user manual

Table 200-15 DTA-E Unit / RS232C Connector Pin
Configuration
PIN # SIGNALFLOW 1 DESCRIPTION
with the RS-232C interface.
SECTION 230
SITE PREPARATIONS and MDFlIDF
CONSTRUCTION
230.1 GENERAL INFORMATION
This section presents a survey of the planning details
that should be considered prior to installing an Electra
Mark11 System. Detailed planning in advance of the
actual installation will help ensure that minimum
time and cost are incurred and, concurrently, will
cause a minimum disruption of the customer’s business
activities. ‘Additional benefits of a well planned and
executed installation include flexibility for changes
and expansion at minimum cost, efficient
maintenance, and increased customer satisfaction.
230.2 SITE SURVEY
In most cases, a survey of customer premise is needed
to develop a cost estimate of the installation. The
preliminary data should be used in the site selection of
the Main Distribution Frame (MDF). A second visit to
the job site may be necessary to obtain exact
dimensions of the area selected for the MDF, cable
lengths, and possible IDF locations. This information
will provide the basis for planning an orderly and
efficient installation.
For example, the collected data about the job site will
generally permit the MDF to be partially
preassembled at the installer’s shop, which helps to
minimize the time spent at a customer’s premises.
Preassembling the MDF and IDF is especially
advantageous for those jobs where the MDF, or IDF,
must be placed in an area that is awkward for this type
of work.
230.3 SITE LIMITATIONS
Installation of a telephone
ND-20292
CHAPTER 2
APRIL, 1990
system is seldom a
straightforward routine procedure. The uniqueness of
each customer’s situation requires a tailored approach
to each job. In selecting a permanent site for the MDF,
the installer may encounter problems such as the
following:
l Limited space is available and must be used,
regardless of its suitability.
0 The available space may be adequate but may
pose one or more environmental hazards.
0 The proposed location has limitations, such as,
insufficient lighting, or the lack of a suitable
ground, for grounding the CCUs.
Whatever the nature of the adversities encountered,
the installer must make the necessary decisions to
arrive at the best possible solution for the equipment
being installed and the customer. It is beyond the
scope of this document to cover all possible situations
and solutions. The following are general guidelines,
precautions and actions which should be observed to
help make the installation decisions.
NOTE:
Certain specific requirements and
precautions, if not followed, will impair the
reliability of the system.
230.4
SITE SELECTION CONDITIONS
The following conditions should be met at the site
chosen for mounting the Central Control Unit (CCU).
A.
B.
C.
Up to three CCUs are normally wall mounted to
protect against accident or flooding. When this is
done the fourth CCU must be wall mounted but
separated from the other three CCUs by an
additional base panel placed atop the third CCU.
Then the top panel is mounted on top of the 4th
CCU. When floor mounting is used with 4 CCU’s
there is no need for a second base panel, however,
the 4th CCU must be secured to a wall. Use of a
314” fire retardent plywood backboard is
recommended for this purpose.
The CCU should not be located directly beneath
pipes, due to the possibility of leaks or
condensation causing damage to the Electra
Mark11 equipment.
The area in which the CCU is to be located must be
free of corrosive and inflammable gases, excessive
chemical or industrial dusts, and other materials
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