Performance comparison of 100Base-T fast ethernet and 100VG-AnyLAN

✍ Scribed by Tee Hiang Cheng

• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 609 KB
• Volume: 35
• Category: Article
• ISSN: 0360-8352
• DOI: 10.1016/s0360-8352(98)00170-3

✦ Synopsis

There are two competing technologies for 100 Mbps Ethemet, namely IEEE 802.3u 100Base-T Fast Etbernet and IEEE 802.12 100VG-AnyLAN. The former technology is based on the same medium access control protocol as the popular IEEE 802.3 CSMA/CD network, while the later is based on a new demand priority protocol. Contrary to common belief, a test conducted recently by Newman and Levy using amunercially available adaptor cards and hubs showed that 100Base-T networks outperformed 100VG-AnyLAN networks with similar configurations by a significant margin. From the analytical models developed, we found that the anomaly is due to the larger-than-expected overheads incurred by the 100VG-AnyLAN hub in polling every station in the network in a round robin manner.