Black Box 39004, 39005 Connectors, Indicators, and Controls, Connector, Indicator, or Control

CHAPTER 3: Connectors, Indicators, and Controls

3. Connectors, Indicators, and

Controls

10

1

9

	TX RX
I/F	FO/S	FO
		RX TX
	C
	LL DL
	LOOP

2 3 4 5 6 7 8

	A
	Figure 3-1. Front and Rear Panels.
	Table 3-1. Connectors, Indicators, and Controls
No.	Connector, Indicator, or Control
1	TX LED: Transmitting binary 0 via fiber optic
2	G.703 connector
3	FO/S LED: Power/FO Link/sync
4	LL LED: Unit in line loop mode*
5	DL LED: Unit in digital loop mode*
6	Loop mode button
7	ST connector for fiber optic receiver
8	ST connector for fiber optic transmitter
9	C LED: G.703 signal present
10	RX LED: Receiving binary 0 via fiber optic
A	Power connector

*Both LEDs lit: Unit is in remote loop mode.

9