CHAPTER 2: PRODUCT DESCRIPTION PRODUCT DESCRIPTION
MULTILINK ML3000 ETHERNET COMMUNICATIONS SWITCH – INSTRUCTION MANUAL 2–9
2.3.4 Redundant Power Supply
With the redundant power supply, the ML3000 can receive power from either power supply
1 (A) or power supply 2 (B). The switch load is shared if both power supplies are available.
The unit will not allow power to flow from a one input to another input (i.e. the two power
sources are not mixed together by the switch).
When one power supply is present, the ML3000 will receive power even if the other power
supply is absent, or if it is connected with reverse polarity, shorted, or grounded.
If reverse polarity connections should accidentally occur on either input, they will not
damage the ML3000 or power supply (nor will it blow the fuse in the internal power supply)
because of the blocking action of the diodes. This is true even if one input connection is
reversed while the Switch is operating from the other source.
The ML3000 will not receive power (and will not work) when both inputs are simultaneously
absent.
The status of the power supplies can be queried with the
show power command.
show power
Power supply 1 on the switch is power input A and power supply 2 on the switch is power
input B. For example,
ML3000# show power
Power Input A Good.
Power Input B Good.
The show powercommand is only available in switches with redundant power supplies.
2.3.5 Additional Features and Benefits
• IEEE 1588 Precision Timing Synchronization: The ML3000 offers high precision
IEEE 1588v2 timing Synchronization, with precision as low as single-digit
nanoseconds.
• Managed switching for high performance Ethernet LANs: ML3000 Switches
provide non-blocking (all ports can run at full speed at once) performance with
standard Managed Network Software.
• Switching services includes 802.1p QoS packet prioritization: The ML3000
switching hardware supports QoS, giving packet processing priority to priority
tagged packets according to the IEEE 802.1p 4-level standard. For port-specific
and application-specific priorities of data, including VLANs, the QoS software may
be configured by the user.
• Fiber Port configurability: ML3000 Managed Switches are designed to naturally
include fiber ports, and support mixes of multi-mode, single-mode, 10 Mb and
100 Mb and 1000 Mb speed; full-duplex and half-duplex; classic FX Small Form
Factor (SFF) and Small Form Pluggable (SFP) connectors for fiber cable.
• Relay Contacts for monitoring internal power and user-defined software
events: Two Alarm Relay contacts monitor basic operations. One is for hardware,
and will signal loss of power internally. The other is software controlled and will
signal user-defined software events such as a security violation or a redundancy
fault condition.
• 19” Rack-mounting: The standard rack mounting provides Ethernet ports and
status LEDs in front, service connections (power input and management console)
in the rear. “Reverse” rack mounting provides status LEDs in front and all cabling
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