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5. Observations
Table 1 shows the detected class and power allocated from the Nortel 5520-24T-PWR switch. IP
Telephones were connected directly to the switch. Cables of different lengths were used. Cable
length and impedance affects power usage, so the measurements listed here may vary based on
the cable used. The power measurements reported here are only for reference purposes.
Avaya Powered Device
4601SW
4602SW
4610SW
4621SW
4622SW
4625SW
9610
9620
9630
9630 with SBM24
9640
9650
1603 with PoE Splitter
1608
1616
1616 with BM32
Quick Edition 4610SW
Quick Edition 4621SW
Quick Edition G10 PSTN gateway
* The Avaya one-X Value Edition 1603 IP Telephone with PoE Splitter is a Class 2 Powered
Device. It was observed that the Nortel 5520-24T-PWR was not able to properly detect its class.
The switch reported different classes for the device, but showed power measurements in the
expected range, and was able to properly provide power to the device. The class for all other
devices was properly detected. It should be noted that the Avaya one-X Value Edition 1603 IP
Telephone with PoE Splitter has been tested with other PoE switches and its class was properly
detected.
6. Verification Steps
The following commands can be used with the Nortel 5520-24T-PWR to display the device class
detected and power provided.
JPA; Reviewed:
SPOC 8/6/2007
Table 1: Power Measurements
Solution & Interoperability Test Lab Application Notes
©2007 Avaya Inc. All Rights Reserved.
802.3af
Measured
Class
Power (W)
2
2.9
2
3.1
2
3.7
2
4.8
2
4.8
3
7.9
2
4.2
2
4.6
2
4.8
2
5.3
2
3.9
2
4.8
2*
4.0
2
4.0
3
5.6
3
6.0
2
3.2
2
4.9
0
4.3
(Idle)
6 of 8
Nortel5520PoE.doc
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