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2
votes
3answers
56 views

Long cat5e cable

Cabling contractors put wires according to plan however I think the distance is longer than 100 meters as I cannot see devices connected on another end. When the cat5e cable is longer than 100 meters, ...
0
votes
2answers
83 views

Odd Network Cable Color Coding Sequence

I just got hired into a new company where no IT has been before. My first task was to identify the possible problems. This is what I first saw, when checking on the cables connected to the switch, I ...
1
vote
1answer
49 views

Infiniband cable

What is the difference between an active and a passive cable? What is the difference between QSFP and QSFP+? Given the choice between copper and fiber, for a very short distance like 3 feet max, is ...
2
votes
1answer
94 views

Send network signal over a very long distance of copper

I have an issue were I need to interconnect 2 switches together. We've estimated that they are 1400 meters away (cabling distance). I wanted to use a media converter to extend the signal on OS1 ...
2
votes
1answer
197 views

Cabling for SAS drives in a Dell T420 with Perc H710

After having purchased a Dell T420 with SATA drives and without RAID, and discovering this was a mistake for performance reasons, I'm obtaining a Perc H710 PCI card and SAS drives. Now I'm stuck with ...
14
votes
2answers
1k views

Tracing a network cable that is already connected to the network

Some remodeling was done while I was away from work, and I'm left with several unlabeled cat5 cables that are terminated with RJ45 keystone modules. On the other end, all of the cables are terminated ...
4
votes
2answers
104 views

Find a UTP cable in a live network

Is there a way to find a UTP cable in a live network, without damaging the network? The problem is we have some cables laying in the server-room from god knows where. I want to find the other end of ...
0
votes
0answers
45 views

issue with QSFP+ to 4x SFP+ cable

I have a Gigabyte MD60-SC0 motherboard which has a QSFP+ port. I need to connect this with another machine I have which has a Intel X520-SR2 NIC (with two SFP+ ports) plugged in. I also have QSFP+ to ...
1
vote
0answers
35 views

USB having periodic connection issues over <15 foot cable run - EMI or?

I hope this is an appropriate topic for this stack exchange. I have a cable run just shy of 15 feet that connects a few monitors (3) and usb 3.0 devices (a USB 3.0 hub) to one of the servers on the ...
3
votes
1answer
71 views

SFF-8087 cable and connector variations causing fault?

I recently bought a set of 6 cables to connect my LSI MegaRAID card to my Norco-4224 backplane. The connector on both ends is SFF-8087. However, when they arrived, the disks would not be detected. ...
-6
votes
1answer
192 views

Why is RJ45 DB9 console cable still used, when all the latest computer do not have serial port? [closed]

I still see quite often that RJ45 DB9 console cable is attached with some devices, when I do not even have a computer with old serial port. So I need to either get the USB - DB9 adapter or USB - ...
-1
votes
2answers
129 views

Mini-SAS Connector Issue

allow me to apologize in advance, because I am horribly uneducated in this realm, yet I find myself with this problem: My company hired ProMax to setup all of our networking in our office. One of the ...
-1
votes
1answer
111 views

What is the most proper way of wiring RJ45 for Cat6/LAN?

I currently know of three different wiring patterns for RJ45: T568A, T568B, and USOC. Simply put: Which is the best method for creating a Cat6 cable? From my research, it seems like I should use ...
-3
votes
1answer
73 views

Splitting Ethernet cable [closed]

I am looking for the best way to network my small business. I have an office where my router/modem are located, and then 2 more computers in another room. I can route Ethernet to this room with about ...
6
votes
1answer
612 views

Is it possible to detect rx+ rx- tx+ tx- wires with multimeter?

Is it possible to detect rx+ rx- tx+ tx- wires of an ethernet cable having only a part of cable with multimeter or somehow else? I mean the situation when you have just one side of the ethernet ...
3
votes
1answer
441 views

Do Netgear switches accept other brands of SFP+ modules and cables (e. g. Cisco)?

