DMO Parameters 3-75
September 2008
Chapter 3 - MTM800 Product Information Manual 6866537D87-F
19.6.1 Key Grouping Method
Stores the key group method currently in use.
The notation <K,E> means that out of the 30 static cipher keys (SCKs) stored in the MS, SCK1-
SCK-K*E are usable. The SCKs are split to K key-groups, each with E key-editions. Key-groups are
labelled KG1 to KG-K, and KGj is composed of SCKs j, j+K, j+2K, ..., j+(E-1)*K.
The possible 10 values are: <30K,1E> <15K,2E> <10K,3E> <7K,4E> <6K,5E> <5K,6E> <4K,7E>
<3K,10E> <2K,15E> <1K,30E>.
19.6.2 Default Key Group
This the default Key Group which applies for Individual communications. When key grouping
method is <K, E>, the available values that can be selected are one of KGj(j=1 ... K) or NO_KG.
19.6.3 Default Incoming Minimum Security Class
This is an additional parameter to DMO talkgroups. It is the default minimum security class for calls
and SDS messages reception. It applies to individually addressed communications as well as group
addressed communications that are not covered in Incoming Minimum Security Class.
• Security Class 1 - no encryption applied.
• Security Class 2A - the DM-SDU and any related traffic are AI encrypted.
• Security Class 2B - the destination address (SSI), DM-SDU and any related traffic are AI
encrypted.
• Security Class 2C - PDU encrypted from destination address element and onwards except for
source address type element, and any related traffic are AI encrypted.
To change the setting, select the field value, and select desired setting.
Note: The Default Incoming Minimum Security Class cannot be set higher than the Default
Outgoing Security Class.
19.6.4 Default Outgoing Security Class
This is an additional parameter to DMO talkgroups. It is the default security class for calls and
sending SDS messages initiation. It applies to individually addressed destinations as well as group
addressed destinations that are not covered in Outgoing Security Class.
The security classes are the same as for Default Incoming Minimum Security Class.
To change the setting, select the field value, and select desired setting.
Note: The Default Outgoing Security Class cannot be set lower than the Default Incoming Minimum
Security Class.
19.6.5 Gateway Capabilities Class 2A - 2C
Click to activate/deactivate Boolean flag indicating if the radio shall assume that the relevant
security class is supported by the gateway(s) in operation, or not supported by them.
19.6.6 Repeater Capabilities Class 2A - 2C
Click to activate/deactivate Boolean flag indicating if the radio shall assume that the relevant
security class is supported by the repeater(s) in operation, or not supported by them.
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