Figure 4-9 4W Leased Line Option - Electrical Connections; Figure 4-10 Typical 4-Wire Line Modem Interconnection - Motorola IRRInet-XL Owner's Manual

• Four-Wire Line Connection (See Figure 4-9)

Figure 4-9 4W Leased Line Option - Electrical Connections

1. Set both switches of dip switch 2W / 4W SELECT on the front panel of the Line
Interface Unit to position 4W.
2. Connect the Tx line wires to terminals #1 and #2 of the unit's front panel TB (See Figure
4-10). The polarity is insignificant. Note that this line should be connected to the Rx input
of the line's interface (modem) at the other end of the line.

Figure 4-10 Typical 4-Wire Line Modem Interconnection

3. Connect the Rx line wires to terminals #4 and #5 of the TB on the front panel of the unit.
The polarity is insignificant. Note that this line should be connected to the Tx input of the
line interface (modem) at the other end of the line.
1 1 1
3 2 3 2 3 2
5 4 5 4 5 4
6 6 6
To
CPU
PROT
GND
4W Leased Line 4W Leased Line
Tx
Rx
DIP Sw itch
4W position
Tx
Rx
4-13