Black Box BRTS-100 manual Check Loop, Check Power

BRTS-100 ISDN TEST SET

		CHECK POWER
		PUT CIRCUIT IN
		POINT TO POINT
		CONFIG. (CONFIG. 1)
		DOES			NO
		TERMINAL
		NEED PHANTOM
		POWER?
	RED		YES	GRN
		PHANTOM
		LIGHT?
			NONE
TX & RX		NO
PAIRS		BATTERY
TRANSPOSED		FROM NT1

CHECK POWER

If the terminal requires power from the line, this procedure will verify that power is being transmitted properly. Assumes the Test Set is in NORMAL mode.

DOES		YES
TERMINAL NEED
PS2 POWER?
NO	GRN		RED
		AUX LIGHT?
			NONE
		NO		WIRES
POWER OK		BATTERY	ON PINS 7
		ON PINS		& 8 ARE
	7 & 8		CROSSED

Figure 4-5. Check power flow chart.

4.4 Check Loop

This procedure checks for physical impairments in the S/T interface. See Figure 4-6 for an outline of the functions performed during this test. Before implementing this procedure, you must meet the following prerequisites:

•The terminal should be receiving proper power (see CHECK POWER, page 14).

•LINE TEST should fail.

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