As agreed during the meeting in York, the DTE Power Via MDI Study Group's five Criteria and proposed Objectives were presented at our meeting on the eighth of November.†† In attendance were 35 Telecommunications Industry Association members representing a wide cross section of the telecom industry.† All present expressed support for the project that Study Group has proposed and will provide input where applicable.
Due to and intense interest in the Study Groupís objectives, about half of the one day meeting was devoted to their discussion and review.† This resulted in the three suggestions that are attached.† We hope that they can be considered and included in the final objectives of the Study Group.
††††††††††† Phil Holland
Suggestions from TR-41.3.4: †Performance and Interoperability Requirements for Voice-over-IP Telephone Terminals
A.† Common Powering for 10/100/1000BASE T Networks
The TR-41.3.4 working group supports and would like to have additional emphasis placed on the DTE Power via the MDI Study Groups first two objectives.† To clarify the emphasis that the working group felt should be placed on the first objective, the following revised wording was suggested.
1.†† Economically provide power to 10BASE- T and 100BASE- TX devices, and not preclude powering 1000BASE-T devices.†
2.†† Select one power distribution technique for world-wide use
Today, 10/100BASE-TX networks are common. These will move to 100/1000BASE-T in the near future.† A power methodology that supports 10/100/1000BASE-T networks is therefore HIGHLY DESIRABLE.† For this reason, any powering methodology selected must not preclude 1000BASE-T products in the future.
We recognize the 1000BASE-T networks could be difficult to support.† While it may not be possible to include 1000BASE-T in the initial version of an IEEE 802.3 DTE Power via the MDI, future technologies may make this possible as long as the wiring scheme does not preclude it.† Leaving this option open is important.
An additional objective should be to recognize that intermediate devices may need to be powered via the MDI and in turn pass power on to an endpoint.† These intermediate devices will be required to facilitate the economic mass deployment of VoIP telephones.
For example, consider a small router placed in an office to connect a VoIP Telephone, a PC and other devices that require powered or un-powered connections.† Passing power through such devices is important to provide an economic means of supplying backup power.† Telephones and their related network infrastructure must remain operational during a power failure.
Any powering methodology defined by the Study Group should be compatible with existing, internationally recognized safety standards.