Technical Assistance - Valcom V-5328020 Installation And Use Manual

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 Cl 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 R 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.
Dry Loop Hi Impedance is used to interface with parallel multiple units. 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 ringside of the pair by the host equipment,
loop current is detected and the tip-side of the pair is closed. Disconnect supervision of the
ground start mode is accomplished by monitoring the loop current.
The Loop Start mode is two wire interface and has a 600 Ohm input impedance. The host
equipment draws loop current from the talk-battery which is supplied by the AmpliCenter.
Disconnect supervision of the loop start mode is accomplished by monitoring the loop
current.

TECHNICAL ASSISTANCE

When calling, have a VOM and a telephone test set available and call from the job site. Call
(540) 427-3900 and ask for PagePac Technical Support, or call (540) 427-6000 for Valcom 24-
hour Automated Support or visit our websites at http://www.pagepac.com and www.val-
com.com.
Should repairs be necessary, attach a tag to the unit clearly stating company name, address,
phone number, contact person, and the nature of the problem.
Send the unit to:
10
Valcom, Inc.
®
PagePac Repair Dept.
5614 Hollins Road
Roanoke, VA 24019-5056
947169