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Chapter 4: Configuring your VOIP
Multi-Tech Systems, Inc. 51
E&M Interface Types
There are five different types of the E&M interface and the MVP210/410/810 models support them all; but
Type IV is largely unused and will not be detailed in this section. The figures below will show the pin
assignments for the MVP RJ48 connector when used in the E&M jacks on the back of the unit as well as
how the signals are used for types one, two, three and five. Common ground between the MultiVOIP and
PBX is required for all E&M Types except Type II. Two and four wire audio is available for all E&M Types
and is shown in figure 4-9 below.
Figure 4-9: MultiVOIP E&M Pin assignments and RJ48 Jack
Figure 4-10: E&M Line Types
Figure 4-11: Audio wiring