Poe; Combo Port - ZyXEL Communications NSW Series User Manual

An auto-negotiating port can detect and adjust to the optimum Ethernet speed (10/100/1000 Mbps)
and duplex mode (full duplex or half duplex) of the connected device.
An auto-crossover (auto-MDI/MDI-X) port automatically works with a straight-through or crossover
Ethernet cable.
When auto-negotiation is turned on, an Ethernet port negotiates with the peer automatically to
determine the connection speed and duplex mode. If the peer Ethernet port does not support auto-
negotiation or turns off this feature, the NSW determines the connection speed by detecting the signal
on the cable and using half duplex mode. When the NSW's auto-negotiation is turned off, an Ethernet
port uses the pre-configured speed and duplex mode when making a connection, thus requiring you to
make sure that the settings of the peer Ethernet port are the same in order to connect.
3.1.1.1 Default Ethernet Negotiation Settings
The factory default negotiation settings for the Gigabit ports on the NSW are:
• Speed: Auto
• Duplex: Auto
• Flow control: Off
• Link Aggregation: Disabled
3.1.1.2 Auto-crossover
All ports are auto-crossover, that is auto-MDIX ports (Media Dependent Interface Crossover), so you may
use either a straight-through Ethernet cable or crossover Ethernet cable for all Gigabit port connections.
Auto-crossover ports automatically sense whether they need to function as crossover or straight ports, so
crossover cables can connect both computers and switches/hubs.

3.1.2 PoE

The NSW supports both the IEEE 802.3af Power over Ethernet (PoE) and IEEE 802.3at Power over Ethernet
(PoE) plus standards. The NSW is a Power Sourcing Equipment (PSE) because it provides a source of
power via its Ethernet ports. Each device that receives power through an Ethernet port is a Powered
Device (PD).
See Table 1 on page 8

3.1.3 Combo Port

A combo port is for uplink connections. It consists of a Gigabit Ethernet port for Ethernet connection,
and a transceiver slot for fiber connection. The fiber connection takes priority if the corresponding
Gigabit port is also connected.
• 10/100/1000 Mbps Gigabit Ports - Connect these ports to high-bandwidth backbone network
Ethernet switches using 1000BASE-T compatible Category 5/5e/6 copper cables.
• Transceiver Slots - Use SFP in these slots for connections to backbone Ethernet switches.
Chapter 3 Hardware Panels
for detailed information about PoE maximum power of each model.
NSW Series User's Guide
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