JDSU NT850 Betriebsanweisung PDF herunterladen (Seite 53)

Chapter 3 Performing Network Tests

Performing PoE Tests

LanScaperPRO Network Tester User’s Guide 37

2 Access the Network Test Menu. (See “Accessing the

Network Test Menu” on page 22.)

3 Scroll through the menu options using the arrow keys

until PoE Test is highlighted.

4 Press the SEL key.

The PoE Test screen appears.

Figure 15 The PoE Test screen

5 Press the TEST key to begin the test.

The test first looks for the presence of voltages on

the connector pins. (See “Notes About Voltage

Checking” on page 20.) If voltages are found in

typical telephone or ISDN locations, the LanScap-

erPRO reports that it may be connected to a phone

or ISDN line. In this mode, the unit also tests for a

legacy PoE mode known as "PoE Homebrew" power.

This is raw DC power that may be connected to the

center taps of the Ethernet transformers and thus

appear on the 1-2, 3-6 pairs, or the 4-5, 7-8 pairs.

This type of power was designed into systems prior

to the introduction of the IEEE 802.3af specification.

The LanScaperPRO detects and reports this voltage

and then can continue to test for active Ethernet.

LanScaperPRO_User_Guide.book Page 37 Friday, January 25, 2008 1:14 PM

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JDSU NT850 Betriebsanweisung Seite 53