9
votes
Accepted
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, ...
- 19.8k
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 ...
- 68k
8
votes
Accepted
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 ...
- 8,876
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 ...
- 269
8
votes
Accepted
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 ...
- 101k
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 ...
- 88.1k
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Given the context which is severely outdated when not completely false, "infrared" seems to mostly refer to short-range low-bandwidth infrared communications as used: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 ...
- 873
6
votes
Accepted
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 ...
- 32.6k
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 ...
- 101k
6
votes
Accepted
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 ...
- 1,742
5
votes
Accepted
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 ...
- 88.1k
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, ...
- 101k
5
votes
Accepted
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 ...
- 16.4k
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 ...
- 68k
5
votes
Accepted
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 ...
- 88.1k
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 ...
- 181
4
votes
Accepted
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 ...
- 343
4
votes
Accepted
What does ISP's Internet speed actually mean
An ISP provides an uplink to the Internet with a specific line speed. That speed is the maximum bandwidth you can use for the very last part of a connection to another node anywhere on the Internet. ...
- 88.1k
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 ...
- 88.1k
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 ...
- 8,876
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 ...
- 41
4
votes
Accepted
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 ...
- 88.1k
4
votes
Accepted
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 ...
- 88.1k
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, ...
- 101k
4
votes
Accepted
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 ...
3
votes
Root path cost?
Switch B's root port will be G0/1. This is because the cost for each link is not what speed the port is capable of running, but the speed it is actually running. In this scenario, the link between ...
- 31
3
votes
Accepted
How does router do traffic control?
When the router's forwarding capacity is exceeded, ingress packets are dropped - the router physically receives the packets but due to lack of buffering they can't be stored.
When the downlink's ...
- 88.1k
3
votes
how to make udp reliable
One way could be to use Reliable UDP(RUDP or RDP). The idea is, the sender sends all packets as normal UDP packets and the receiver indexes all the packets. Once all the packets are transmitted, the ...
- 131
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 ...
- 16.4k
Only top scored, non community-wiki answers of a minimum length are eligible