User guide

Table Of Contents
Technician’s Handbook
220
Ext Mov Ext N/A Call Rings first Extension
Cyclic Ring Timer Expires; Call moves to First
member of moving group.
Cyclic Ring Timer Expires; Call moves to
Next element in the moving group This
repeats until the last element in the group is
found.
Cyclic Ring Timer Expires; Call rings All
members of the Group
Cyclic Ring Timer Expires; Call rings second
extension
Cyclic Ring Timer Expires; Call Rings
attendant (backstop).
Mov Ext Mov N/A Call rings first element of first moving group
Cyclic Ring Timer Expires; Call moves to
Next element in the moving group This
repeats until the last element in the group is
found.
Cyclic Ring Timer Expires; Call Rings All
members of Group
Cyclic Ring Timer Expires; Call moves to
Extension
Cyclic Ring Timer Expires; Call moves to first
element of second moving group.
Cyclic Ring Timer Expires; Call moves to
Next element in the moving group This
repeats until the last element in the group is
found.
Cyclic Ring Timer Expires; Call Rings All
members of Group
Cyclic Ring Timer Expires; Call Rings
attendant (backstop).
Table 23: Cyclic ring map operation (continued)
Cyclic ring map operation for
DID (NA) and non-DDI only lines (UK)
Entry 1 Entry 2 Entry 3 Overflow Call progression
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