CHAPTER 30. Analog Voice Port
458
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Figure 30.6 delay method signaling sequence
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
- -
Originating
Destination
M-wire
E-wire
M-wire
E-wire
seizure
digits
digits
answer
Min 70 msec
Max 10 sec
Min 200 msec
Min 120 msec
Max 6 sec
Seizure ack
Start dial
Min 10 msec
Max 6 sec
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