Poe (Gs1920-8Hpv2 & Gs1920-24Hpv2 & Gs1920-48Hpv2); Sfp Slots - ZyXEL Communications GS1920v2 Series User Manual

An auto-crossover (auto-MDI/MDI-X) port automatically works with a straight-through or crossover
Ethernet cable.
Four 1000Base-T Ethernet ports are paired with an SFP slot to create a dual personality interface. The
Switch uses up to one connection for each SFP and 1000Base-T Ethernet pair. The SFP slots have priority
over the Gigabit ports. This means that if an SFP 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 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 Switch 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 (G S1920- 8HPv2 & G S1920- 24HPv2 & G S1920- 48HPv2)
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 via its Ethernet ports. Each device that receives power through an Ethernet port is a
Powered Device (PD).
3.1.3 SFP Slo ts
These are slots for SFP (Small Form-Factor Pluggable) 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.
Chapter 3 Hardware Panels
GS1920v2 Series User's Guide
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