Preparing The Main Distribution Frame - Comdial DX-80 Installation & Maintenance Manual

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Six conductor modular jack assemblies for all station instruments (recommended).
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Standard punch-down terminal block(s) (66M1-50 type) as required.
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Four or six conductor crimping modular plug assemblies for each port interface. Or, a better choice is to use
DX-80 PN "RJ11-4P" cables to extend DX-80 ports to the MDF.
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AC voltage surge/spike protector.
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Standard telephone hand tools and mounting hardware for the KSU(s), MDF backboard, punch-down terminal
block(s), modular jack assemblies for CO lines, etc.

Preparing the Main Distribution Frame

The Main Distribution Frame (MDF) is the point at which the KSU, terminal equipment, CO lines, and miscellaneous
equipment are connected to one another. It is extremely important that the connections be made carefully and
accurately.
Assembling the MDF
Follow these steps to assemble the MDF.
1. Mount a sufficiently sized 3/4-inch plywood backboard at the proper location for use as the MDF termination
and equipment mounting board.
2. Plan the layout of all required MDF components allowing for expansion. This may include: KSU1, KSU2,
66M1-50 termination blocks, cable fastening hardware, and miscellaneous third-party communications
equipment (paging equipment, etc.)
3. Locate the Telco provided CO/Centrex lines at the DEMARC (Demarcation) and extend them to the MDF
location.
4. Locate a suitable, known-good earth ground preferably within 10 feet of the MDF and route a #10AWG
grounding wiring from the point of grounding to the MDF for connection to the KSU.
5. Install all terminal device wiring (telephone cabling) and route to the MDF location for termination.
6. Mount all equipment and termination hardware as required to complete interconnection of terminal devices
and KSU modules.
KSU Components and Installation
The Key Service Units are shipped in their own protective master carton and contain the following
components:
KSU1
•
1 mounting template
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1 System Installation & Features Manual
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1 Quick Start-up Guide
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1 Programming Guide
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Standard 408M (Module) equipped with 8 digital extension ports, 4 CO Line ports, and 1 CO Line PFT
(Power Failure Transfer) port.
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Standard CPM (Central Processor Module)
•
Standard APM4 (Analog Port Module – 4 port)
KSU2
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1 mounting template
•
Standard Expansion Cabinet 408M (Module) equipped with 8 digital extension ports, 4 CO Line ports,
and 1 CO Line PFT (Power Failure Transfer) port.
Open the carton(s) and verify that all items are complete and undamaged. Remove all packing material and
store for future use in the event that return shipment is required.
P7290 IMM
DX-80 I M
NSTALLATION AND AINTENANCE
2-3
M
ANUAL