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--- playground:mission-log-template1 [2015/06/18 12:01] – [Power Consumption Analysis] chrono
+++ playground:mission-log-template1 [2015/07/07 12:20] – chrono
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-====== Review: Managed Low-Power Switch DGS-1100-8 ======
-In a past Mission-Log, we've [[mission:log:2012:01:13:dlink-green-ethernet-switch-review|reviewed the power consumption of "green" Ethernet Switches]] (consumer-grade/unmanaged) that could be used in off-grid environments and they performed really well. Compliant with IEEE 802.3az Energy Efficient Ethernet, these switches consume less energy by cutting down on power consumption when the traffic volume is low and automatically measure the length of the connected cables to adjust power usage, when cables are shorter than 20 meters. In addition, they monitor the link status of every port and drastically reduce power consumption when a port has no link. With more technology and infrastructure, the need increased for more Ethernet features like VLANs, trunks and many other features, usually only offered by expensive, loud and very power hungry managed/enterprise switches.
-Luckily this situation has changed and we could test and already deploy a new pair of managed but very low power and fanless (silent) switches: The [[http://us.dlink.com/products/business-solutions/easysmart-8-port-gigabit-switch/|D-Link DGS-1100 Family]], which also come in a sturdy metal case and the benefit of a limited lifetime warranty.
-====== ======
-===== Power Consumption Analysis =====
-For better comparison all measurement results have been put together. A couple of people have been a bit unhappy, that we've only documented power consumption on the DC side in the past review (which is all we care about for off-grid usage). As a result, this time we've documented DC and Wall-Power consumption (with the original D-Link AC/DC plug)
-==== Test-Setup ====
-==== Results ====
-| ||  DGS-1008D G2  ||  DGS-1008D G3  || DGS-1100-8 Rev A1 |||
-| || {{:blog:2012-02-10:d-link-dgs-1008d.jpg?235|}}||{{:blog:2012-02-10:dlink-ds1008v2.jpg?235|}}||{{:blog:2012-02-10:dlink-ds1008v2.jpg?235|}}|||
-| Clients |Mode| 5V DC Current | 5V DC Power | 5V DC Current | 5V DC Power | 5V DC Current | 5V DC Power| 230V AC Power |
-| 0 | Switch only | 66-93mA | 0.33-0.46W | 67-111mA | 0.33-0.55W | 105mA | 0.52W | 0.8W |
-| 1 | Client Stdby | 100-160mA | 0.5-0.8W | 109-124mA | 0.54-0.62W | 131mA | 0.65W | 1W |
-| 2 | Client Stdby | 141-194mA | 0.70-0.97W | 153-161mA | 0.76-0.80W | 154mA | 0.77W | 1.1W |
-| 2 | Client Idle | 160-200mA | 0.8-1W | 170mA | 0.85W | 212mA | 1.06W | 1.5W |
-| 3 | Client SCP | 250mA | 1.25W | 210-220mA | 1.07W | 238mA | 1.2W | 1.7W |
-| 4 | Client SCP | 250mA | 1.25W | 210-220mA | 1.07W | 264mA | 1.32W | 1.9W |
-===== Reliability & Performance =====
-The DGS-1100-8 test candidates have been up and running 24x7 for more than 365 days now without any glitch or the necessity to power cycle.
-<WRAP round tip>
-When you make changes to the configuration in the web-interface, make sure to click the **"Save Configuration"** button in the top left menu to actually save your changes to non-volatile RAM. Otherwise the next power cycle will wipe your config changes :)
-</WRAP>
-===== Conclusion =====
-Grid powered devices still have the luxury to be able to consume more power than absolutely necessary, since the limiting factor is money and not power itself. Off-Grid scenarios change that point of view on costs, as the value is no longer money, but the painfully finite element of power itself.
-There are still a lot of devices out there with a standby-consumption of well above 10W, the DGS-1008D G3 connects 4 clients, actively transfers a lot of data and consumes about 1W. D-link obviously did a good job with this, although there is a little curiosity in StandBy: The G2 consumes a little less power in StandBy, when no clients are connected but the G3 saves considerably more power when active so overall the G3 is a very good evolutionary step in low-power consumption Gigabit-Ethernet technology.
-The only drawback of these switches is their un-managed nature. Hopefully, in the future even managed switches can operate with this kind of power consumption profile.
-Other manufacturers, who also build similar products, may always send us their products for hardcore real live evaluation as well :)
 {{tag>ethernet switch review hardware test energy}}
 ~~DISCUSSION~~

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