APPENDIX A
Acronyms
| Acronym | Expansion |
| 1R | Regeneration without reshaping or retiming |
| 2R | Regeneration with reshaping but no retiming |
| 3R | Regeneration with retiming and reshaping |
| AAL | ATM adaptation layer |
| ACTS | Advanced communications technologies and services |
| ADM | Add/drop multiplexer |
| AGC | Automatic gain control |
| AIS | Alarm indication signal |
| ANSI | American National Standards Institute |
| AON | All-optical network |
| AOTF | Acousto-optic tunable filter |
| APON | ATM passive optical network |
| APD | Avalanche photodetector |
| APS | Automatic protection switching |
| AR | Anti-reflective |
| ASE | Amplified spontaneous emission |
| ASON | Automatic switched optical network |
| ASTN | Automatic switched transport network |
| ATM | Asynchronous transfer mode |
| ATMOS | ATM optical switching |
| AWG | Arrayed waveguide ... |
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