IES-1248-51/51A/53 User’s Guide
Chapter 4 MDF Connections 61
CHAPTER 4
MDF Connections
This chapter shows you how to connect the Telco-50 connectors to an MDF.
4.1 MDF Connections Overview
Observe the following before you start:
• See Appendix B on page 445 for the gauge of telephone wire to use.
• Follow the pin assignments shown in Appendix C on page 449 to wire Telco-50 cables to
Telco-50 connectors.
• See Chapter 1 on page 41 and Appendix C on page 449 for details on how to make the
management connections.
4.2 MDF (Main Distribution Frame)
An MDF is usually installed between subscribers’ equipment and the telephone company
(CO) in a basement or telephone room. The MDF is the point of termination for the outside
telephone company lines coming into a building and the telephone wiring in the building.
Figure 15 MDF (Main Distribution Frame) Wiring
• Connect wiring to end-user equipment to the lower ports of an MDF and connect wiring
from the telephone company to the upper ports of an MDF (see the previous figure).
• Some MDFs have surge protection circuitry built in between the two banks; thus, do not
connect telephone wires from the telephone company directly to your IES-1248.
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