ZyXEL Communications IES-5106M User Manual page 27

Note: The MSC has more connector pins than the other cards so you need to exert
more force to get the MSC all the way in and properly seated in the backplane.
Make sure the front panel of the MSC is touching the front panel of the chassis.
The MSC must be installed properly in order for you to be able to tighten the
thumbscrews.
Tighten the two thumbscrews.
5
Figure 18 Installing a Card
IES-5106M / IES-5112M / IES-6000M User's Guide
Chapter 2 Hardware Installation and Connections
27