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Technical Information....

The following is some technical information that may aid you in the process of writing a telecommunication specification, scope of work, etc.  We have included some BICSI and TIA/IEEE industry standards.

CABLING SYSTEM GENERAL SPECIFICATIONS

The system provided shall be a universal cabling plant that will work with any UTP network set up in the star configuration. There will be two types of UTP used in this design; one is category 5 for data and the other is category 3 for voice. All components and cable for both systems will be furnished by (name preferred manufacturer) with all of the components and wiring matching to insure category 3 and category 5 compliance from the source through the wallplate. All data connections will be terminated in the RJ45 configuration. The wiring sequence for all data jacks shall be 568B (standard) or 568A (some people prefer).

This system shall be installed by a certified category 5 installer. The installation shall conform to the "Current Building Wiring Standard" represented as EIA/TIA-568 and shall meet all specifications set forth in those standards for performance and characterization. This specification also governs work practices and procedures which will be followed; it should be especially noted that all cables will be installed high in the bay avoiding all electrical conduit, motors, lights, and other possible sources of interference.

All patching shall be installed using the latest certified techniques and shall contain no patch panels with over 48 ports.  Each patch panel shall have one two position ring run above it with the appropriate ring runs on each side. All patching shall have strain relief mounted to the rear with cables mounted appropriately.

All fiber shall be manufactured by the XXX (customer specification) Corp. The backbone or vertical riser that runs from the computer room from Main Distribution Frame to the Intermediate Distribution Frame on the xxx floor shall be Multimode "Premise Distribution Cable" and is FDDI grade. It is the typical 62.5/125 micron used in most applications and is assembled in a tight/loose buffer configuration.

SCOPE OF WORK FOR GENERAL AREA

CABLE RUNS

Furnish and install (# of cables) category 5, 4 pair plenum cables run from the Main Distribution Frame to (number of)  wallplate locations as per layout provided. All boxes will be set into the walls. Any block/brick exposed areas will have the cables housed in surface raceway (indicate manufacturer preference).

WALLPLATES

Each standard office wallplate will contain two category 5 data jacks (RJ45), with 2 category 3 voice jacks. Note the second data jack can be used for a printer, fax, copier, or an ISDN line. The first voice jack is for the phone system with the second jack for auxiliary connection such as modem, desktop faxing, or internet connection.

PATCHING-(MAIN DISTRIBUTION FRAME)

It should be noted here that one of the biggest problems encountered with a patching system is: manageability after the installation. The design we are presenting requires more space and wire management components but will provide much better system manageability. The frame will be set up so that the patch panel will be limited to 48 ports and will have a double spaced ring run installed above and below it as well as vertical ring runs on each side of it. In practice this allows all of the ports to be visible, after patching, as well as providing good path to the port for patch cords. All patching will also have rear strain relief mounted to it for stabilized connection. The frame will also have the ability to contain any system hardware deemed necessary.

TESTING

All lines to be tested with a continuity tester and all category 5 cables and components with a category five tester (Wavetek-Lantek Pro XL) to insure quality of installation and provide the customer with a hard copy of each line’s performance. Each line shall be tested for wiring faults, length, attenuation, capacitance, noise, and near end cross talk (NEXT). All lines shall meet or exceed cat five standards.

DOCUMENTATION

We will label all wallplates, cables, and the patch panels with an easily identifiable system, this will facilitate all adds, moves, and changes. We will also furnish a drawing showing the location of all wallplates and the system patching.

SCOPE OF WORK FOR THE FIBER BACKBONE

FIBER RUN

The fiber will be one 12 strand fiber optic cable (type) and will be run from the Main Distribution Frame in the computer room to the Sub Distribution Frame in a remote location.

TERMINATION EQUIPMENT

The termination equipment will consist of one FMS (Fiber Management System) panel cabinet (rack mountable), and one fiber optic 24 port patch panel in each cabinet at both ends of the run.

TERMINATIONS

All 24 terminations will be made with (add preferred termination method here) and shall be in the (ST or SC) configuration.

TESTING

Each strand of fiber will be tested both at 850 and 1300’s nm’s, the test shall be done in accordance with EIA/TIA 568A. This calculation works out to be no more than a .5 decibel loss for the ~400’run. The spec for each mated pair of connections is a maximum of .75 db. Results of the tests will be provided.

FIBER RUNS

Furnish and install one dual strand optical fiber from the data distribution cabinet on the floor to each of the 46 wallplates previously described. The fiber will not be terminated on either end but will be coiled in the distribution cabinet at one end and in each wallplate at the other end. See general specification section for fiber information, also see the attachment showing the manufacturer’s specifications.

 

 

Netcomm Systems, Inc.,  54 Loomis Street, Bedford, MA   01730
Tel:  (781) 275-3093 - Fax: (781) 271-0933
E:Mail:  netcomm@netcommsys.com

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