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Network Cabling Issues

4 Jan 2013

Cat5 ,Cat6 ,lan cable Given that labor costs for installation are much higher than the material cost for cable; your first requirement is to use the highest grade cable available. Cat5e is the most common, but Cat6 is becoming the standard as it is rated for a higher frequency signal, a somewhat higher cable quality, and has tighter specifications for noise and crosstalk. Both Cat5e and Cat6 can handle gigabit speeds.

Both Cat5e and Cat6 use 10BaseT “twisted-pair” cabling, because it is ideal for either small, medium, or large networks that need flexibility and the capacity to expand as the number of network users grow. In a twisted-pair network, each PC has a twisted-pair cable that runs to a centralized hub. Twisted-pair is generally more reliable than thin coax networks because the hub is capable of correcting data errors and improving the network's overall transmission speed and reliability. Also known as “up linking” hubs, they can be chained together for even greater expansion.

Should you install the cabling yourself, or hire a contractor? The smaller the office network, the more tempting it is to install cabling in-house. While this will save installation costs, it is important to be sure that all the cabling is installed and tested to professional standards. If your network encompasses multiple rooms-and/or floors, then hiring a professional cable installer that has experience with data communications networks is the safest and most practical route. General electricians may not be familiar with all the requirements. Experienced cable installers such as Progressive Cabling will know the right grades of cables and connectors and have the knowledge and equipment to install and test a cabling system.

The Good, the Bad, and the Ugly: Cabling Lessons Learned

14 Dec 2012

Stu Kushner

A magnetic field when running low voltages. Unfortunately, when this unshielded cabling creates a magnetic field created. Any electrical cabling bear by disrupts communication, slowing transmission or preventing Network cabling is a tricky. Even with a solid background, technicians without adequate knowledge and training can make mistakes that may shut down an entire system. Here are some typical mistakes seen in network cabling.

Plan for the Future. Cat5 may be the cheaper option, but can cause problems when upgrading is needed. Install Cat5e or Cat6 cables with options for upgrades to save labor costs.

Don’t Mix and Match. Twisted pair cabling was often out of the price range for many companies, so priority was given to data, while voice had with cheaper cabling. Now, VoIP has made voice equal to data in importance and need. Fortunately, a typical VoIP phone has a built-in Ethernet connection or pass-thru that is compatible with almost any data cable, which decreases installation costs.

Don't put Electrical Cables Next to Data Cables. Data cables use twisted pairs of wires inside that help produce transmissions altogether. This generally happens when the cables are running parallel, so if your cable is near a power line, lay them perpendicular to the power line.

Not Laying New Cable When You Need To. Ethernet switches are convenient, but can be misused. Mini-switches are often added to provide a few extra ports; but this can cause bottlenecks and instability. Add extra cable instead, if more network resources are needed.

Forgetting Cable Management. “Ladder racks” add extra cost to an installation, but they also make the installation look better, run better, and easier to maintain and update. Also, don't forget to color code or label your cables, so technicians can actually find the right cable later.

Pulling cable through a basket tray via remote control tank

30 Aug 2012

Stu Kushner

This video demonstrates how we used a remote control tank named Brutus to pull cable through a basket tray that is installed above the ceiling tiles in an office. For large cabling projects it is typically useful and necessary to install a ladder tray above the ceiling tiles to carry the large bundles of cables along the corridors of a floor. At this project, the General Contractor installed basket tray. Basket tray does not provide for easy access underneath which made it especially difficult to pull the cable along. Even getting a pull string through this tray was challenging. So, we bought a remote control tank. We named him Brutus. And we attached the pull string to his back and had him drive the string along the entire length of the tray.

Go Brutus!

US Court of Appeals Veterans Affairs – Cabling Project Notes

18 Jun 2012

Stu Kushner

Project Objectives (Do not call, this project has been COMPLETED)

Number of Drops: 360 (140 duals, and 20 quads)

Ceiling: Non-plenum, separate ducting

Racks: Enclosed, 19”, will already be installed by customer

Switches: Provided by customer, 48 port

Patch cables: None necessary. They will provide patch cables from wall plate to computers and from patch panels to switches.

Labeling and documentation of all cabling is important. How this looks is important to them. Please provide a spreadsheet of all wallplates and rooms.

Location is behind elevators.

All workstation runs will terminate in wiring closet behind elevators.

We will mount patch panels in this closet on the wall. Use 24port, Cat5e, patch panels.

They will mount racks for switches.

4 pairs of fiber will run from the closet to the server room on the same floor. We are to provide the cabling plant for the fiber.

Server Room:

2, 24 port patch panels per rack.

Cabling plant for fiber to switch closet.

Existing server room

They want cable management hardware to be part of the solution. What you see in this room is what they’re cleaning up and looking to make high end and professional in the new location. Photos here include existing fiber. Note the ceiling cable management rack. In the new location these will be in place in the server room and along the ceiling in the main hallways.

New server space - Roughed in area they’re moving to.

General Floor Space:

Quad drops in each office and cube in the technology area

Dual drops in all other offices

6 drops for cable t.v.

Wall facing outside is already dry walled and insulated

Part of that wall has large window with wall space under it. Customer is unsure if drops will go there or anywhere along that outside wall.

Includes the outside wall. They’re not sure if there will be drops along this wall. If so it’ll be interesting because of the insulation. Also note that they MAY want drops under the windows along this wall.

There are some pictures of the ceiling details. Also note that the client will already have cabling runners ceiling mounted down the middle of the two main hallways to the server room.

Special Fiber Optic Line Item Bid:

US Court of Appeals wants this as a line item so they can choose to add this work or not when they’re doing the budget.

Fiber runs between floors. The floor plan represents the 6th floor. 14 runs broken out as follows. A single 6-strand fiber cable will be run from the 6th to each floor in the table below. Three strands will be connected and three will be left as spares.

# of Runs	Floor
3	11th
3	10th
3	9th
3	2nd
2	Mezzanine

12’ ceilings, concrete floors.

Conduit already exists between the floors. We have to repack the conduit we use with fire stop putty to meet fire code. See photos of the “Switch closet” for conduit images.

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