User manual

Chapter 1. Introduction
61200105L3-1A E&M+ Dual Voice Option Module User Manual 1-5
The E&M+ plug-on board labels PORT X.3 and PORT X.4 correlate
to the port numbering philosophy of the TSU 100/120/600 family
where
X represents the slot number, and .3 and .4 indicate the port
numbers. In this application, the port designations for the two
E&M+ voice module ports are 1.1 and 1.2. and, if added, the plug-
on board port designations are 1.3 and 1.4. These port numbers
appear in the front panel LCD menu displays.