I have some Adaptec SAS raid controllers and the fanout cable comes with an extra cable called a SideBand but I am curious what it does?

I know it plugs into the backplane, but other than that I can't seem to find anything on google

The adaptec site refers to it as "SFF-8448 sideband signals" and there is no mention of it in the manuals or their site.


The sideband cables are used to connect the controller to a managed backplane or disk enclosure, so that it can monitor the controller as well as the disks.

  • 2
    That's kind of obvious, I have figured that out. But what specifically does it do? Thanks.
    – Chad Grant
    May 7 '09 at 9:36
  • 2
    It lets the backplane monitor the status of the Raid controller and send alerts should there be a problem. What else do you want to know ? The specifics of how it talks to the controller?
    – Sam Cogan
    May 7 '09 at 9:58

This PDF document "SFF-8448 Specification for SAS Sideband Signal Assignments", (Rev. 05; September 2, 2005) on Seagate's FTP Server defines the signal assignments for known Vendor specific sidebands thata are defined in SAS (Serial Attached SCSI).

On page 12 there is a description of the Sideband Assignments.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.