Chapter 3 Hardware Panels
XGS1930 Series User’s Guide
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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 PoE (XGS1930-28HP & 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 via 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/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-
optic 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-optic connectors.
• Type: SFP or SFP+ connection interface
• Connection speed: 1 or 10 Gigabit per second (Gbps)
To avoid possible eye injury, do not look into an operating fiber-optic
module’s connectors.
3.1.3.1 Transceiver Installation
Use the following steps to install an SFP/SFP+ transceiver.
1
Locate the transmit (Tx) and the receive (Rx) markings on the SFP+ module to identify the top.
2
Insert the transceiver into the slot.