TalkGroups 3-97
September 2008
Chapter 3 - MTM800 Product Information Manual 6866537D87-F
24.2.2.1 Communication Type
This has four options, selectable by first clicking in the field to display the down arrow and then
selecting the down arrow to display the following options:
• Direct - this enables the user to communicate with other terminals operating in Direct Mode
that are on the same frequency and talkgroup as the user.
• Repeater - this enables to support Direct Mode communications over a repeater.
• Gateway - the terminal is able to communicate with its trunking system (and vice-versa) if this
option has been enabled, the system has Gateway connectivity and the terminal is able to
communicate with the Gateway. A Gateway is used to extend the coverage of a cell by
allowing users to move out of the system’s cell coverage area and use the gateway to remain
in contact. Gateways are only used with terminals in DMO.
• Repeater & Gateway - depending on signal received the terminal uses the first available
gateway or a DMO repeater.
24.2.2.2 Gateway Selection
This defaults to ‘None’ unless the Feature Flags/DMO Gateway option is selected, see Paragraph
14.20 "DMO Gateway" and Paragraph 24.2.2.1 "Communication Type"
It has the following 3 options:
• None - The terminal cannot use a Gateway
•Specific - the terminal will use a Gateway with the Gateway Address specified for this
Talkgroup.
• Automatic - the terminal will use any Gateway it can find and to which it can connect.
24.2.2.3 Gateway Address
This is the specific address of the Gateway that the terminal will use, the MNI (Mobile Network
Identity). The Gateways now have standard MCC & MNC codes and to prevent terminals accessing
a different system, a specific address used for an own system gateway is entered in this field.
Note: Generation 1 terminals are not able to set up calls on a gateway, but if called by a terminal of
at least Generation 2 build, the Generation 1 terminals are able to take an active part in the call, i.e.
Tx & Rx.
24.2.2.4 Frequency Channel
This field specifies the frequency to be used for this DMO group, if no frequency is specified, the
group will not be enabled.
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