Инструкция для ZYXEL GS1920-48

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Chapter 3 Hardware Panels

GS1920 Series User’s Guide

Four 1000Base-T Ethernet ports are paired with a mini-GBIC slot to create a dual personality
interface. The Switch uses up to one connection for each mini-GBIC and 1000Base-T Ethernet pair.
The mini-GBIC slots have priority over the Gigabit ports. This means that if a mini-GBIC slot and
the corresponding GbE port are connected at the same time, the GbE port will be disabled.

Note: The dual personality ports change to fiber mode directly when inserting the fiber

module.

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, 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 Switch 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 Mini-GBIC Slots

These are slots for mini-GBIC (Gigabit Interface Converter) transceivers. A transceiver is a single
unit that houses a transmitter and a receiver. The Switch does not come with transceivers. You
must use transceivers that comply with the Small Form-factor Pluggable (SFP) Transceiver
MultiSource Agreement (MSA). See the SFF committee’s INF-8074i specification Rev 1.0 for details.

You can change transceivers while the Switch is operating. You can use different transceivers to
connect to Ethernet switches with different types of fiber-optic or even copper cable connectors.

To avoid possible eye injury, do not look into an operating fiber-optic
module’s connectors.

• Type: SFP connection interface
• Connection speed: 1 Gigabit per second (Gbps)

3.1.2.1 Transceiver Installation

Use the following steps to install a mini-GBIC transceiver (SFP module).