Selecting A Permanent Mdf Location; Selecting A Site For Installing The Telephones; Constructing The Main Distribution Frame (Mdf) - NEC Univerge SV9100 System Hardware Manual

Issue 3.0
2.4
SV9100 System Hardware Manual
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 chassis.
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 cable length and line resistance (loop), between the chassis

and telephones, comply with the specifications listed.
Select a place where devices that require an external power supply

can be connected easily 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-inch 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 (cross connection wire) to the terminal block
(cross connection 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.
The CHS2UG-US chassis can be mounted on the wall, the floor, a stand or in a
rack. The CHS2UG GW-US chassis can be mounted on the wall, a stand or in a
rack. Plywood should first be installed on the wall where the chassis will be
positioned, to allow for secure anchoring. It has a bracket, which can be used to
secure each chassis in any installation. Ensure that enough space is available to
allow the installation of the additional chassis above and below the Controlling
Chassis.
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