1 pbx installation considerations basic telecommunications

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PBX installation considerations

BASIC TELECOMMUNICATIONS

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Certain considerations have to be taken into account when installing a PBX system:

Future expansion is very important when installing any kind of low voltage system.

As a company grows so too does the equipment and supporting hardware needs


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Setting up the back board to accommodate a PBX and auxiliary components


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FUTURE PROOFING


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Notice that none of the cable paths cross over each other, it is important to maintain a separate path for each cable trunk

This is also maintained in the cable tray which requires more planning so that the cable trunks flow off the ladder rack an route to their destination on the back board without crossing over any other cable trunk


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The PBX cabinet install, making room for the UPS, Voice mail module and paging amp.


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When mounting equipment and hardware (110 or 66 blocks) it is critical that you use a torpedo level.

Cross connecting pathways should never be shared with cable pathways on a backboard, two separate pathways should be established

Power cords should all be routed together and separated from all cables and cross-connects to eliminate potential EMI problems


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When mounting 66 blocks on a backboard maintain a spacing of approximately 2” or the width of 1 66 block when mounting side by side


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Most PBXs require the use of 25 pair amphenol connectors to extend the phone extensions onto a termination block, these can be either male or female type connectors.


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These 25 pair cables can be bought pre-made or can be made using an amp champ tool


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Here is an example of a 25 pair cable connected to an extension port using an amphenol connector


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In some cases a 25 pair cable may be needed for incoming CO lines, some PBX systems will have RJ-11 inputs or an amphenol input


This cable can be plugged into a RJ-21X or the amphenol can be cut off and terminated directly on a 66/110 block. The RJ-lls would then plug into the CO inputs on the PBX

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As a technician you will have to find the POTS lines at the D-Marc and push the dial tone over backbone cable to your closet

It is important to track pair counts and pair colors as you cross wire from closet to closet, block to block to get the dial tone to appear on your 66 block

This is why it is important to write down your pair numbers as you work your way to the final destination


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Starting at the MDF (Main Distribution Frame) or EF (Entrance Facility), from here we pick it up at the TR (Telecommunications Room)


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Here is an example of the different PBX boards using both amphenol and RJ type connections


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Different types of small business phone switches


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Older 1A2 key system installation, all features were hard wired with cross connect wires


1 pbx installation considerations basic telecommunications

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