An old 3COM 24 port PoE switch has a power budget of 192W. Each port is capable of supplying 29.6W per port. 24 ports multiplied by 29.6 watts equals 710.4W, way over the budget. In theory each Avaya IP Phone draws less than 7W.
You have 32 phones. Verify the power draw of each phone. Find a PoE switch with that power budget available.
Some moddel in specific , actually have 2 cisco sf-300-24p but they have a lot of jitter and packet loss in internal and external calls so i decided to replace they switch´s to one more robust. Any advice ?
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