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Chapter 3 Hardware Panels
XMG1915 Series User’s Guide
39
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 (XMG1915-10EP and XMG1915-18EP)
The Switch supports both the IEEE 802.3af Power over Ethernet (PoE), IEEE 802.3at Power over Ethernet
(PoE) plus, and IEEE 802.3bt Power over Ethernet (PoE) plus 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 two 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
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)
WARNING! To avoid possible eye injury, do not look into an operating
fiber optic 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
you install or remove a transceiver.
STORAGE! All modules are dust sensitive. When not in use, always keep
the dust plug on. Avoid getting dust and other contaminant into the
optical bores, as the optics do not work correctly when obstructed with
dust.
3.1.3.1 Transceiver Installation
Use the following steps to install a transceiver.
1 Attach an ESD preventive wrist strap to your wrist and to a bare metal surface.
2 Align the transceiver in front of the slot opening.
3 Make sure the latch is in the lock position (latch styles vary), then insert the transceiver into the slot with
the exposed section of PCB board facing down.
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