Selecting A Site For Installing The Telephones; Constructing The Main Distribution Frame (Mdf) - NEC Electra Elite IPK II System Hardware Manual

Electra Elite IPK II
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2.4
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System Hardware Manual
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 being 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 listed in
Terminal Loop Resistance and Cable Length on page 3-22
Table 3-7 Electra Elite/D
Resistance and Cable Length on page
Select a place where devices that require an external power
supply can be easily connected to an AC outlet.

Constructing the Main Distribution Frame (MDF)

The Main Distribution Frame (MDF) has 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.
Both the MDF and the IDF use standard bridging clips for each terminal block.
The bridging clips mate the left half of the terminal block (terminated cable
run) to the right half of the terminal block (crossconnection wire) to the
terminal block (crossconnection wire). The bridging clips are also useful during
troubleshooting to help isolate the cable runs and terminals/telephones from
the central equipment and the Central Office Network from the system. Refer
to Figure 5-1 Typical Full MDF
term
Table 3-6 D
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Series E Multiline Terminal Loop
Layout.
Document Revision 3
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Series i or D IP
and
3-23.
5 - 3