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Questions tagged [cable]

The questions tagged that way are for the physical aspect of the cable, like length limitation, physical properties, tubing, installation, etc..

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3
votes
2answers
300 views

stp vs utp whats the exact reason for using stp

the wiki article says that twisting the wires protects them from external electromagnetic interference. But then why would you need to go for shielded twisted pair wiring ? Anyway the twist in the ...
3
votes
3answers
458 views

T1 versus Cable Modem

We've been using T1's for years and never changed the connection to a faster Cable Modem. I am concerned about support, return to service. I cannot find in legalese Cable vs T1's FCC Regulations SLA'...
0
votes
2answers
1k views

is it possible to direct connect a client and server with 10GBASE CX4 copper cables?

Server has two 10GBASE-CX4 ports. client has 10GBASE CX4 HBA. can theybe directly connected with a CX4 cable without the need for a switch? like SAS Infiband connectors?
1
vote
1answer
222 views

hybrid cable for QSFP to CX4 convertion

here is a hybrid cable for QSFP to CX4. Will this fit SFP+ ports? Deeply confused by standards and struck in a situation with wrong hardware selection!Personally have not seen the ports/hardware and ...
5
votes
2answers
7k views

please demystify the 10Gb ethernet interfaces, cables

this really is a Dell question but tempted to ask the experts @ serverfault. choosen a Dell powerconnect 8024 10GbE switch. per the spec sheet this has 10GbaseT ports. "24x 10GBASE-T (10Gb/1Gb/100Mb)...
7
votes
3answers
5k views

How to correctly run cables on servers in a data center?

I've read about a few key points, e.g. run all ethernet cables on the right side, all power on the left side, but if possible I'd like to know what you guys do from experience? For example, how do you ...
3
votes
3answers
250 views

Link mode on unmanaged gigabit switches

I have two RJ45 sockets connected by an inaccessible unknown-category twisted pair cable. I plug two unmanaged gigabit switches into the sockets using Cat6 cables, and they negotiate a 100Mbps link. I ...
1
vote
1answer
620 views

i2c cable for 3ware 9650se and SuperChassis 846A-R1200B

What's the appropriate cable to support i2c (red LED drive indicator, failure) with this combination and what's the best way to order it? I see 3ware supports 846TQ but not 846A from http://kb.lsi.com/...
6
votes
3answers
4k views

Best cat6 patch panels? Is price really a factor?

I can go down to my local graybar right now and purchase some AllenTel 48 Port Cat 6 Patch panels I need (part number AT66-PNL-48). They are $275 each. That seems a bit high considering I've seen ...
0
votes
1answer
507 views

How to build a Software-Network-Tester?

The company where I work is building special twisted pair network cables. Those cables need to be tested for function and performance (100/1000 Base-T). Since we only produce small batches of those ...
0
votes
5answers
1k views

Flat 8-conductor cables for a serial console. What are they called?

I'm looking for a specific kind of Ethernet 8-conductor data cable. I am having trouble finding them online (at CDW, Newegg) because I can't always come up with the right search terms. A search for "...
2
votes
3answers
233 views

Dedicated Pipe or Cable Provider

Right now I'm in a position to go with a dedicated 5up/5down pipe from our ISP or go with Time Warner Cable for a 50up/5down connection. Can somebody shine some light into what other things I should ...
1
vote
5answers
5k views

NIC status stays at 'Network Cable Unplugged' although cable is present

I'm having a problem with a couple 10GB NICs, one in particular in Windows 7 x64 that always thinks the cable is missing. The drivers for the NIC are current, downloaded from Intel- it's settings are ...
3
votes
5answers
1k views

Groupings for Network Cable Colors

I noticed a thread Network cable color conventions? that talked about what types of colors to use for cabling in server rooms and closets. I thought that if there was a general consensus as to the ...
12
votes
15answers
2k views

Network cables - make them or buy them

First of all, I must say I've never had a problems with making cables by myself, last years stopped using cable testers just because they always say the cable I've made is ok. But I see there's a lot ...
0
votes
3answers
212 views

When I plug in a network patch cable to a test notebook what would cause it to not see the link?

