User guide

Hardware Installation
890 USE 108 00 August 2001 121
Installing a BXT 203 Cable in a Stacked Drop Layout
Overview of the
BXT 203 Cable
If you are installing a stacked configuration, two rows of backplanes installed one
over the other on two parallel DIN rails, you may connect the last (rightmost)
backplane in the top row to the first (leftmost) backplane in the bottom row using a
BXT 203 bus
This cable is 700 mm (27.5 in) long; it may be run either from rack 1 in the top row
to rack 2 in the bottom row or from rack 2 in the top row to rack 3 in the bottom row
or from rack 1 in the top row to rack 2 in the bottom row. (See Using a BXT 203 Cable
(30-Pin Female-to-Male Connectors), p. 111.) A stacked installation may use DTA
201 secondary backplanes in conjunction with a DTA 200 primary backplane; DTA
202 secondary backplanes cannot be used.
Both ends of the BXT 203 cable are 30-receptacle bus connectors that mate with the
30-pin connectors on the right side of one backplane to the left side of the other
backplane. A ground strap on each end of the cable should also be connected to the
system reference connectors on the two backplanes.
This shows the ground strap connection.