3
dc2583af
DEMO MANUAL DC2583A
Quick start proceDure
Power Over Ethernet (PoE) Input
1. Disconnect auxiliary supply if it is connected to AUX+
and AUX– inputs of the DC2583A.
2. Refer to Figure 3 to evaluate the DC2583A with a
DC/DC converter. If a resistive or an active load is
used to evaluate the DC2583A, use the setup diagram
as shown in Figure 4.
3. Default class shunt positions are at JP1 and JP2 on
the DC2583A board. Choose a power level from Table
1 and select the corresponding shunt positions.
Table 1. Single-Signature Classification Codes, Power
Levels and Jumper Selection
PD CLASS
ALLOCATED CLASS
POWER AT THE PD INPUT
RCLASS JUMPERS
0*
13W
JP1
JP2
1
3.84W
JP3
JP4
2
6.49W
JP5
JP6
3
13W
JP7
JP8
4
25.5W
JP9
JP10
5
40W
JP11
JP12
6
51W
JP13
JP14
7
62W
JP15
JP16
8
71W
JP17
JP18
*Class 0 is not defined for 802.3bt PDs.
4. Connect the output of the IEEE 802.3bt compliant PSE
(see note) to the RJ45 connector (J1) of the DC2583A
using a CAT5e or CAT6 Ethernet cable.
5. After connection has been established, verify that the
LED (D3) is lit. This indicates the PSE has successfully
detected and powered the PD.
6. Verify
T2P
response with a digital multimeter or an
oscilloscope. The
T2P
response for the type of PSE
connected to the DC2583A is provided in Table 2.
Note: An 802.3bt PSE has not yet been released. In
the interim, an LTPoE++
®
compliant PSE (DC1814A-D)
may be used to provide power to the DC2583A. The
LTPoE++ classification will not be 802.3bt compli-
ant, but the PSE will provide a compatible detection
and power output. Specifically, the
T2P
output of
the DC2583A is different from the behavior stated in
Table 2 and will indicate connection to a Type 2 PSE.
Otherwise PD behavior will be unaffected.
Table 2.
T2P
Response
PSE
T2P
RESPONSE
NEGOTIATED PD
INPUT POWER
IEEE
Logic High
13W
Logic Low
25.5W
50% Logic High/50% Logic Low,
Toggle at 840Hz (typical)
51W
75% Logic High/25% Logic Low,
Toggle at 840Hz (typical)
71W
LTPoE++, 90W
Logic Low
71W
