600-2705 PCI Express Expansion System User’s Manual
4-1
Revision 1.0, February 2008
CHAPTER 4
SYSTEM POWER UP
4.1
SYSTEM POWER UP
The host PC with an installed PCIe-409 controls power-up for the entire system. The PCI Express cable
should be connected between the PCIe-409 and the PCIe-414 and the 600-2705 power cord should be
connected to the chassis and plugged in to a power socket. There is a power button on the front of the
600-2705 Expansion Chassis. However, it is not connected and serves no practical purpose in this appli-
cation. When the host PC is powered on, a signal is sent over the PCI Express cable to turn on the 600-
2705. If the chassis does not power up, make sure that all cards are seated properly, the chassis is
plugged in and the PCI Express cable is connected properly. There is only one LED on the front of the
expansion chassis that has meaning. The green LED indicates that the chassis is powered.
4.2
SEATING OF CARDS
Unlike standard PC applications, the 2705 Expansion Systems has a narrow lower gate that precisely
engages the lower end of the PCI Express Add-In board’s face panel. The purpose is to insure correct
electrical connectoring mating of up-plugged boards. Failure to accurately mate the lower end of the
face panel with the chassis, lower gate will lead to the board not being recognized by the host.
4.3
LINK INDICATION - LED DEFINITION PCIE-409
The top (or right) LED on the front panel is the "Cable Power On" LED. This LED reflects the status of
the "CPWRON" signal in the PCIe Expansion Cable. When the LED is ON, it is indicating that the
"CPWRON" signal is asserted. The PCIe-409 asserts "CPWRON" to turn the expansion chassis ON. If
this LED is OFF, there may be a problem with +3.3V power in the host system or the PCIe-409 is not
inserted properly in it’s slot.
The bottom (or left) LED on the front panel is the "Cable Present Detect" LED. This LED reflects the
status of the "CPRSNT#" signal in the PCIe Expansion Cable. When the LED is ON, it is indicating that
the "CPRSNT#" signal is asserted. The expansion chassis asserts "CPRSNT#" to indicate that it is
present, the cable is connected and power is good. If this LED is OFF, there may be a problem with
+3.3V power in the expansion chassis or the PCIe Expansion Cable is not connected properly.
4.3.1
Down-Shifting the PCIe-409
Down-shifting the PCIe-409 does not work. Be sure the PCIe-409 is plugged into a fully routed x8
connector in the host system. The expansion chassis may not establish link if the PCIe-409 is plugged
into a x8 connector that is only routed as a x4 slot.
This is of special concern when using Apple’s Computers where the lane assignments are program-
mable. The PCIe-409 requires a x8 lane assignment.
