How many groups CTCSS?

CTCSS divided into analog CTCSS and digital CTCSS, analog CTCSS have 38 groups, digital CTCSS have 83 groups, why we need know the CTCSS quantity? For example,make adult radio talk with Retevis children’s radio

 

1.99 Groups CTCSS: 38 Groups analog CTCSS+61 Groups digital CTCSS

 

2.121 Groups CTCSS: 38 Groups analog CTCSS+83 Groups digital CTCSS

 

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