User's Manual
Table Of Contents
ES520 Hardware Guide: Installation
11
NOTE: In order to
supply PoE, the
Mesh Point must be lo-
cally powered by either
the AC-to-DC adapter
or 48V 4-pin input. Both
48V power supplies are
highly isolated to meet
PSE standards and will
provide up to 36W of to-
tal PSE power.
The IEEE 802.3af standard classifies PoE powered devices
(PDs) according to the amount of power allocated for them:
Class 3 PDs are allocated 15.4 W.
Class 2 PDs are allocated 7 W.
Class 1 PDs are allocated 4 W.
Class 0 is a catch-all for devices that cannot be otherwise
classified; PDs in this class are allocated 15.4 W.
The Mesh Point supports a small set of legacy devices that do
not comply with the 802.3af classification standard:
Cisco® AP 1100 WAP
Cisco AP 1200 WAP
Cisco AP 350 WAP
Cisco 7910 IP Phone
Cisco 7940 IP Phone
Cisco 7960 IP Phone
Nortel® i2002 IP Phone Phase 1 sets (with Power-Splitter)
Nortel i2004 IP Phone Phase 1 sets (with Power-Splitter)
These devices fall into the 802.3af catch-all Class 0 and are
allocated 15.4 W regardless of their actual power
requirements.
Table 2.1 shows the total number of PDs of various classes
and combinations of classes that the Mesh Point can support
overall.
When a PD is plugged into a PoE-enabled LAN port, it will be
powered up only if there is sufficient overall power available to
allocate to a device of its class. If the Mesh Point would exceed
its maximum of 36 Watts by allocating the amount of power
Table 2.1. Maximum Connected PDs by PoE Class
802.3af Class
Total Power
Allocated
0 & 3 2 1
20 1 36 W
12 1 34 W
11 3 35 W
10 5 36 W
05 0 35 W
04 2 36 W
03 3 33 W
02 5 34 W
01 7 35 W
00 8 32 W