Clear-Com EF-701M - Manual (Page 36)

2 - 1 4 E F - 7 0 1 M I N T E R F A C E
There are two basic modes of fiber-optic transmission. In a multimode fiber, the light
travels through the fiber via multiple paths. In a single-mode fiber, the light travels in a
single path. Depending on the equipment, single or multiple channels of audio, video,
data, or a mix thereof can be multiplexed and carried in either one or both directions.
Figure 2-3 illustrates wiring connections to a popular type of multimode fiber-optic
modem over shielded-pair cable.
Figure 2-3: Shielded Wiring
1
2
3
4
5
6
1
2
3
4
5
6
J1B J1A
Pin 1
J1A
J1B
1
2
3
4
5
6
9
10
11
12
13
14 - RS-422 Receive
+ RS-422 Receive
RS-422 Receive Shield
4-Wire Audio Input Shield
- 4-Wire Audio Input to Party Line
+ 4-Wire Audio Input to Party Line
- RS-422 Transmit
+ RS-422 Transmit
RS-422 Transmit Shield
4-Wire Audio Output Shield
- 4-Wire Audio Output from Party Line
+ 4-Wire Audio Output from Party Line
EF-701M
- Data Out
+ Data Out
Ground
Audio Shield
- Audio Out
+ Audio Out
- Data In
+ Data In
Ground
Audio Shield
- Audio In
+ Audio In
Fiber Options
249B-T/1B44
or
249B-R/1B44
Shielded Wiring