Preparing The Main Distribution Frame; Assembling The Mdf; Ksu Components And Installation - Comdial DX-80 Technical Manual

Installing the DX-80

2.4 Preparing the Main Distribution Frame

The MDF is the point at which the KSU, terminal equipment, CO lines, and miscellaneous equipment
connect to one another. It is extremely important that you make the connections carefully and accu-
rately.

2.4.1 ASSEMBLING THE MDF

Follow these steps to assemble the MDF.
1. Mount a sufficiently sized, 3/4-inch plywood backboard at the proper location to 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 telephone cabling and route to the MDF location for termination.
6. Mount all equipment and termination hardware as required to interconnect terminal devices and
KSU modules.

2.4.2 KSU COMPONENTS AND INSTALLATION

The KSUs are shipped in their own protective master carton and contain the following components:
KSU1
• one mounting template
• standard 408M (module) equipped with eight digital extension ports, four CO line ports, and one
CO line PFT (Power Failure Transfer) port
• standard CPM
• standard APM4
• system installation, maintenance, and programming manuals and system installation quick
reference guide.
KSU2
• one mounting template
• standard expansion cabinet 408E (module) equipped with 8 digital extension ports, four CO line
ports, and one CO line PFT port.
Open the cartons 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.
42 Comdial October, '03