System information

68 IBM and Cisco LAN Switching: Interoperability and Migration Guide

physical Ethernet and token-ring LANs, and not only attached to the ATM

backbone. This does not affect the principles of our scenario.

Figure 44. ATM LAN backbone before migration

The solutions this network provides for its users include:

• High-capacity backbone for token-ring LAN

• High-speed server connections

• Managing broadcasts

• Integration of Ethernet and token-ring

• Interfacing multimedia equipment

• Sharing bandwidth between data and telephony transports

• Bridging special-purpose ATM equipment to legacy LAN

It is likely that this network started as pure token-ring. Then the traffic on the

backbone ring grew and the servers needed more bandwidth. Technical

applications on UNIX workstations demanded Ethernet. The server

connections support both emulated Ethernet and emulated token-ring, but

IBM 8265

8270

8271

8270

Before

MPEG,H.320

CES,CAS

Video

Telephony

Special

WAN