72
votes
Is 30 Mbit/s fibre for WAN faster than 30 Mbit/s copper?
30 Mbit/s is the same speed, no matter if it runs over copper or fiber.
However, there are important link parameters other than link speed/pure bandwidth, so there may be differences. First, latency ...
- 81.5k
43
votes
Does having a longer Ethernet cable slow your connection?
No, it will not slow down a connection, but you need to be aware of the maximum length of a copper connection which is 100 meters. This needs to include the length of your patching cable from the host ...
- 2,016
35
votes
Does having a longer Ethernet cable slow your connection?
For all practical purposes, there will be no effect on the speed of your connection.
There will be a very insignificant amount of delay due to long cables. This won't affect the maximum speed of ...
- 451
29
votes
Accepted
Why does an Ethernet cable have four pairs?
10BASE-T saw first light as StarLAN that made use of the already existing twisted-pair category 3 telephone cabling (instead of the dedicated coax that 10BASE5/2 required). That cabling standard ...
- 81.5k
28
votes
Is 30 Mbit/s fibre for WAN faster than 30 Mbit/s copper?
30Mb/s is 30Mb/s, but ISPs usually sell you “up to 30Mb/s” because the speed of DSL technologies is highly dependent on the distance between your equipment and theirs.
With fibre, you are more ...
- 381
23
votes
Accepted
What is this thread-like material on this Cat6 U/UTP cable?
It is used to split the outer shielding away without needing to use a sharp object which could potentially damage the wires themselves. It is commonly called a ripcord.
Image taken from http://netx....
- 346
19
votes
Does having a longer Ethernet cable slow your connection?
Sort of, to a very tiny extent.
The longer your cable, the higher latency you experience - gamers call this "ping" time. However, the effect is about one nanosecond per foot of cable, which is ...
- 321
19
votes
Is 30 Mbit/s fibre for WAN faster than 30 Mbit/s copper?
You might consider pointing out to your "network engineering professional" that the propagation delay in copper is LESS that that of fiber (in most cases).
The difference between the two is ...
- 66.9k
18
votes
Accepted
Why do I need a crossover cable to connect devices of the same type?
When you need crossover cables is often explained, but why is seldom explained.
It has to do with the copper (often referred to as Ethernet) wire itself. In copper wiring, there are four pairs of two ...
- 14.8k
18
votes
Is 30 Mbit/s fibre for WAN faster than 30 Mbit/s copper?
It doesn't appear that any one has explicitly addressed the reliability of transmissions over fiber vs copper.
It may be true that, for example, your router is throttled to 30 Mbps, but the ...
- 281
14
votes
Accepted
The maximum length of CAT6 for intranet network?
Per the ANSI/TIA/EIA 568, Commercial Building Telecommunication Standard, UTP cabling is limited to 100 meters. That length assumes up to 90 meters of solid-core (better performance, but fragile) ...
- 98.3k
12
votes
Is 30 Mbit/s fibre for WAN faster than 30 Mbit/s copper?
Copper (ADSL or VDSL) specifies a maximum peak speed whereas fiber specifies a maximum average speed. My glass fibre (FTTH) connection is artificially limited to 50 Mbit/s average. At the start of a ...
- 221
11
votes
Can a single optical fiber support full-duplex communication?
Can a single optical fiber support full-duplex communication?
Yes. There are "BX" standards, e.g. 100BASE-BX, which use different wavelengths for send and receive. The transmit wavelength on one end ...
- 98.3k
11
votes
Accepted
Why is the Ethernet Connection Symmetric?
The very first Ethernet standards were designed for using a single, shared coax wire. There's no benefit in making the connection asymmetric in any way.
Additionally, network nodes are generally ...
- 81.5k
11
votes
Accepted
RJ45 Cable only has 4 wires
Your cable is not a proper UTP network cable as defined by TIA/EIA 568. In fact, the pairs used by the 10Base-T (10 Mbps) and 100Base-TX (100 Mbps) ethernet are 1-2 and 3-6. The 1000Base-T (1 Gbps) ...
