- Sun 21st Mar 2021, 10:37
You need to ask your network administrator, only they know what hardware they have installed and what it's rated for.
To give an example, a NETGEAR GS116LP 16-Port Gigabit Ethernet PoE Network Switch comes with a 76W PSU. A Cisco 7821 draws 3.84 watts and so if you took 16 phones and connected them all to the NETGEAR GS116LP used in this example the total current drawn would be 61.44 watts, this is acceptable. If you used the same PSU on a 24-port switch running 24 Cisco 7821's then the total current drawn is now 92.16 watts, this is bad and you will encounter issues because the POE switch doesn't have enough power to run all 24 phones.
Because each POE device that you connect to your POE switch has a "watt" ratting and the total shouldn't exceed the POE switches max rating, most manufacturers such as NETGEAR offer higher rated PSU's (sold separately) for use with their switches for this very reason.
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