Interphase Tech iSPAN 5535 PRI - Manual (Page 88)

Interpreting Adapter LEDs
68 Interphase Corporation
LED functions differ depending on whether the adapter is
configured to operate in North America (with T1/PRI access),
in European countries other than France (with E1/PRI access
and CRC4), or in France (with E1/PRI access and no CRC
type).
North America
In North America, the adapter LEDs for each port function are
as follows:
In their operational state, the LEDs must be as follows:
LED Color Meaning if the light is ON...
1 Green Clock is synchronized.
2 Green Physical layer is active.
3 Yellow Your ISDN provider is currently sending an RAI alarm
to the adapter.
4 Red Loss Of Signal (LOS), indicating no electrical power is
detected on the line.
LED Color State must be...
1 Green On
2 Green On
3 Yellow Off
4 Red Off