PEM1305 INFOMART IT SOLUTIONS, PEM1305 Datasheet - Page 2

• Manufacturer Part Number: PEM1305
• Description: 55T6942
• Manufacturer: INFOMART IT SOLUTIONS

Specifications of PEM1305

• Rohs Compliant: YES

FUNCTIONAL DESCRIPTION
www.poweredethernet.com
F.1. Inputs
The PEM1300 is compatible with all IEEE 802.3af compliant Power Sourcing Equipment (PSE) and supports the different power injection options of
Data/Signal pair (Mode A) or Spare Pair (Mode B). See Figure 2 – Typical System Configuration. As per IEEE 802.3af, it is specified that the PSE does not
apply power to the both outputs at the same time i.e. 4 pair injection. (Refer to IEEE802.3af standards for more information).
The PEM1300 provides onboard input bridge rectifiers for improved system integration and minimal external components.
Figure 2 – Typical System Configuration
In Mode A – Signal Pair injection, the signal lines carry both data and power. In Mode B – Spare Pair injection, the Signal pair carries only data, and the spare
pair carries power.
F.2. Powered Device (PD) Signature and Power Classification
When the PEM1300 is connected to a Cat 5e or greater Ethernet cable from an IEEE 802.3af compliant Power Sourcing Equipment (PSE), Endspan or
Midspan, it will automatically present a Powered Device (PD) signature to the PSE, as and when requested. The PSE will then recognise that a PD is
connected to that line and supply power.
With the growing emphasis on “Green Power”, in the latest standard, IEEE has stressed for PDs to implement the IEEE 802.3af Power Classification
system to ensure correct provisioning of power from the PSE. To help in proper power level provisioning and improved power management, the IEEE 802.3af
standard provides for PDs to inform the PSE their required power levels via a Class system. The classes are defined as per Table 1 below. The PEM1300
allows for programming the Class by placing a 1/16W or greater and 1% tolerance resistor detailed in Table 1.
Important :
F.3. Isolation
IEEE802.3af section 33.4.1 calls for a Powered Device (PD) to meet safety isolation requirement by meeting the electrical strength test of IEC 60950 sub
clause 6.2. Infomart’s® PoweredEthernet™ PEM1300 modules meet or exceed 1500V impulse test. This is also referred to as ‘Hi Pot Test’, ‘Flash Tested’,
‘Withstand Voltage’, ‘Proof Voltage’, ‘Dielectric Withstand Voltage’ & ‘Isolation Test Voltage’.
by
IEEE 802.3af COMPLIANT POWER
SOURCING EQUIPMENT (PSE)
Never connect Pin 4 (VINB-) to Pin 5 (CP1). Do not connect Pins 4 (VINB-) and 5 (CP1) and 6 (CP2) at the same time. Connect Pin 5 (CP1) only
to Pin 6 (CP2) and only as per instructions in Table 1. Pin 5 and 6 may be left unconnected for default Class 0 but is not recommended.
(48V)
PSE
Table 1 – Power Classification programming
PoE Power Class
0
1
2
3
4
RX
TX
+/-
+/-
+
-
Reserved for 802.3at
Required PD Power
0.44W ~ 12.95W
6.49W ~ 12.95W
0.44W ~ 3.84W
3.84W ~ 6.49W
2
4
5
1
3
6
7
8
SPARE PAIR
SPARE PAIR
SIGNAL PAIR
SIGNAL PAIR
DATA /
DATA /
PEM1300_11G-R0-8 (DRAFT)
4
5
1
2
3
6
7
8
Pin 4 (VINB –) and Pin 6 (CP2)
POWERED DEVICE (PD)
1/16W or greater and 1% tolerance resistor between
Do not connect
Reserved
90k9kΩ
280kΩ
143kΩ
RX
TX
-
~
~
-
+
~
~
Pin 5 (CP1) and Pin 6 (CP2)
Any value 10KΩ to 100 KΩ
Power Over Ethernet PD Module
+
Do not connect
Do not connect
Do not connect
Reserved
PEM1300 SERIES
PEM1300
+VDC
-VDC
DC
OUTPUT
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