User's Manual

ES520 Hardware Guide: Installation
10
48 Volt Powering
CAUTION: When
an ES520 version 2
Mesh Point is indoors
and powered by a 48V
power supply, that sup-
ply must be isolated
from its AC power
mains and chassis
ground to adhere to
802.3af PSE Safety stan-
dards.
If you use the Mesh Point’s weathertight 4-pin DC input to
supply 48V power to a weatherized, ES520 version 2 Mesh
Point installed outside, you can use WAN port PoE as a backup
supply.
As the higher voltage of two power supplies in this scenario,
the 4-pin 48V DC power input is primary. If it loses power, a
PoE midspan device can take over without interruption. A PoE
endspan device may allow a lapse before sensing that the
Mesh Point is powered down and resupplying it via the WAN
port. When the 4-pin, 48V DC power input is again receiving
power, it will again become primary.
NOTE: All power
inputs should be
applied before the Mesh
Point is put into regular
operation. When pow-
ered by endspan PoE,
particularly, plugging in
a redundant 48V power
source will cause the
Mesh Point to reboot.
In an indoor installation of an ES520 version 2 Mesh Point
using 48V power, you can connect any two or all three power
inputs to provide redundancy. If both the 48V barrel-style and
the 48V 4-pin DC power inputs are connected, the higher
voltage power source will serve as the primary supply. If the
two sources are supplying identical voltage, the two inputs
share the supply.
2.1.4 Internal LAN Switch PoE PSE Function
The Mesh Point’s Power over Internet Power Sourcing
Equipment (PoE PSE) function can supply up to 36 Watts of
power overall, with an additional maximum limit—
per interface
pair—of 16 Watts. The LAN switch’s eight Ethernet ports are
paired in sequence:
1 and 2, 3 and 4, 5 and 6, 7 and 8, as they
are vertically aligned on the Mesh Point’s front panel.
Figure 2.1. Internal LAN Switch PSE Maximums
15
2
73
468
ResetSW2
POELnk/Act
16W max. PoE per vertically stacked pair
16W
max.
16W
max.
16W
max.
36W max. PoE overall
PD Requirements:
PoE Class 0/3 = 15.4 W
PoE Class 2 = 7 W
PoE Class 1 = 4 W