beautypg.com

Transmission methods, Direct connection, Figure 2-2: twisted pair wiring – Clear-Com EF-701M User Manual

Page 34

background image

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