Ethernet And Console Ports - Black Box LWN602A User Manual

Chapter 3: The SmartPath AP (LWN602HA) Overview

3.2 Ethernet and Console Ports

There are three ports on the SmartPath AP: two RJ-45 10/100/1000BASE-T/TX Ethernet ports and an RJ-45 console port. The pin
assignments in the PoE (Power over Ethernet) Ethernet ports follow the TIA/EIA-568-B standard (see Figure 3-3 and Table 3-2).
The ports accept standard types of Ethernet cable—CAT3, CAT5, CAT5e, or CAT6—and can receive power over this cable from
power sourcing equipment (PSE) that is 802.3af-compatible. If you use CAT5, CAT5e, or CAT6 cables, the SmartPath AP can also
support 802.3at-compliant PSE. Such equipment can be embedded in a switch or router, or it can come from purpose-built devic-
es that inject power into the Ethernet line en route to the SmartPath AP. Because the PoE ports have autosensing capabilities, the
wiring termination in the Ethernet cable can be either straight-through or cross-over.
8 1
ETH0
Figure 3-3. View of the ETH0
PoE port on the SmartPath AP
(LWN602HA).
The PoE ports are autosensing and can automatically adjust to transmit and receive data over straight-through or crossover
Ethernet connections. Likewise, they can automatically adjust to 802.3af Alternative A and B power delivery methods.
Furthermore, when the Alternative A method is used, the ports automatically allow for polarity reversals depending on their role
as either MDI or MDI-X. In 802.3at, the 1/2 and 3/6 wire pairs connect to DC source 1 and 4/5 and 7/8 pairs to DC source 2 in
PSE. Although the exact polarity depends on the PSE design, the SmartPath AP Ethernet ports can support all possible options.
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Table 3-2. PoE wire usage and pin assignments.
802.3af Alternative
A (Data and Power
on the Same Wires)
Pin Data Signal MDI
1 Transmit + DC+
2 Transmit - DC+
3 Receive + DC-
4 Not used —
5 Not used —
6 Receive - DC-
7 Not used —
8 Not used —
MDI = Medium-dependent interface for straight-through connections.
MDI-X = Medium-dependent interface for crossover connections
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802.3af Alternative B
(Data and Power on
Separate Wires) 802.3at Wiring Options
MDI-X MDI or MDI-X 1
DC- — DC1+
DC- — DC1+
DC+ — DC1-
— DC+ DC2+
— DC+ DC2+
DC+ — DC1-
— DC- DC2-
— DC- DC2-
2 3 4
DC1- DC1+ DC1-
DC1- DC1+ DC1-
DC1+ DC1- DC1+
DC2+ DC2- DC2-
DC2+ DC2- DC2-
DC1+ DC1- DC1+
DC2- DC2+ DC2+
DC2- DC2+ DC2+