Specifications

Connecting Lines To The JM408 Expansion Module
The expansion module’s line connections 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 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
IMI66–132 DSU II Digital Telephone System
2 – 42 Installing The DSU II Digital Telephone System