Specifically, I'm looking to connect servers with Intel X520-DA1 10 Gigabit Ethernet cards to the 10Gbe ports of a Netgear ProSafe GS752TXS. Can I use Cisco SFP+ cables (SFP-H10GB-CU5M) and optical ...
1
vote
1answer
239 views

Using Stranded vs. Solid CAT5 in a cable tray

I'm going to be installing a switch and 40 workstations/printers in a building. All the rooms have raised floors with cable trays running in various grids and there are cable trays going between the ...
0
votes
1answer
434 views

PVC raceway/conduit for CAT5e/CAT6/CAT6A cable

This is probably a bunch of stupid questions . The scenario is of running a few (5-6) CAT cables (version undecided, depending on costs). The scenario would be something like this :- a 3G USB modem ...
0
votes
0answers
87 views

What's a 25 core network cable

While looking for different types of network cable, I came across this term called 25-core cable. You can get numerous examples putting the term '25-core cable' in any search-engine. But till date ...
2
votes
1answer
949 views

Is crossover cable still needed? [closed]

Do I still need a crossover cable to connect two PC's directly? (NIC <-> NIC)? If not, then why was this needed in the past, and when was it used for this? Specifically, when did crossover cables ...
0
votes
2answers
122 views

Can I use a 10G optical cable for 1G communications?

On Amazon, I see MMF optical cables advertised for 10Gbe. (See example here.) I'm looking for a 50u MMF optical cable for 1Gbe. Will the 10Gbe cables also work for 1Gbe? (The cable would be used ...
1
vote
1answer
4k views

Chosing the right CAT6 cable type (STP FTP UTP)

I'm doing a network rewiring project, and I'm planning on using CAT6 cable for the wiring, but I have the choice between STP, FTP or UTP cable. Some of those cables, if not most, will run close to ...
9
votes
1answer
939 views

Proper method for connecting multiple non-stackable network switches?

I deal with many clients in warehousing and industrial applications who have IT staff or local consultants. Many of these sites are still using a 10/100 Megabit switching backbone... I've managed to ...
3
votes
1answer
2k views

What will happen if a PoE powered patch cable is plugged into a normal RJ-45 plug?

I have a couple PoE powered keystone jacks sticking out of a wall in a computer lab. We're going to remove /block the excess ones eventually, but for now I'm worried about somebody plugging a laptop ...
1
vote
2answers
93 views

UltraSPARC Serial Port and Required Cable

I have two large SPARC machines and no monitor cable that plugs into them. So I'm trying to get a serial connection to them through null modem cables. However, there doesn't appear to be such ports on ...
2
votes
2answers
360 views

Identifying a CAT6 cable in a bundle

We had a contractor wire up our office with all the cables leading back to a central location. The only problem is that he didn't label anything, so we have no idea which cables go to which room. One ...
0
votes
1answer
574 views

NVIDIA Tesla K20C in Dell PowerEdge R720xd — power cables

I am trying to put an NVIDIA Tesla K20C into a Dell PowerEdge R720xd. I'm having a bit of trouble understanding the power requirements of the card. First, here is a picture of two pages of the ...
1
vote
2answers
446 views

SAN newbie: What kind of fiber cables do I need to connect to the front end ports on my EMC CX300

I have an old CX300 I'm messing with and I cant determine what kind of HBA\fiber cables I need to connect a server to the front end ports on the DPE2. The hardware reference doesn't give me any ...
4
votes
1answer
77 views

Category 4 Cabling in my Cisco Network

I have discovered slow performance in various portion of my network accessing network drives and server side applications. When I logged into the switch providing access for these users I ran a show ...
2
votes
2answers
469 views

What cable do I require for SFF-8087 to SAS

I have a HP P410 and two 2.5" SAS Drives, i want to connect both those SAS drives to one port. I know the cable for the P410 is a SFF-8087 and ive seen plenty of adapters searching, but alot of them ...
6
votes
3answers
3k views

Is APC's smart-signaling cable (940-0024) really proprietary?

First, not sure if this question belongs here or SU, so please advice accordingly before wildly down-voting or blasting me. We have a UPS unit for which we recently configured to work on our network. ...
1
vote
3answers
135 views

Robust RJ45 for frequent connections/disconnections [closed]

I am looking for robust RJ45 cables/connectors in an environment where people come and go and plug in and out. After a month of usage, the connectors are worn out and fall out and you need to replace ...
1
vote
1answer
79 views

BT socket Device over Structured Cabling

Not sure if this is the right stack* site to post on but I believe cabling is a just subject. Essentially I have a Credit Card machine which is connected to a phone line via standard BT Socket. So ...
9
votes
2answers
748 views

Are SATA 1, 2 and 3 cables interchangeable?

