| General > General Technical Chat |
| Looking for: Manageable Gbit ETH switch for 10" rack (8port+SFP, with PoE) |
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| tszaboo:
What I found, in IT it rarely make sense to future proof something, unless you have a specific use case with a specific deadline in mind. Otherwise if you buy equipment 2-3 years later, it is always cheaper to buy it than now. That being sad: Maybe look into Poe inserters. I doubt that you will need PoE on all ports, and switches are not designed with that in mind, except some rare cases, which are specifically made for camera systems and such. |
| madires:
PoE is quite popular with VoIP phones or access points. |
| Ranayna:
Indeed it is. Though i think what tszaboo means is, that virtually no switch is able to provide full power to every port that it has. They all have a power budget cap significantly lower than the theoretical maximum. But that is fine in most cases. It is relatively rare for IT equipment to really draw full power. For example our IP phones require around 6 to 7 watts in standby, with the display turned on, and not really much more while in a call. A lot lower than the ~15 Watts available with 802.3af. Similar with our WiFi 6 Access Points. Those stay below 20 watts, again lower than the ~30 watts of 802.3at. At least that are the values that our switches show me on the cli, and the switch also uses these actual values for the calculation of power budgets. |
| madires:
Yep! But don't forget the start-up power draw of the PoE powered devices! Anyway, there are PoE switches for most use cases. Smaller ones with a few PoE enabled ports, all ports PoE enabled with limited shared power, and also all ports PoE enabled supporting max. possible power. |
| tszaboo:
--- Quote from: Ranayna on December 23, 2021, 12:39:03 pm ---Indeed it is. Though i think what tszaboo means is, that virtually no switch is able to provide full power to every port that it has. They all have a power budget cap significantly lower than the theoretical maximum. But that is fine in most cases. It is relatively rare for IT equipment to really draw full power. For example our IP phones require around 6 to 7 watts in standby, with the display turned on, and not really much more while in a call. A lot lower than the ~15 Watts available with 802.3af. Similar with our WiFi 6 Access Points. Those stay below 20 watts, again lower than the ~30 watts of 802.3at. At least that are the values that our switches show me on the cli, and the switch also uses these actual values for the calculation of power budgets. --- End quote --- True. PoE standard can be anywhere from 0W to ~75W as I recall per port. So a 16 port switch would need to have 1KW power supply built in. Plus the magnetics is more expensive for PoE because it can go into DC saturation. And normal PoE is a smart protocol, you need an adjustable DC-DC per port. All of these cost money. |
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