ZyXEL Communications IES-1248-51A - MDF (Main Distribution Frame); Telco-50 Cables

Chapter 4 MDF Connections
IES-1248-51V User’s Guide
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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 16 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-1248-51V.
• Use a punch-down tool to seat telephone lines into MDF blocks.
• Multiple upper and lower MDF port connections are shown as one line in the
following figures.
4.3 Telco-50 Cables
Telco-50 cables are used for data and voice applications with MDFs (Main
Distribution Frame), patch panels and distribution boxes. They can also be used as
extension cables. Telco-50 cables are made up of 25 twisted-pair copper wires.
Connect a Telco-50 connector to one end of the cable (see Chapter 71 on page
579 for pin assignments) and connect the other end directly to an MDF;