Re: Selection Criteria for choosing a Discovery Method
I applaud Bob's suggestion and his offer to maintain this information. I
think it will be helpful in reaching a decision. I include below my
proposals for criteria.
Regards
Don Stewart
______________________
Criteria Categories and Specific Elements:
Non Interfering
(I-1) Does not interfere with 10/100 Ethernet via cross-talk
(I-2) Minimizes cross-talk interference potential to Gigabit Ethernet and
unidentified future services
(I-3) Minimizes EMI
Detection Robustness and Flexibility
(R-1) Avoids "false positive" detections (quiet and noisy environments)
(R-2) Reliably delivers power to proper PEs (quiet and noisy environments)
(R-3) Avoids giving power to paralleled devices
(R-4) Potential for detecting multiple classes of PE
Avoids Damage to DTE
(D-1) Low risk of equipment damage IF power is ever inappropriately
provided
Efficiency
(E-1) Ability to deliver maximum, usable power to the PE
Cost
(C-1) Leverages the necessary function of precisely monitoring current
levels to inexpensively perform detection
(C-2) Amenable to integrating into the PHY
(C-3) Compact, allowing high density PSE implementations
(C-4) Compact for PE implementation
(C-5) Amenable to low cost Mid-span implementations - Env A (including main
necessary elements: sense over/under current, signature detection, power
on/off control, on/off switch for current)
(C-6) Amenable to low cost LAN-switch integrated implementations - Env A
(including main necessary elements: sense over/under current, signature
detection, power on/off control, on/off switch for current)
(C-7) Amenable to Mid-span Env B implementations
(C-8) Amenable to LAN-switch integrated Env B implementations
Survivability
(S-1) Ability to survive ESD
(S-2) Ability to survive Cable discharge
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Donald (Don) S. Stewart Phone: 732-817-5495, FAX x4666
Avaya Inc. e-mail: dsstewart@avaya.com
(former Enterprise Networks Group of Lucent Technologies)
Cross-Product Architecture
101 Crawfords Corner Road
Holmdel, NJ 07733