The MSC is made up of Common Interleaved Frames (CIFs), which is the serial digital output from the main service multiplexer, contained in the Main Service Channel part of the transmission frame.
CIF is common to all transmission modes and contains 55 296 bits, for example 864 CUs.
In the tree view, click on , and a Figure will appear below the parameter table.
If more service components are needed, there are two methods to create a new service component.
Method 1: Click on in the tree view, and in
the configuration box below, click on 
, and select
Method 1 creates or deletes service components that haven't associated with certain service yet. Notice that the CIF structure won't change after adding a new service component following the method 1, since the service component hasn't been allocated to any service yet.
Method 2: Click on in
the tree view, and in the configuration
box below, click on , and select
A will be
created as follows, also you can delete them using the 
button.
CIF structure will change as follows:
There is a allocated in the CIF structure.
With method 2, you have to be clear which service to edit before adding or deleting any service components.