ADTRAN L128 - Manual (Page 34)

Chapter 1: Understanding ISDN and the Express L128/L128T
61202.070L1-1 Express L128/L128T User Manual 17
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.
Figure 1-6
Express L128/L128T LEDs
LI
EXPRESS L128T
TX/RX B1 B2 PWR
LINE TEST