| Table 2: LED descriptions  | 
  | 
  | 
LED | Description | 
  | 
  | 
E1 Link  | (Active Green) Solid green (On) indicates that the end to  | 
  | end E1 Link is up, signifying that the link is active. The E1  | 
  | Link LED is Off when the link is down.  | 
  | 
  | 
10BT Link  | (Active Green) Solid green indicates that the   | 
  | Ethernet interface has detected a valid SQE heartbeat,  | 
  | signifying a valid   | 
  | 
  | 
Status  | Blinks yellow from one to eleven times to indicate system  | 
  | status. Each pulse pattern is separated by a 2 second  | 
  | “off” period. Greater pulse patterns have higher priority  | 
  | (buffer saturation has greater priority than an empty MAC  | 
  | table). Valid system statuses are:  | 
  | 1   | 
  | 2 pulses   | 
  | 3   | 
  | from base unit are not asserted  | 
  | 4   | 
  | 5 pulses   | 
  | 6 pulses   | 
  | 7   | 
  | 8   | 
  | 9   | 
  | 10   | 
  | aligned  | 
  | 11   | 
  | CRC  | 
  | 
  | 
TM  | (Active Yellow) Solid Yellow indicates an Active Test  | 
  | Mode.  | 
  | 
  | 
18