Interphase Tech RAS Communications Controller 5536 - Manual (Page 142)

Interpreting LEDs
122 Interphase Corporation
The following table describes the board status when the
sequence of LEDs appears as follows:
4 Red Off
LED1 LED2 LED3 LED4 Meaning
On On Off Off Board is operational.
On Off On Off Your E1/PRI line requires CRC4. Select
the CRC4 option. (See
Setting Up ISDN
Port Properties on page 80 .)
On Off Off Off Your E1/PRI line requires CRC4. Select
the CRC4 option. (See
Setting Up ISDN
Port Properties on page 80 .)
Off Off Off Off Either no electrical signal is on the
E1/PRI line, or your ISDN provider is
sending an AIS alarm to the board.
Make sure your cable is plugged in
correctly.
LED Color State must be...