I've got an older SATA drive (not sure if it's SATA 1 or 2). Same size plug as my new SATA 3 M/B. Are the cables interchangeable? Any decrease in performance from using a "lower" cable?
17
votes
3answers
3k views

Connecting two desktop switches with more than one cable?

I was hoping to find a way to increase bandwidth between two desktop switches I have, and I wondered if connecting them with two cables (or perhaps three) instead of just one might increase ...
4
votes
3answers
1k views

Effect of reversing a pair, in cat5 cabling (e.g. swapping stripe and solid)

Is there any practical effect of reversing solid and stripe, when wiring cat5 cables? But if I've got a cable where each pair is a pair but one end is flipped, will this make any practical difference ...
1
vote
5answers
6k views

New office cabling: should we use CAT7 or CAT6a? [closed]

We are going to do the cabling in our new office building and we are thinking to lay down 10Gbit cables since we use HP switches that come with 10Gbit ethernet ports. We will also lay down few fiber ...
2
votes
0answers
107 views

Any tricks for checking if a ethernet cable is in use? [closed]

Faced with bundles of white cat5 in the attic, any suggestions for non-intrusive checks to determine which ones are in use? Thanks, Kent
2
votes
3answers
2k views

What am I doing wrong with this cat 6 patch panel wiring?

top number is transmitter bottom number is remote terminator 12345678 36145278 is this because I could be mixing T568A and T568B wiring? how do I know if my patch cord is A or B? Do I just look at ...
6
votes
1answer
409 views

Why do metal fasteners (e.g., staples) around ethernet cables impair network performance? [closed]

At one point I was living in a 6 bedroom home that had cat 6 ethernet wired to each bedroom. The internet connection to the bedrooms furthest from the cable modem had terrible performance, though I ...
8
votes
1answer
2k views

Server room wiring questions

I'm looking at rewiring our server room to be more presentable, organized, and easier to troubleshooting. Right now we currently have 4 HP racks (don't know the model right now). We do not have a ...
3
votes
1answer
1k views

SFP+ vs CAT6a for 10GbE

We are looking to implement 10Gig ethernet for our ESX hosts and SANs. There are a number of solutions we have been looking at and it has really boiled down to what will give us the best bandwidth. ...
2
votes
1answer
197 views

How do I find out which pairs of a CAT5e cable are actually connected to another machine?

Using Linux (Debian, to be specific) on a laptop, I want to be able to check whether, for example, the TX or RX pairs are both connected to another machine. If, say, I've only connected RX (and am ...
5
votes
7answers
547 views

What is a DB 9 to 3.5mm quad plug cable used for?

While cleaning up the office today we ran across two odd looking cables still in bags. On one end is a female DB 9 connector and the other end is a 3.5mm plug with 4 contact points. The types of ...
1
vote
2answers
205 views

How to introduce and detect errors in Twisted Pair cables [closed]

I am taught that Twisted Pair cables are twisted to cancel interference. Now, I have a CAT-5e crossed over cable of approximately 2 M in length. I removed the cable's cover and untwisted the wires. ...
4
votes
3answers
3k views

Sanity Check: Is my CAT5e cable probably bad, or do I just need different connectors?

I'm working with a small company, and since I'm the only one with even a half-ounce of network infrastructure experience I've got the job of wiring up our network. So please forgive my newbie-ness. ...
1
vote
1answer
79 views

shielded cat 6 cable

I am installing shielded cat6 cable for a building and i noticed that the green and blue pairs in the cable are thicker than the orange and brown pairs. I tried to install a cat6 rj45 but the pairs ...
2
votes
2answers
1k views

Powervault MD circular console cable

We have two Powervault MD SAS devices, the specific model eludes me as these are remote and not accessible to me and anyone on-site doesn't have the capability to locate a service tag/serial or model ...
-1
votes
2answers
195 views

Why are serial console ports on network switches 8P8C/RJ45 sockets? [closed]

It has always seemed a bit strange to me that the console ports on networking gear are 8P8C (popularly referred to as "RJ45" even though that's not strictly applicable here) connectors and require an ...
-2
votes
1answer
82 views

Network Cable and Rainy Weather [closed]

How does rain and water effect on network cable such as cat5?