Questions tagged [cable]

For questions about physical cables used in a computer network topology. This tag is suitable when your question is about a network cable. Examples: Twisted pair cable, Fiber optic cable, Coaxial cable, Patch cable and other specialized network cables.

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9
votes
3answers
5k views

Why one of the pairs on Ethernet is not adjacent?

I know that Ethernet over twisted pairs have two standards as the figure below: The pairs are twisted to avoid cross-talk. But why in both standards there is one pair that is not adjacent (pin 3 ...
2
votes
1answer
1k views

Network Cable Installation SOP

I'm looking to write out an SOP for a network installation project involving WAP installs back-hauling to existing telecom rooms/racks. It needs to be standards based, and I've found plenty of info ...
0
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1answer
2k views

What type of cable is a cat 7 : UTP or STP ?

I'm a ICT engineering student studying networking. I was wondering if someone could tell me what type of a cable Cat7 is ?
15
votes
5answers
99k views

What's the difference between an Ethernet cable and a UTP cable?

Is there such a thing as an Ethernet cable or technically no? Are they actually called UTP cables? From wikipedia UTP cables are found in many Ethernet networks and telephone systems.
1
vote
1answer
435 views

Will cutting a 50m CAT6 cable in half achieve a gigabit connection?

I have a new CAT6 cable that's 50 metres long and only performs at 100 megabit. I've tested it in a variety of gigabit ports and it never allows a gigabit connection. Is it the length that's the ...
6
votes
3answers
2k views

Ethernet Cable Orientation

I'm in an A+ course and was just working on wiring Ethernet cables. I was wondering, will an Ethernet cable function if the wires are reversed? Say instead of wiring 568B like striped orange, orange, ...
5
votes
1answer
12k views

How to repair a break in a long Cat-5e cable run

I have a long run of Cat5e which is broken at about 20' from one end. Replacing the entire cable isn't an option, as it's fairly long and is going through walls and such. Searching this on google ...
8
votes
1answer
2k views

Internet Cable Has Been cut in two and taped back together

Let me explain, we have a two analogue lines (something like 16 pair each, the standard cable that's put into buildings) that come into our building but they pass through the building next door. ...
1
vote
1answer
199 views

Externally Rated - CAT Cables - how to tell

How can you tell a CAT6 cable is externally rated? It is a requirement for a project I'm working on. Many thanks, Vlad
1
vote
1answer
2k views

Is F/UTP cabling compatible with an STP patch panel?

I've been given the job of wiring up a small office network, and been given F/UTP CAT6 cable to work with. Is a patch panel describing itself as "STP" compatible with this cable? As I understand it,...
3
votes
4answers
4k views

What is the maximum distance for blowing optical cable through pipes?

What is the maximum distance for blowing optical fiber cable with compressed air through pipes? The method known also as Cable jetting. Taking into consideration no lubricant is used. I am asking ...
1
vote
3answers
5k views

Preferred method splicing together UTP cable

I was wondering what the preferred method is for 'butt'splicing together two pieces of <100m UTP cable - or if that is discouraged in general. Relaying the cable is not possible, but it does need ...
9
votes
2answers
751 views

Multi-drop Cat5e/6 Cable?

I'm looking to install ethernet ports in a small business. There are 7-8 groups of cubicles each with 4 desks. Ideally I'd like to run a cable to each desk but if my math is correct I'm looking at ...
20
votes
7answers
60k views

Minimum Ethernet Cable Length?

I have heard from a few people that cables less than 1 meter are prone to transmission problems. Is there any minimum copper cabling length? Please explain if this is true or not and share any ...
4
votes
1answer
762 views

QoS for IP PBX behind DOCSIS modem (SIP trunk without direct routing by ISP)

I want to run a PBX behind a firewall behind a DOCSIS modem. Our ISP does not want to deploy a TA / gateway at our site. Our ISP only uses the modem for analog telephony and nothing else. QoS for ...
3
votes
1answer
1k views

Cable modem ARP behavior [closed]

I have three layer 3 devices in a pretty simple topology: PC1 -> [Fe0/0] C2621 [Fe0/1] -> [Fe0/2] Modem [WAN] -> Internet PC1: 192.168.254.100/24 C2621: Fe0/0: 192.168.254.254/24 ...
3
votes
1answer
217 views

Consequences of an intra-switch Loopback cable

I am using Dell switch and I looped it to itself. If I enable STP on 2 ports, what happen the port states? I have attached the topology below. Let me know, if you need clarification.
-1
votes
1answer
761 views

Cisco 2950 - 3550 with a straight through cable

Everything I have read and experienced with both Cisco 2950 and 3550 switches seems to confirm the ports will not support Auto-MDIX. However yesterday when connecting a 3550 and 2950 I forgot to use a ...
6
votes
1answer
4k views

What is the correct way to determine SFP+ Direct Attach cable compatibility between switches and NICs?

I'm contemplating a 10 Gigabit link between an Intel x520 NIC and a Cisco SG500X switch. These two would be within 5m of one another, so using one of the Cisco SFP+ passive Direct Attach cables like ...
19
votes
5answers
97k views

Cable Colors and Purpose

I've been doing some work with some big businesses and so far I've learned yellow is internet and blue is phone. Is this a standard or is this just a personal chose? Do colors mean different tasks?
3
votes
5answers
24k views

Routing Serial cables instead of Ethernet

I am doing some CCNA training videos and using packet tracer and they showed using a serial cable to connect two routers. Why are serial cables used instead of Ethernet cables? Does it depend on the ...
4
votes
2answers
196 views

Connecting 2 FCoE Switches together with optical cable

I'm designing a network and have 2 cabinets on each floor, and I'm thinking of using FCoE switches in both cabinets so that I can connect them with fibreoptic cable. I think I can easily find switches ...
1
vote
5answers
213 views

Is it common for rackmountable servers to have fibroptic input and output? or is it cat 5 and you have to convert after?

If the switching hub is in the floor above the server, I've heard its best to use fibre-optic cabling to avoid interference from unrelated electrical cabling in the ceiling for lights etc... Is it ...
4
votes
5answers
6k views

How do the different types of materials used in Ethernet cables affect reliability?

There are many metals used in different types of network cables, such as aluminum and copper. Some are expensive and some are cheap. What scenarios constitute the use of these types of different wire ...

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