Poe; Combo Port - ZyXEL Communications NSW Series User Manual

The NSW has 1000Base-T auto-negotiating, auto-crossover Ethernet ports. In 10/100/1000 Mbps Gigabit
Ethernet, the speed can be 10 Mbps, 100 Mbps or 1000 Mbps. The duplex mode can be half duplex or
full duplex.
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 De fa ult Ethe rne t Ne g o tia tio n Se tting s
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 - c ro sso ve r
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 Po E
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 C o m b o Po rt
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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