NEC Electra Elite 192, Hardware Manual

Page: 107 / 369

Electra Elite Issue 6
System Hardware Manual 4 - 3
2.3.2 Selecting a Permanent MDF Location
When selecting a permanent site for the MDF, the
technician may encounter some of the following
conditions.
Limited space is available but must be used.
The available space may pose one or more
environmental hazards.
The proposed location has limitations such as
insufficient lighting or the lack of a suitable ground
for the KSUs.
The technician that encounters these conditions
must provide the best possible solution for installing
the equipment. This document cannot cover all
possible situations, precautions, and actions.
2.3.3 Selecting a Site for Installing the Telephones
When a site is selected for telephone installation,
consider the following conditions to ensure proper
installation.
Ensure that the cable length and line resistance
(loop), between the KSU and the telephones,
comply with the specifications show in
Table 2-3
Multiline Terminal Loop Resistance and Cable
Length
.
Select a place where devices that require an
external power supply can be easily connected to
an AC outlet.
2.4 Constructing the Main Distribution Frame (MDF)
The Main Distribution Frame (MDF) consists of two different
standard quick-connect terminal blocks that are mounted on a 3/4”
plywood backboard. Mounting these blocks on standoffs for ease of
access is recommended. The recommended blocks are 66B50 for
termination of the MDF Cable Assembly and 66M50 for termination
of the station cables.
The Intermediate Distribution Frame (IDF) requires the 66M50
blocks only.