Cisco TelePresence System TX9000 Assembly, Use & Care, And Field-Replaceable Unit Manual page 221

Chapter 12 Building the Second Row Table (TX9200 Systems Only)
Make sure that the first and second row tables are the same height by completing the following steps:
Step 17
a.
b.
Figure 12-10 Aligning the First and Second Row Tables
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Set up a laser level behind the second row.
Align the top of the table legs with the bottom of the wooden tabletops on the first row.
Cisco TelePresence System TX9000 and TX9200 Assembly, Use & Care, and Field-Replaceable Unit Guide
Assembling the Second Row Table
12-11