Users Guide

Hardware Overview 139
The Dell EMC Networking N3048ET-ON/N3048EP-ON front panel provides
48 Gigabit Ethernet (10BASE-T, 100BASE-TX, 1000BASE-T) RJ-45 ports that
support auto-negotiation for speed, flow control, and duplex. The Dell EMC
Networking N3048ET-ON/N3048P-ON support two SFP+ 10G ports. Dell
EMC-qualified SFP+ transceivers are sold separately.
The front-panel switch ports have the following characteristics:
• The switch automatically detects the difference between crossed and
straight-through cables on RJ-45 ports and automatically chooses the MDI
or MDIX configuration to match the other end.
• SFP+ ports support Dell EMC-qualified transceivers. The default
behavior is to log a message and generate an SNMP trap on insertion or
removal of an optic that is not qualified by Dell. The message and trap can
be suppressed by using the service unsupported-transceiver command.
• RJ-45 ports support full-duplex mode 10/100/1000 Mbps speeds on
standard Category 5 UTP cable.
• SFP ports support 1000BASE-X and 100BASE-X (100BASE-FX/100BASE-
LX/100BASE-SX) transceivers. SFP ports with 1000BASE-X transceivers
require auto-negotiation to be enabled but also allow configuration of
forced speeds with auto-negotiation disabled. However, the SFP ports do
not support auto-negotiation for 100BASE-X transceivers. When the
switch detects a 100BASE-X transceiver, it resets the port to use 4B/5B
NRZI line coding from the default 8B/10B NRZ coding. This causes the
link to flap momentarily. The flap may be observed at the link partner
upon insertion of an SFP transceiver and on switch reboot. Administrators
should ensure that the link partner is set to accept a single link flap on
100BASE-X interfaces.
• SFP+ ports support SFP+ transceivers and SFP+ copper twin-ax
technology operating at 10G/1G speeds in full-duplex mode. SFP
transceivers are supported in SFP+ ports and operate at 1G full-duplex.
SFP transceivers in an SFP+ port require auto-negotiation to be enabled
per the IEEE 802.3 standard but may be configured to use a forced speed
with auto-negotiation disabled.
• The Dell EMC Networking N3024P/N3048P/N3048ET-ON/N3048EP-ON
front-panel ports support PoE (15.4W) and PoE+ (34.2W) as well as
legacy capacitive detection for pre-standard PDs.