Maintaining the DS-4900B
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Operating the DS-4900B
Maintaining the DS-4900B
The DS-4900B is designed for high availability and low failure; it does
not require any regular physical maintenance. It includes diagnostic
tests and field-replaceable units, described in the following sections.
Diagnostic tests
In addition to POST, Fabric OS includes diagnostic tests to help you
troubleshoot the hardware and firmware. This includes tests of
internal connections and circuitry, fixed media, and the transceivers
and cables in use. The tests are implemented by command, either
through a telnet session or through a console set up to the serial
connection to the switch. Some tests require the ports to be connected
by external cables, to allow diagnostics to verify the
serializer/deserializer interface, transceiver, and cable. Some tests
require loopback plugs.
Diagnostic tests run at link speeds of 1-, 2-, and 4-Gb/s. Diagnostic
tests might temporarily lock the transmit and receive speed of the
links during diagnostic testing. For information about specific
diagnostic tests, see the Fabric OS Command Reference Manual.
Field replaceable units (FRUs)
You can replace the power supplies and fan assemblies onsite
without the use of special tools. The power supplies and fan
assemblies are keyed to ensure correct orientation during installation.
Installation instructions are provided with all replacement units.
WARNING
The DS-4900B has two power cords. To remove all power from the
switch, disconnect both power cords before servicing.
Power supplies The two power supplies are hot-swappable. They are identical and fit
into either power supply slot.
Fabric OS identifies the power supplies as follows (viewing the
switch from the nonport side):
◆ Power supply 1 on the right
◆ Power supply 2 on the left
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