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1.18 Proprietary Telephone (PT) Features
138 Feature Guide
1.18.3 LED Indication
Description
The LED (Light Emitting Diode) of the Message/Ringer Lamp and the following buttons (Line Status Buttons
and Corresponding Extension Status Button) can indicate line status with a variety of light patterns.
Line Status Buttons: Single-CO (S-CO), Group-CO (G-CO), Other-CO (O-CO), INTERCOM
Corresponding Extension Status Button: Direct Station Selection (DSS)
1. Light Pattern of the Message/Ringer Lamp
• Incoming call from an outside (CO) line/another extension: Red flashing
• Message(s) present (no incoming call): Red on
• No messages present and no incoming call: Off
2. Light Pattern of the Line Status Buttons
Intercom
Line Status
Outside (CO) Line Status
Line Status
Button
Red on
Off
Green on
Light
Pattern
Slow green
flashing
Moderate–
speed green
flashing
Rapid green
flashing
Slow red
flashing
S-CO G-CO O-CO INTERCOM
Idle
This extension is using the line.
This extension is holding the line.
This extension is holding the line using Exclusive Call Hold
or using the line for an unattended conference.
Incoming call
Another extension
is holding the line.
–
–––
Rapid red
flashing
Incoming call
–
–––
Line(s) in use