- 98.3k
10
votes
Accepted
Multiple POE over a single cable
I know this is an older question, hopefully you've solved it by now, but I wanted to toss in my two cents, for the benefit of future generations if nothing else.
First of all, yes, ethernet and PoE ...
- 116
10
votes
Accepted
Does having a longer Ethernet cable slow your connection?
The electric signal will be slowed down by a minimal amount (afterall it travels at 2/3 light speed, more exactly at 0.64c, the velocity factor), how much time does light take to travel for 100 meters?...
- 216
9
votes
Why is the Ethernet Connection Symmetric?
Q: Why is ethernet symmetric (when compared to ADSL's asymmetry).
A: This is best explained by looking the technical reason for ADSL's asymmetry.
Quoting directly from wikipedia:
There are both ...
- 29.9k
9
votes
What is this thread-like material on this Cat6 U/UTP cable?
Its called a ripcord and is used to cut thru the outer casing of the wire so you don't have to use a knife. To those who say it is not strong enough your not using it right. Grab it with a pair of ...
- 91
8
votes
Accepted
Two computers connected by straight through Ethernet cable, communicating with APIPA addresses
Nowodays, many ethernet interfaces are 'auto MDI/MDIX'.
They detect the type of device connected and if needed reverse internally Transmit and Receive.
This allow connection of 2 devices of the same ...
- 19.4k
8
votes
Does having a longer Ethernet cable slow your connection?
I believe it can, but not in the way most people are thinking about.
Most are thinking of the extra propagation delay through the cable itself. This is valid, but as people have already pointed out, ...
- 81
8
votes
Why are patch panels used (instead of connecting directly to a switch)?
The horizontal cable needs to be solid-core cable. this type of cable gives better performance, but it is much more fragile, and it needs to to terminate in a fixed location, and not be moved after ...
- 98.3k
8
votes
Is 30 Mbit/s fibre for WAN faster than 30 Mbit/s copper?
Latency can make a connection seem to be much faster.
As an example, typical HTTP traffic downloads a number of small documents that each fit in just a few packets. Even while typical page sizes ...
- 504
7
votes
Accepted
CAT7 Ethernet cable: order of wires in the clamp
Category-7 cable has not yet been recognized by ANSI/TIA/EIA. The only currently recognized cables are Category-3 (still talking about eliminating it), Category-5E, Category-6 (may not be recognized ...
- 98.3k
7
votes
Accepted
What is "Twisted pair with loading" cable?
A twisted pair cable with loading is a cable that has added inductance.
It is a cable used for voice lines. A long span of twisted pair wires acquires capacitance and that's the case with voice ...
- 4,487
7
votes
Why do I need a crossover cable to connect devices of the same type?
This fact is applied only to the devices that don't have an auto sensing mechanism, which can detect the direction of the transmitted traffic on each pin of the 8 RJ pins.
When connecting same type ...
- 3,444
7
votes
Why do we need a crossover cable for 1000BASE-T?
Short answer: you don't.
1000BASE-T requires Auto Negotiation to work - the fast link pulses are to be transmitted and received on specific pairs, compatible with 10BASE-T and 100BASE-TX. In theory, ...
- 81.5k
7
votes
Accepted
Can Ethernet use fiber optic cables?
Ethernet uses a variety of cable types - an Ethernet cable can be pretty much anything. Ethernet has been using optical fiber for decades. The first standard was 10 Mbit/s FOIRL in 1987. The currently ...
- 81.5k
7
votes
What is the difference between Ethernet types, considering bandwidth?
Different types of Ethernet (standard Ethernet, Fast Ethernet, Gigabit Ethernet) have different speed of data transfer (10 Mbit, 100 Mbit, 1 Gbit). Why is that?
Progress - technology advances.
...
- 81.5k
7
votes
Unknown Network cable
The wiring exactly match the one given on this page so it is most probably an APC UPS serial cable
APC part# 940-0127B, 940-127C and 940-0127E
APC Pin USB Pin Description
1 1 USB +...
- 19.4k
Only top scored, non community-wiki answers of a minimum length are eligible