| Phase one: the microsegmentation |
| phase. Companies retain hubs and |
| routers but insert a LAN switch to |
| enhance performance. |
| Phase two: ATM technology and routing |
| between switches. LAN switches perform |
| switch processing and provide dedicated |
| bandwidth to the desktop and to shared- |
| media hubs. Backbone routers are |
| clustered by ATM switches to increase |
| backbone bandwidth, matching the |
| increased bandwidth in the wiring |
| closet. |