethernet "Mbit/sec" speeds are 1,000,000 bits; while obviously we normally think of 2^20 for amounts of bytes. Threw my ...
jonathanjo's user avatar
  • 16.3k
3 votes
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Calculate max transfer speed in LAN network

The maximum throughput on the application level depends slightly on the used transport protocol - UDP adds 8 byte header overhead, TCP adds 20 byte. The IPv4 packet uses 20 bytes and the Ethernet ...
Zac67's user avatar
  • 84.9k
3 votes

Calculate max transfer speed in LAN network

1Gbs is one Gigabit per second, while 3MB/s is 3 Megabyte per second. (Byte is noted with a capital B, while bit is noted with a lowercase b) Since 1 byte = 8 bit, you achieve a speed of 24Mb/s ...
JFL's user avatar
  • 19.7k

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