I plugged in my notebook via cat5e patch cable to a terminated jack (we had some consultants do the runs), I get no signal not even an indication that it is connected but has no DHCP. I try another ...
1
vote
2answers
3k views

Trouble with SFP cables for a 10 Gb connection

I have two machines, each with a 10 Gb adapter, directly connected with an SFP cable. I purchased three SFP cables that look exactly alike (physically and specs), but only one works. I'm having ...
2
votes
3answers
284 views

The best cable organizing solution for the servers on the rails? [closed]

I'm looking for the best cable organizing solution for the servers installed on the rails inside a rack as well as for the equipment on the rollout carts. I believe there should be some foldable ...
1
vote
3answers
29k views

UTP cable maximum length

When I connect ten computers over a 100 meters (328ft) UTP Cat5, is the signal loss so large that it will affect my network performance? These computers perform simple office tasks, and the 100m utp ...
11
votes
7answers
2k views

Why straight-through ethernet cables?

I was explaining the difference between straight and crossover cables to my friend, and began wondering why on earth the early designers thought it was a good idea to use two different cable types? ...
3
votes
3answers
23k views

Network wiring template for Visio

Anyone come across a good template/symbol pack for Visio for doing network wiring, patching, switch topologies, etc.? Everything in Visio for networking is 3D, and isn't really conducive to cabling.
2
votes
1answer
195 views

Roughly cutting Fibre Cables

I recently asked a question about which type of Fibre optic cable to use for my installation. We have now found a cable type and supplier and I'm about to order the cable (OM3, Tight Buffered, 12 Core)...
8
votes
6answers
4k views

Effecient organization of spare cables and hardware

As many of you also likely do, I have a growing collection of cables, hardware, and spare parts (screws, connectors, etc.). I'm looking to find a good system of organization so that everything isn't a ...
1
vote
2answers
4k views

Using pre-made patch cables on a punch down block?

I need to add a 24 port switch to my wiring closet. In the (distant) past, I usually just punched each port of the switch to a 110 block on the wall (using hand-made cables), and cross connect ...
37
votes
2answers
13k views

Why do cat5 cables sometimes have the fluffy fiber bit in them?

Why do cat5 cables sometimes have the fluffy fiber bit in them?
4
votes
5answers
5k views

Creating a Network link between 2 buildings

My company needs to create a network link between two buildings. Currently we have a cat5e network in one building and would like to connect some computers(about 15) in our second building to the ...
4
votes
6answers
485 views

Cabling: What to keep in stock?

I have worked a few different places, each one with a different solution, so I would like to hear your suggestions and ideas. I am looking at a situation with multiple server-rooms. We have a mixture ...
4
votes
1answer
400 views

Fibre Optic Cabling - Where to start?

I'm a sysadmin/developer that works for a small IT company. We are having a new office building built, and we have a limited time window in which to put in the core infrastructure network cabling that ...
4
votes
2answers
209 views

Resources concerning cabling and wiring

I have some rudimentary knowledge of cabling and wiring but I would like to expand my knowledge. Currently, if we need any rewiring done for our PBX system we call in contractors which is expensive. I'...
6
votes
4answers
285 views

What's better for performance: rack-to-endpoint or rack-to-switch-to-endpoint

When putting Ethernet cables for an office there are two ways to put the cables: From the rack patch panel a cable to each end-point (workstation). From the rack patch panel a cable to each room/...
5
votes
1answer
512 views

Planning to buy some cat5e cables. 568A or 568b?

I plan to buy about 20-30 feet of Cat5e (or 6) cables. I have 30 mbits connection. I was looking around and the ones we are considering are 568B. I was looking for quality in my cables. Is this ...
3
votes
1answer
922 views

MRJ-21 Patch Panel System

I was reading about the MRJ-41 Patch Panel system here, but not sure I entirely understand it. It looks like it allows me to wire my own patch panels because it it uses a special cable to attach the ...
32
votes
5answers
24k views

What is the actual difference between Cat-5 and Cat-5e?

