F I N A L D R A F T - C I S C O C O N F I D E N T I A L
1-2
Cisco ONS 15216 EDFA2 Operations Guide
78-16033-01
Chapter 1 Applications
Key Features
Figure 1-1
Wavelength Protection Switching
After a protection switch occurs, the number of wavelengths on each fiber changes. In the example, the
number of clockwise wavelengths increases to three, while the number of counter-clockwise
wavelengths decreases to one.
1.3 Key Features
Figure 1-2
shows a block diagram of the ONS 15216 EDFA2.
Figure 1-2
ONS 15216 EDFA2 Block Diagram
A
B
C
D
A
B
C
D
Fiber Cut
Wavelength is rerouted
Before
After
61990
External Alarms
Rx Tx
RS232
5VDC
Microcontroller
Isolator
Isolator
Gain
Flattening
Filter
Pump
Laser
Pump
Laser
VOA
Output
Input
71172
Output
Monitor
Control Circuit
