FINAL DRAFT - CISCO CONFIDENTIAL

1-2

CiscoONS 15216 EDFA2 Operations Guide
78-16033-01
Chapter1 Applications
Key Features
Figure1-1 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 ONS15216 EDFA2.

Figure1-2 ONS15216 EDFA2 Block Diagram
A
B
C
D
A
B
C
D
Fiber Cut
Wavelength is rerouted
Before After
61990
External AlarmsRx Tx
RS232
5VDC
Microcontroller
Isolator Isolator
Gain
Flattening
Filter
Pump
Laser Pump
Laser
VOA Output Input
71172
Output
Monitor
Control Circuit