User guide

Hardware Planning
890 USE 108 00 August 2001 105
Two-Slot and
Five-Slot
Secondary
Backplanes
Up to three secondary backplanes may be used in a drop (a drop maximum of four,
one primary and three secondary). Secondary (or extension) backplanes may be
mounted to the right of the DTA 200 primary backplane on a common DIN rail or
beneath the DTA 200 on one other DIN rail. The secondary backplanes contain
either two (the DTA 202) or five (the DTA 201) 30-receptacle connectors for I/O
module insertion. Secondary backplanes contain a bus extension ribbon cable with
a 30-receptacle connector on it, allowing backplanes to be interlocked along a
common DIN rail via a ground extension strap.
This shows the DTA 201 and 202 secondary backplanes.
The DTA 201 five-slot backplane is 213.4 mm wide x 142 mm high x 31 mm deep.
It has a 30-pin bus extension connector on its right side, allowing you to add another
extension backplane to the drop. As many as three DTA 201 backplanes may be
used in a drop, and they may be used in either a linear drop layout (along one
common DIN rail) or in a stacked drop layout (two DIN rails, one over the other).
The DTA 202 two-slot backplane 91.5 mm wide x 142 mm high x 31 mm deep. Its
backplane does not have a bus extension connector on its right side, and, if it is
used, it must be the last backplane in the drop. If you plan to use a DTA 202
backplane, remember that only one may be used in the drop, and it may be used
only in a linear drop layout.(That is, not in a stacked drop layout.)