ADTRAN L128T user manual WAN Indicators, Test Indicators

	Chapter 1: Understanding ISDN and the Express L128/L128T
WAN Indicators
PWR	Flashes when the link is inactive; solid when the link is active.
B1	Flashes green when the link is being negotiated; off when the
	link is active. After the link is active, B1 flashes green when a
	call on B1 channel is in progress; solid green when a call is
	connected.
B2	Flashes green when the link is being negotiated; off when the
	link is active. After the link is active, B2 flashes green when a
	call on B2 channel is in progress; solid green when a call is
	connected.
Test Indicators
B1/B2	A slow amber flash indicates test in progress; a fast amber
	flash indicates test has failed.
		TX/RX	B1	B2	PWR
	LI
	EXPRESSL128T
				TEST	LINE

Figure 1-6

Express L128/L128T LEDs

61202.070L1-1 Express L128/L128T User Manual 17