
Appendix B
LEDs
LEDs
The Express XRT front panel contains five LEDs associated with the DTE port and the ISDN interface as shown in Figure 
TD  | RD  | B1  | B2  | PWR  | 
Express XRT  | 
  | TEST  | 
  | LINE  | 
  | 
  | Figure  | 
  | 
  | Front Panel LEDs | 
  | 
  | Table  | 
  | 
  | Express XRT LEDs | 
  | 
  | 
  | 
LED | Color  | Description  | 
  | 
  | 
  | 
B1 or B2  | Slow Green Flash  | Attempting SPID registration.  | 
  | Fast Green Flash  | Attempting TEI registration.  | 
  | Off  | Ready. No data traffic.  | 
  | Solid Green  | B Channel passing data (in use).  | 
  | Solid Amber  | Loopback protocol test (one or both  | 
  | 
  | channels).  | 
  | Amber Flash  | Remote test originate.  | 
  | 
  | 
  | 
Express XRT User Guide  | 71  |