Comdial Air Impact DSU, Manual

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2.14 Using The Add-On Expansion Module
You can install one or two optional add-on expansion modules on the common equipment base
unit to increase the line and station capacity of an installed system.
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 12 line by 24 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.
Table 2–9: Connecting Lines To The G0408 Expansion Module
Line
Jack
Pin
Number Connection
Telephone
Number
1
1 No Connection
2 Line 2M Tip
3 Line 1M Tip
4 Line 1MRing
5 Line 2M Ring
6 No Connection
2
1 No Connection
2 Line 4M Tip
3 Line 3M Tip
4 Line 3M Ring
5 Line 4M Ring
6 No Connection
IMI66–107 Digital Telephone System
Installing The DSU 2 – 41