Power availability
151
Pin
Signal
Description
3
TX+/power-
Transmit Data +/power-
4
Not applicable
Not applicable
5
Not applicable
Not applicable
6
TX-/power-
Transmit Data -/power-
7
Not applicable
Not applicable
8
Not applicable
Not applicable
Power availability
You can use the Nortel Ethernet Redundant Power Supply Unit 15 as an
external power source for the 4550T-PWR and the 4548-GT-PWR switches.
The following are the three options to power the switch:
•
internal power source only
•
external power source only
— Nortel Ethernet Redundant Power Supply Unit 15
•
internal power source plus external power source
— Nortel Ethernet Redundant Power Supply Unit 15
You can add an external power source to the 4550T-PWR and the
4548-GT-PWR. You can use an optional power and control cable for this
purpose and plug it in the back of the switch.
You can allocate a maximum of 16 W of power for each port to the PoE
devices connected to the 4550T-PWR or the 4548-GT-PWR. You can
allocate power by using the physical power sources.
The power sources are physically attached to the switch. You can have only
the internal power or you can attach an optional Nortel Ethernet Redundant
Power Supply Unit 15. Ensure that you know the actual physical power
sources for your 4550T-PWR or your 4548-GT-PWR.
Internal power source only option
Using the 4550T-PWR or the 4548-GT-PWR switch and its internal power
source only option, you have a total of 320 W of available power. You can
power up to 48 ports at 6.6 W for each port with this configuration or 20
ports at a maximum power of 15.4 W for each port.
The following figure illustrates the switch operating on internal power source
only.
Nortel Ethernet Routing Switch 4500 Series
Overview — System Configuration
NN47205-500
02.01
Standard
5.0
23 February 2007
Copyright © 2007, Nortel Networks
Nortel Networks Confidential
.
