Fiber Driver
EM316E1/EM316T1
P/N: 1218003-001, REV_O PAGE 8
• PWR/NMS: illuminates when unit is powered (green color), flashes (green color)
when remote or local loop back is enabled by management. The
remote loop back feature provides a quick check of the basic
functionality of both modems and both fiber optic cable paths. It will
send a signal that causes the remote EM316E1/T1 fiber modem to
loop its received data and send it back out as its transmitted optical
signal, this will cause the loop back indicator to flash (green color)
• TX: flashes when Fiber TX is active, (OFF through all zeros transmission)
• RX: flashes when Fiber RX is active
• AIS: Alarm Indication Signal illuminates when unframed all-ones
condition is detected, using the detection criteria of less than 9 zeroes
out of 8129 bit periods.
• LOS: Loss of Signal illuminates when 175 consecutive zeroes have been
received. LOS return low when the ones density reaches 12.5%
(based upon 175 bit periods starting with a one & containing less than
100 consecutive zeroes).
• SD: illuminates when fiber signal is detected