©
National Instruments Corporation
13
HDD-8263/8264 Installation Guide
The link between the PC and the chassis is a x4 PCI Express link. This link
is a dual-simplex communication channel comprised of low-voltage,
differentially driven signal pairs. The link can transmit at a rate of 10 Gbps
in each direction simultaneously in x4 mode.
Figure 1.
Block Diagram of an HDD-826
x
System
LED Indicators
The LEDs on HDD-826
x
cards give status information about power
supplies and link state. The back of the HDD-826
x
has two LEDs,
one for power supply status and one for link state.
Table 1 describes the meaning of the LEDs on the back of the HDD-826
x
.
Each hard drive on the front of the HDD-826
x
has two LED indicators.
Table 2 describes meaning of the LEDs on the front of the hard drives.
Table 1.
NI HDD-826
x
Back Panel Status LED Messages
LED
Color
Meaning
LINK
Off
Link not established
Green
Link established
PWR
Off
Power off
Green
Power on
Table 2.
NI HDD-826
x
Hard Drive Status LED Messages
LED
Color
Meaning
PWR
Off
Drive not available or
powered off
Blue
Drive powered on
ACTIVITY
Off
No read or write activity
Blue
Read or write in process
Host
PC
PCI Express
Re-Driver
PCI Express
RAID Card
PCI Express
Cable
SATA
Drive 1
PCI Express
Re-Driver
SATA
Drive 2
SATA
Drive 3
SATA
Drive
n
