Sonnet Technologies Echo Express SE II - Manual (Page 13)

Chapter 5 – Tips, General Information, and Known Issues
KNOWN ISSUES
Not all PCIe Cards Will Perform at 100%
Thunderbolt’s PCIe bandwidth is limited to 10Gbps. While many
cards will operate at full performance, some may not due to the
fact they require more bandwidth than Thunderbolt is capable of
delivering.
OS X Updates May Break Compatibility
Specific device drivers that work under one version of OS X
may not work under a later version. Before updating to the
latest OS, we recommend that you contact your PCIe card’s
manufacturer to verify that the existing drivers work. Note
that other software updates for the computer may also break
compatibility.
Some Devices’ Performance May be Affected by Where They
Are Connected in a Thunderbolt Chain
However small, Thunderbolt introduces latency to a device chain.
If you expand with additional Thunderbolt expansion chassis,
you may need to experiment with which cards work better in
chassis closer to or farther from the computer in the chain.
PCIe CARDS ARE NOT HOT-PLUGGABLE!
Never install a PCIe card into Echo Express SE II while it is
connected to a computer or power outlet! If you do, you risk
injury, and damage to the card, chassis, and computer.
TIPS, GENERAL INFORMATION
Keeping the Cards Cool
With its optimized airflow design and temperature-controlled
fan providing cooling at all times, Echo Express SE II provides
adequate cooling for the installed cards. Do not operate the Echo
Express SE II with its cover off, and do not block any of the vents!
Otherwise, the cards and chassis’ components may overheat.
Hot Plugging the Echo Express SE II Expansion Chassis
When a certified Thunderbolt-compatible card (used with
Thunderbolt-compatible drivers) is installed in the Echo Express
SE II, you may connect and disconnect the chassis while the
computer is on. Of course, if you have anything connected to
the card, such as storage devices, cameras, etc., follow proper
procedures for disconnecting those devices before unplugging the
Echo Express SE II chassis.
There’s No Power Switch and No Need to Unplug the Power
Adapter
Because the Echo Express SE II automatically powers on and off
with the computer to which it’s connected, there’s no power
switch, nor is there any need to disconnect the power cable
under normal use.
Power Indicator Operation
Because the Echo Express SE II chassis automatically powers on
and off with the computer to which it’s connected, its power
indicator only lights when the computer is on, and turns off
when the computer is sleeping or powered off. Note that the
power adapter’s power indicator remains lit as long as it is
connected to a live power outlet.
Connecting Additional Thunderbolt Devices
You may connect up to six Thunderbolt devices total in a daisy
chain, including the Apple Thunderbolt Display.
Using Expansion Cards Without Drivers
Some Thunderbolt-compatible expansion cards, like Sonnet’s
Allegro
™ FW800 PCIe FireWire ® adapter and Sonnet’s Tempo ™
SATA Pro 6Gb eSATA cards, use drivers built into the OS.
Some PCIe Cards May Not Fit in Echo Express SE II
Cards installed into Echo Express SE II must be no more than
7.75" (16.76 cm) long.
Adding or Replacing a Card
Shut down the computer, and then disconnect the power adapter
and Thunderbolt cables from the Echo Express SE II before
disassembling the chassis and installing or replacing a card.
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