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IMI 66-083
Instalk:
SECTION 3
ADD-ON EXPANSION MODULES
INTRODUCTION
One or two optional add-on expansion modules can
be installed on the common equipment base unit to
increase the line and station capacity of an installed
system. The add-on module is as follows:
l
408 Expansion Module
-
A four-line by eight-station
expansion unit
The expansion capabilities provided by the add-on
module are shown in
Figure 3-14
on the next page.
The default numbering of the expanded lines and
stations begin with the next higher line or station port
number from that provided by the host base unit. The
numbering continues sequentially from top module to
bottom module if two modules are installed. For
example: The defaulted 8-line, 16-station base unit
provides station ports 10 through 25 and lines 1
through 8. When installed, a 408 Expansion module
will provide station ports 26 through 33 and lines 9
through 12 thus creating a twelve line by twenty-four
station system.
Each expansion module provides a tip and ring pair as
an emergency power failure circuit. This circuit is
connected to the first module-provided line.
The line connections of the expansion module are
available at two modular jacks. When facing the jack
openings, lines 1 and 2 are provided by the jack on
the right and lines 3 and 4 are provided by the jack on
the left. Line connections are detailed in Table 3-5,
below.
The station connections are available at a 50-pin
connector.
Table
3-6 detail these station connections.
Table 3-5. Line Connections
-
408 Expansion Module
1
6
1
No Connection
I
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3-23