Chapter 3 Hardware Panels
XGS1930 Series User’s Guide
32
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 (XGS1930-28HP and XGS1930-52HP)
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).
3.1.3 SFP/SFP+ Slots
These are four slots for Small Form-Factor Pluggable (SFP) or SFP+ modules, such as an SFP or SFP+
transceiver. The SFP+ (SFP Plus) is an enhanced version of the SFP and supports data rates of 10 Gbps. A
transceiver is a single unit that houses a transmitter and a receiver. Use a transceiver to connect a fiber
cable to the Switch. 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 connectors.
• Type: SFP or SFP+ connection interface
• Connection speed: 1 or 10 Gigabit per second (Gbps)
WARNING! To avoid possible eye injury, do not look into an operating
fiber module’s connectors.
HANDLING! All transceivers are static sensitive. To prevent damage from
electrostatic discharge (ESD), it is recommended you attach an ESD
preventive wrist strap to your wrist and to a bare metal surface when
Summary of Contents for XGS1930-28HP
Page 19: ...19 PART I User s Guide...
Page 39: ...39 PART II Technical Reference...
