Areca ARC-1882LP User Manual download pdf (Page 26)

HARDWARE INSTALLATION

Step 7. Install the LED Cable (option)

The preferred I/O connector for server backplanes is the inter-

nal SFF-8087 connector. This connector has eight signal pins to

support four SAS/SATA drives and six pins for the SGPIO (Serial

General Purpose Input/Output) side-band signals. The SGPIO bus

is used for efcient LED management and for sensing drive Locate

status. See SFF 8485 for the specication of the SGPIO bus. For

backplane without SGPIO supporting, Please refer to Section 2.4

LED cables for fault/activity LED cable installation.

LED Management: The backplane may contain LEDs to indicate

drive status. Light from the LEDs could be transmitted to the out-

side of the server by using light pipes mounted on the SAS drive

tray. A small microcontroller on the backplane, connected via the

SGPIO bus to a 6Gb/s SAS RAID controller, could control the LEDs.

Activity: blinking 5 times/second and Fault: solid illuminated

Drive Locate Circuitry: The location of a drive may be detected by

sensing the voltage level of one of the pre-charge pins before and

after a drive is installed.

The following signals dene the SGPIO assignments for the Min

SAS 4i internal connector (SFF-8087) in the 6Gb/s SAS RAID con-

troller.

PIN Description PIN Description

SideBand0 SClock (Clock signal) SideBand1 SLoad (Last clock of a bit

stream)

SideBand2 Ground SideBand3 Ground

SideBand4 SDataOut (Serial data

output bit stream)

SideBand5 SDataIn (Serial data input bit

stream)

SideBand6 Reserved SideBand7 Reserved

The SFF-8087 to 4 SATA with sideband cable which follows

SFF-8448 specication. The SFF-8448 sideband signals cable

is reserved for the backplane with header on it.The following

signal denes the sideband connector which can work with Areca

sideband cable on its SFF-8087 to 4 SATA cable.

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Areca ARC-1882LP User Manual Page 26