2 - 1 2
E F - 7 0 1 M I N T E R F A C E
TRANSMISSION METHODS
DIRECT CONNECTION
There are many instances where twisted-pair cable is available for audio connections. This
wiring is typically found in unused telephone cable in or between buildings. Figure 2-2
illustrates twisted-pair wiring connections.
Figure 2-2: Twisted Pair Wiring
14
13
- RS-422 Receive
+ RS-422 Receive
6
5
+ RS-422 Transmit
- RS-422 Transmit
14
13
- RS-422 Receive
+ RS-422 Receive
6
5
+ RS-422 Transmit
- RS-422 Transmit
DB-9 Pins
DB-9 Pins
9
10
1
2
- 4-Wire Audio Input to Party Line
+ 4-Wire Audio Output from Party Line
+ 4-Wire Audio Input to Party Line
- 4-Wire Audio Output from Party Line
9
10
1
2
- 4-Wire Audio Input to Party Line
+ 4-Wire Audio Input to Party Line
+ 4-Wire Audio Output from Party Line
- 4-Wire Audio Output from Party Line
EF-701M
EF-701M
Twisted Pair Wiring
