DPT Overview 1-131.1 ConfigurationLine Access ButtonsThe following three types of CO button must be used to seize a CO line when making a call.• Group-CO (G-CO) button• Loop-CO (L-CO) button• Single-CO (S-CO) buttonConditions• A flexible CO button can be assigned as a Line Access Button (G-CO, L-CO or S-CO) ineither System/Station Programming. Once a flexible CO button is assigned as a LineAccess Button, it provides a line status condition in the form of a lighting pattern and colorindication. Please refer to “Indication Patterns” in this section and “LED Indication” in theAppendix (Section 8).• It is possible to have multiple appearances of the same G-CO or L-CO buttons on the sametelephone. Incoming and outgoing calls on the line are shown on the button in thefollowing priority.S-CO > G-CO > L-COGroup-CO (G-CO) buttonTo support efficient utilization of CO lines, a group of CO lines (CO line group) can beassigned to a CO button. This button is referred to as Group-CO (G-CO) button. Anyincoming calls from any CO line in the CO line group arrive at the G-CO button. To make aCO call, you can access an idle CO line in the group by simply pressing the assigned G-CObutton.Conditions• It is possible to assign the same line to an S-CO button, a G-CO button, and an L-CObutton.• It is needed to program the extension for making and/or receiving calls on CO line groups.• When your extension is assigned as an incoming call destination for a CO line, you cannotreceive any incoming CO calls unless a G-CO, L-CO or S-CO button associated with theline is assigned.Programming References• Station Programming (Section 2)Flexible Button Assignment — Group-CO (G-CO) Button(System Programming — [005] (Installation Manual) can be used for this assignment.)Feature ReferencesFlexible Buttons (Section 1.1/Configuration)Outward Dialing, Line Access — Line Access, CO Line Group
