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Analog Voice ModulesPassport 4400 Hardware Installation Manual
8-14
Strapping
Strapping involves matching the voice/fax channel with the attached telephone
interface. Specifically, the voice/fax channel may be strapped, depending on the
application, for one of three common types of signaling conventions: FXS (Foreign
Exchange Station), FXO (Foreign Exchange Office), or E&M (Ear and Mouth).
AVMs installed in units are usually prestrapped to the interface type specified in
the order. Restrap only if you add a new AVM, if your interface requirements
change, or if your interface requirements are different from the way you ordered.
them. You may also need to temporarily restrap a voice/fax module if you perform
a level setting procedure. To verify the settings of your voice/fax channel(s)
without physically inspecting them, refer to 800-1952-20, Passport 4400
Operator’s Manual.
• In a dual-channel AVM, each channel may be strapped for a different
signaling convention.
• Place a strap over E41 (or E38 for Channel 2) if the cable to the PBX is too
long.
• Place a strap over E21 (or E18 for Channel 2) to connect the battery ground
to the SG lead.
• To select E&M, FXO, or FXS for each channel, consult the strap options
listed in Figure 8-16 below.
Figure 8-16. Location of AVM Straps
Back
Channel 2
Channel 1
E38
E39
E18
E19
E21
E20
E41
E40
E&M
FXO/FXS
E&M I
E&M II
E&M V
FXO
FXS
E&M strap options
FXO/FXS strap options
E&M
FXO/FXS
Note: Channels 1 and 2 have the same strap options, but
the straps for Channel 2 are arranged in the opppsite
direction (mirrored left/right in the diagram above).