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Chapter 1. Understanding ISDN and the Express 4110/4120
61200176L3-1 Express 4110/4120 User Manual 1-15
Express 4110 WAN Indicators
PWR Flashes when the link is inactive; solid when the link is active.
Phone 1/2 Flashes green when the link is being negotiated; off when the link is
active. After the link is active, 1 flashes green when a call on POTS line
1 is in progress; solid green when a call is connected.
Express 4110 Test Indicators
Phone 1/2 A slow amber flash indicates test in progress; a fast amber flash indi-
cates test has failed.
Figure 1-12. Express 4120 LEDs
Express 4120 LAN Indicators
1, 2, 3, 4 Link integrity. Illuminates when there is a good connection between
the Express 4120 and a NIC card.
TX/RX Flashes green when transmitting data onto the 10BaseT
connector.
Flashes yellow when receiving data from the 10BaseT
connector.
Express 4120 WAN Indicators
PWR Flashes when the link is inactive; solid when the link is active.
Phone 1/2 Flashes green when the link is being negotiated; off when the link is
active. After the link is active, 1 flashes green when a call on POTS line
1 is in progress; solid green when a call is connected.
Express 4120 Test Indicators
Phone 1/2 A slow amber flash indicates test in progress; a fast amber flash indi-
cates test has failed.