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Analog Voice Modules Passport 4400 Hardware Installation Manual
6-9
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 (see Figure 6-12 on
page 6-10). 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 (see
Figure 6-12 on page 6-10).
On Voice/Fax Switch modules, installation may be suitable for modular
connections. Use the three modular cables to make your connections to the
telephone, FAX, and PSTN interfaces. After the connections are made, install
the connector cover.
Note:
When an FXO voice channel is to be connected to the Public
Switched Telephone Network (PSTN), you must use the
modular connectors and the supplied modular cable(s)
Terminal Block Connection
Refer to Figure 6-12 on page 6-10 for reference while connecting the terminal
block.
1. Remove the plug from the terminal block.
2. Use a cable (not supplied) with bare-wire leads. Insert each cable lead
into the cutout at the front of the plug and secure it with a small
flathead screwdriver at the top. It is recommended that the cable leads
be color coded for easy identification.
3. Insert the plug that now includes the cable leads in the terminal block.
4. After the connection is made, install the connector cover by inserting
the right tab of the cover in the retaining slot of the interface module
back panel. Secure on the left side with a Phillips-head screw.
Caution:
!
When using the RJ-48C cable (NTMU88AA) supplied with the
AVM, pin 1 (SB) on the lug end, has live -44 volts dc on it. If not
used (such as in FXO or E&M Type I connections), make sure
that the pin 1 (blue SB) lead is cut off and insulated with electrical
tape to prevent contact with any object or equipment.
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.