Gigabit Ethernet Ports; Poe (Gs1915-8Ep / Gs1915-24Ep) - ZyXEL Communications GS1915 Series User Manual

Table 5 Panel Connections (continued)
CONNECTOR
Restore
Reset
(only available for
GS1915-24EP)

3.1.1 Gigabit Ethernet Ports

The Switch 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 Switch determines the connection speed by detecting the signal
on the cable and using half duplex mode. When the Switch's auto-negotiation is turned off, an Ethernet
port uses the pre-configured speed and duplex mode when making a connection, thereby 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 Switch are:
• Speed: Auto
• Duplex: Auto
• Flow control: Off
• Link Aggregation: Disabled
3.1.1.2 Auto-crossover
All ports support 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 or hubs.

3.1.2 PoE (GS1915-8EP / GS1915-24EP)

The Switch supports both the IEEE 802.3af Power over Ethernet (PoE) and IEEE 802.3at Power over
Ethernet (PoE) plus standards. The Switch is a Power Sourcing Equipment (PSE) because it provides a
source of power through its Ethernet ports. Each device that receives power through an Ethernet port is
a Powered Device (PD).
Chapter 3 Hardware Panels
DESCRIPTION
Press the RESTORE button for 3 to 6 seconds to have the Switch automatically reboot. See
Section 3.3 on page 37 for more information about the LED behavior.
Press the RESTORE button for more than 6 seconds to have the Switch restore the factory
default file. See Section 3.3 on page 37
Press the RESET button to reboot the Switch without turning the power off. See
page 37 for more information about the LED behavior.
GS1915 Series User's Guide
34
for more information about the LED behavior.
Section 3.3 on