CHAPTER 5. Analog Voice Port
468
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Analog E & M Type
For Analog E & M, the type
(I-V)
distinguished depending on the status
of
On-hook/off-hook is used, Submarine supports E & M Type I, II, III, and V
Type. Table 30.1 explains the difference on signaling for E & M type.
Table 30.1 E & M Wiring and Signaling Methods
E & M
Type
E-Lead
Configuration
M-Lead
Configuration
Signaling
Battery Lead
Signaling
Ground Lead
I Output,
Relay
to ground
Input,referenced
to ground
- -
II Output,
Relay
to SG
Input,referenced
to ground
Feed for M,
connected to -
48V
Return for E,
Galvanically isolated
from ground
III Output,
Relay
to ground
Input,referenced
to ground
Connected to
-48V
Connected to
ground
V Output,
Relay
to ground
Input,referenced
to -48V
- -
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