Why is it recommended to put ActivChassis Backup in middle of stack?

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Adtran recommends that the ActivChassis Backup switch be located generally in the middle of the stack.  So in a seven switch stack about the fourth or fifth switch.  I have an existing numbering scheme for my switches that, without buying a bunch of two meter stacking cables, I can't match with VCID numbers.

If this is an important consideration I'll live with it, but nowhere can I find why they recommend that.  I'm converting nine 1638s to ActivChassis stacks and need a little guidance on this.

Thanks for your help.

Keith

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[Anonymous]

I believe this is recommended only for the reasons of fault tolerance.  The fewer connections between a controller and a slave switch switch, the more likely the switch can fail-over or recover to the backup.

This is even more the case when the AC is not all in the same rack or location, since the chances of a cut to an AC XIM connection are higher.