NOTE: Ground start interface requires common ground between paging input and telephone system by direct line or other common grounding methods.
The Dry Loop 600 Ohm is a four wire interface consisting of a dry audio pair with a 600 ohm impedance and a control pair. The page input is activated when the control pair receives a contact closure from the host equipment, connecting C1 to ground. The Dry Loop page input can also be activated by the presence of page input audio signals that exceed a set threshold. This threshold is set by the page VOX adjustment; clockwise rotation lowers the threshold and makes it more sensitive. Adjust by experimentation to account for various line loss and noise. This feature is beneficial for (amplified) microphone sources that don’t have a Music/Page control contact, or for remote AmpliCenters connected by leased pairs so that another pair is not required for Music/Page switching control.
Dry Loop Hi Impedance is used to interface with parallel multiple inputs. Input impedance is 100K ohms. Otherwise, the same as the 600 ohm dry loop operation.
The Ground Start mode is a two wire interface and has a 600 ohm input impedance. When a trunk is accessed, a momentary ground is sent to the
The Loop Start mode is two wire interface and has a 600 ohm input impedance. The host equipment draws loop current from the
