QoS Proprietary vs. Standards based

Past

Agere Systems, Inc. VoIP “Phone-On-A-Chip” used a proprietary voice packet prioritization scheme called Ethernet Quality of Service using BlackBurst (EQuB), an algorithm (implemented in hardware) ensures that voice packets are given the highest priority in their collision domain.

2002

Their Phone-On-A-Chip solution now implements a software-based IEEE 802.1q tagging protocol (i.e. Virtual local area network (VLAN) tagging) for outgoing Ethernet frames.^†

^†Agere Systems. T8302 Internet Protocol Telephone Advanced RISC Machine (ARM®) Ethernet QoS Using IEEE® 802.1q,Advisory July 2001.

Transcript

[slide470] There have been lots of proprietary approaches to quality of service. One of them is one that Agere [Systems, Inc.] introduced, which was very interesting. To get high quality on an Ethernet, what did they do? They emitted this so-called black burst. They basically generated noise to cause everybody else to back off. And now their VoIP system didn't have to contend with other users. Not a very friendly approach, but they used it for a while. And then later, in 2002, they started using IEEE 802.1q. What does 802.1q [do]? Well, it lets me tag the packets and put them in a virtual LAN so I can basically create a logical virtual LAN for my VoIP traffic on the same network that's carrying all of my other traffic, and I can prioritize packets differently, etc.