Vision System Manual
189
Matrix
Trunk Access Groups
What’s this?
Trunk Access Groups provide efficient allocation of trunks to different stations.
• All the trunks connected to the system can be bunched in different groups called trunk access group.
• Maximum 4 trunks can be put in one trunk access group and 8 such trunks access groups can be formed.
• These trunk access groups can be allotted to each individual station.
• A station can be allotted different trunk access groups during daytime and nighttime.
• Four trunk access codes viz. 0, 5, 61 and 62 can be used to access these group.
• It is possible to assign trunk access code ‘0’ to a trunk access group containing all the trunks in day time.
Doing so, when a station dials ‘0’ he gets any of the free trunks from trunk access group.
• It is possible to assign same trunk access code ‘0’ to a trunk access group containing no trunk, in night time.
Doing so, when a station dials ‘0’ during night time he gets error tone.
System uses two methods while selecting a trunk from the trunk access group viz. Remember last trunk and
don’t remember last method. In remember last trunk method the system remembers the last trunk used and
allots next trunk in the group to the station. In don’t remember last trunk method, the system searches for a
free trunk from the first trunk programmed in the group. If first trunk is free, it allotted to the station. In such
case it is possible that first few trunks in a group would be used frequently.
How it works?
Following flow chart depicts the chronology of events when a station grabs a trunk.
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