8
Configuration
Start and usage.
Power on.
Connect the power cord to the 21-216 and then connect to mains.
If the link doesn’t work, try to cross-connect the fibers at one end.
LED-status.
There are 13 LED-indicators at the front panel.
PSU1
A green LED lit when power is connected to the unit.
CHANNEL
Four yellow LED’s representing the channel chosen by DIP switch at rear panel.
The channel is “calculated” by adding the lit LED’s.
For example if LED
1
and LED
2
are lit
1+2=3
Channel 3 is chosen.
This means that data to/from G.703 codir-port is sent and received on the IEEE C37.94
protocol on the fiber.
The fiber protocols bits for N, named p,q,r,s in the IEEE 37.94 standard are always set to
N=1, (0,0,0,1). This means that 21-216 will send 1 channel and active data will be sent on
channel 3. The remaining 11 channels will have idle data - all ones. 21-216 will also accept
data on channel 3.