From the title, this sounds a whole lot like a repeat of this question, but it isn't, I promise. Because he wanted to know whether you could tell from looking at a cable whether it was Cat-5 or Cat-5e,...
5
votes
3answers
896 views

Cable guides for CAT 5e in the rafters?

I've got to pull six or so lines through the rafters of this building. There's a mess of wire up there, and I'd like to keep these lines separated a bit. Are there any cable guides that could be ...
30
votes
10answers
26k views

Network cable color conventions? [closed]

Are there any color conventions for network cable? I'm talking jacket color here, not the color of the individual conductors. I've seen and used mostly grey and blue which is what's usually readily ...
-2
votes
2answers
16k views

Cable type for connecting two routers

What kind of cable shuold I use to connect two routers, straight or crossover?
-1
votes
5answers
146 views

Buying cables and small electronics component offshore [closed]

I am wondering whether anybody have experience with buying cables and small electronics off shore. The site I have in mind is alibaba.com. It is similar to ebay and the quotes I'm getting seem to be ...
6
votes
2answers
3k views

What causes network cable to not work?

I've installed a bunch of cat-5 and when I check it for continuity and polarity it seems fine, but when I hook up a pair of laptops with a x-over cord and try to ping between them, they can detect ...
10
votes
9answers
32k views

Physical difference between Cat 5 and Cat 5e cabling?

(This isn't really server-related, but it seems more appropriate here than SO or SU.) When we had this house built, we had network cabling run inside the house, or so I'm lead to believe. It's ...
22
votes
11answers
179k views

Is there a difference between RJ-45 plugs for Cat-5e and Cat-6?

While looking around for some plugs to use for running and crimping some bulk Cat-6 cable, I noticed the online sites show RJ-45 plugs for Cat-5e and separate ones for Cat-6. Is there actually any ...
13
votes
3answers
16k views

What is the difference between pvc and plenum cabling?

I'm looking into buying a few rolls of bulk Cat6 cable to wire up a few cubicles to a test rack we have. One of the choices is PVC cable versus Plenum cable. What is the difference? Will this make ...
7
votes
6answers
1k views

Securing power cables

It's always annoyed me that while the sockets for network, serial, parallel and display cables all have securing mechanisms (ie a screw-in bolt, or a clasp) to stop them from being pulled out by ...
5
votes
8answers
2k views

What do I need to know when burying some wire?

We just purchased a building that is right next to our current building with a small gravel "road" in between (that we own). I'm looking to run some wire in a conduit underground to the other building....
1
vote
3answers
2k views

Multiple VLAN sharing over dummy switches

I already have a network for 4 kind of purpose (Local Network, VoIP, Accounting Depart, Sales Depart). All of them on same network (192.168.2.0/24) I'm planning to separate these networks and i have ...
8
votes
5answers
15k views

What's a reliable way to test patch panel connections?

I just had to run a total of 12 cat5 cables into a patch panel. This was the first time I'd actually done that. I'm reasonably confident that I got all the wires in the right order after some initial ...
5
votes
2answers
967 views

Network cabling Tips

I'm looking for some useful information about how to design network cabling for a building. I'm not so much interested in wiring standards such as 568A, but more interested in physically wiring the ...
2
votes
4answers
11k views

Fiber Optic Cable not working

Basically I am having a problem with a fiber optic cable connecting 2 switches not working, hired a professional to help fix it and in the end it is still not working. I need someone to look over ...
2
votes
5answers
637 views

Where to purchase quality network cable? [closed]

I'm interested to know where other folks buy networking cable in bulk. Many of the places I've found appear somewhat "iffy", and I'd like to buy from a reputable outfit that will be around the next ...
37
votes
14answers
101k views

What is a patch panel?

What is a patch panel? How it is different from (layer 2) switch? EDIT: I think my primary question (and confusion) is this: Why don't network connections go straight to the switch? Don't we still ...
4
votes
6answers
3k views

5v AC Adapter with multiple outputs?

In a couple of areas we have multiple devices that all run on 5v and have multiple adapters with standard jacks, which annoyingly require multiple sockets and cables. Does anything like an adapter ...