Mitel Inter-Tel 5000, Installation And Maintenance Manual

Page: 143 / 468

Chapter 5: Installation
Mounting and Cabling the Main Distribution Frame (MDF)
Inter-Tel
®
5000 Installation Manual – Issue 2.4, May 2008
Page 5-21
•
If desired, two- or three-pair twisted cable and four- or six-conductor modular jacks [line
jack units] may be used for
all endpoint connections. This allows the various types of
endpoints to be easily interchanged as needed.
•
Install proper type cable for the application according to the National Electrical Code and
local building codes [BS 6701 in Europe].
•
Avoid cable runs parallel to fluorescent light fixtures or AC lines not in conduit. If these
obstacles are unavoidable, run the cables across them at right angles.
•
Do not run cables inside electrical conduit already occupied by AC power cable. To do so
is a violation of the National Electrical Code, or BS 6701.
•
Do not run cables near equipment with electric motors or through strong magnetic fields,
such as those generated by large copy machines, arc welding equipment, heavy motors,
etc.
•
Do not place station cables where they can be stepped on or where they can be rolled
over by office furniture.
•
Do not exceed the loop limit measurements for the endpoint cable lengths, using 24
gauge (AWG) wire.
For additional information about laying out cable runs for digital expansion installations, see
“Optional System Equipment” on
page 5-169 .
Mounting and Cabling the Main Distribution Frame (MDF)
The MDF is the point at which the station instruments, trunks, and auxiliary system equipment
are connected to terminal blocks [Krone blocks], or in the case of T1/PRI or E1/PRI trunks,
modular jack [line jack unit] assemblies are used instead. These terminal blocks [Krone blocks]
connect to the circuit modules in the Inter-Tel CS-5200/5400/5600 Base Server chassis.
Connections
must be made carefully and securely with solid copper wire. Do not use stranded,
or speaker, wire to connect endpoints to the system.
With a European system each module is normally supplied with 2-meter cable, but 4-meter
cables are available by special order. These cables are supplied with the appropriate number of
Krone blocks for the module type.
To simplify the MDF installation instructions, this manual outlines basic one block-to-one module
installation using bridging clips. However, it is quite acceptable, and in some situations more
functional, to use additional blocks, then cross connect between them.
To assemble the MDF:
1. Mount a 4 ft x 6 ft (1.2 m x 1.8 m), ¾-inch (2 cm) plywood backboard at the MDF
location. Depending on the number of stations and trunks to be installed, a larger
backboard may be necessary.
2. With a U.S. system, attach the 66M1-50-type terminal blocks to the plywood backboard.
With a European system, attach the Krone blocks to the plywood backboard. This
includes blocks for connecting CO trunks.
3. If installing any T1/PRI and/or E1/PRI trunks, attach 8-pin, 8-conductor modular jack
assemblies to the MDF as required. For information on installing T1/PRI or E1/PRI
trunks, see
page 5-29 .
NOTE
If three-pair cable is used with a U.S. system, extra terminal blocks and the
use of cross-connect wiring techniques are required.