Chapter 1
Tropos 7320 Router Installation Guide
37
Connecting Peripherals
The Tropos 7320 router can be configured to source DC power on the Ethernet connector pins
4,5 and 7,8, This capability allows the router to power remote peripherals such as backhaul
point-to-point radios, video cameras, or fiber optic transceivers. The Tropos Power over
Ethernet (PoE) power sourcing capability is a fully isolated supply and can be used to power
either positive or negative polarity peripherals.
Note
PoE power sourcing is not supported on DC-powered routers.
The Tropos PoE power sourcing capability differs from the IEEE 802.3af standard in the
following ways:
Tropos PoE includes support for multiple voltages; the 802.3af standard supports only 48V
operation.
Tropos PoE does not include support for auto-discovery.
Many IEEE 802.3af-compliant power devices (PDs) will operate using the Tropos power
sourcing equipment capabilities.
The router can supply up to a total of 30W of DC power distributed to the LAN port,
Management port, or both. Each port must be configured for the same voltage. To configure the
voltage, use the Tropos Configuration Utility (see the
Tropos Networks User Guide)
or an
element management system such as Tropos Control (see the
Tropos Control EMS Installation
and User Guide
). The DC output voltage can be configured to 12Vdc, 24Vdc, 48Vdc, or to the
Off state (0Vdc).
lists the maximum power output as a function of voltage.
In the event of an over-current or short-circuit fault event, the router will remove PoE output for
three to five seconds before attempting to resume sourcing power to the peripheral device.
Note
When the software restarts following a software upgrade, the PoE output will experience a disruption for
the period of the restart.
If the battery backup capability is installed, PoE output power is unaffected by the temporary
loss of AC power. The power sourcing feature continues to function during battery backup
operation (see
TABLE 5
PoE Power Sourcing Power Output
Voltage
Max PoE Power Output
12Vdc
30W
24Vdc
30W
48Vdc
30W
