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Analog Voice Modules Passport 4400 Hardware Installation Manual
6-3
E&M
• Used in a tie-trunk environment, when the voice channel is connected
to the trunk circuit of a PBX.
• It may be strapped one of three ways to select one of three E&M formats
(Types I, II/IV, or V).
Figure 6-4. Interface Requirements for E&M
Analog Voice Module
The Analog Voice Module converts analog signals to digital for processing by
the Passport 4400 unit. FXS, FXO and E&M interfaces are determined by
changing the straps on the front of the module’s circuit board.
Figure 6-5. Rear View of Analog Voice Module
Note:
When an FXO voice channel is to be connected to the Public
Switched Telephone Network, you must use the modular
connectors and the supplied modular cable(s).
Caution:
!
When using the RJ-48C cable (NTMU88AA) supplied with the
Analog Voice Module, pin 1 (SB) has live -44 volts dc on it. If not
used (such as in FXO or E&M Type I connections), make sure that
pin 1 (blue SB) lead is cut off and insulated.
E&M
PBX
Station Side
Trunk Side
Voice Channel
When the Telephone Interface is:
Use
FXO/FXS ports
E&M ports
Module Switch Group
(see Figure 10-1 on
page 10-3)
Single Channel
Dual Channel
Channel 1
Channel 2
Strapping Connectors
(see Figure 6-6 on
page 6-4)
FXO/FXS Port
E&M Port