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Connecting the Expansion ModulesPassport 4400 Hardware Installation Manual
4-10
Use of Terminal Block
On FXS and FXO interface modules, the 4-pin terminal block is an alternate
method of connection to the telephone interface equipment. The FXS and FXO
interface modules provide a direct connection to the common signal ground (SG)
of the line power.
On E&M interface modules, the 8-pin terminal block is the only method of
connection to the telephone interface equipment; there is no modular jack.
Figure 4-9. Terminal Block Cable Connections
Caution:
!
Wiring to the tie trunk terminal block should be carried out by a
qualified technician. Wires used for this purpose must be UL type
CM, 22/24 AWG, 8-conductor.
Connector
Cover
Terminal
Block
Back Panel Of
Interface Module
Left Tab
Right Tab
Secure Cable Leads
Here (8 Places)
Terminal
Block Plug
Insert Cable
Lead Here
(8 places)
FXS
1
E&M
FXO and FXS
Insert Cable
Lead Here
(4 places)
Secure Cable Leads
Here (4 Places)
1