| ATM
is a core technology |
| Comressed
video |
| File
transport |
| Comressed
speech |
| Web services |
| PCM speech |
| IP transport |
| Real-time
applications |
| Non-real-time
applcs. |
| ATM |
|
|
|
| Physical
layer |
||
| (SDH/Sonet) |
||