Black Box BRTS-100 manual Transmit and line test

BRTS-100 ISDN TEST SET

	ECHO BITS=?
REC.		TRANS.
BRTS-100		NT1
TRANS.		REC.
	D=01010101...

D=E, LINE IS GOOD, PASS

D ≠ E, LINE IS BAD, FAIL

Figure 5-4. Transmit and line test.

D Activity (See Figure 5-5)

The D Activity test is designed to run when the Test Set is bridged onto the S/T interface with an ISDN terminal. D Activity will monitor the Echo bits for any D channel data transmitted by the terminal. The D Activity test is conducted as follows:

1.Upon pressing the INITIATE button, the Test Set tries to establish an ACTIVE link with the NT1.

2.If the ACTIVE state is established, the Test Set monitors the D bits and the red LED lights up whenever terminal activity is detected on the D channel (D = 0).

	ECHO BITS
TERMINAL	RX	RX	NT1
	TX	TX
	D BITS
BRTS-100	RX
	TX
	Figure 5-5.	D Activity.

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