100VG AnyLAN (2)
comparison between CSMA/CD and Demand Priority:
- CSMA/CD: try to send whenever there is data
- Demand Priority: only send when it is O.K. to do so; a station demands of the hub the permission to send and indicates the priority; hub services higher priority first.
topology: cascade to 3 levels of hubs (total network span=1200m)
hardware: NICs PCI-VG10/100, EISA-VG10/100 , ISA-VG10/100 with 2 RJ45 (one for ethernet, one for VG); VG-HUB with RJ45 VG ports, HUB with ethernet-to-100VG Bridge
vendor: Ragula Systems, Cisco, Cabletron, Hewlett Packard, etc