Clear-Com CCI-22 - Manual (Page 21)

Vitec Group Communications
CCI-22 Dual Channel Party-Line Interface Instruction Manual 2 - 1 1
test tone is minimized. Continue adjustment until the tone is
minimal. If a deep null cannot be obtained, it is likely that something
is wrong either with the wiring in the external party line or with one of
the other devices attached to it.
Following are some troubleshooting hints if a deep null cannot be
obtained:
• If the “R” control is turned fully counter-clockwise, the line has either
more than one termination, or an excessive resistive load.
• If the “R” control is fully clockwise, then the line has no
termination.
• The “L” control compensates for the low-frequency inductive and
capacitive elements the wiring of the external party line presents
to the line. If the “L” control is fully turned in either direction, it is
likely that there is a problem in the external party line. When a
Clear-Com party line is connected, the “L” control should be just
to one side of its mid-pot position.
• The “C” control compensates for cable capacitance; the setting
depends on the length of the line. If the “C” control is fully
counter-clockwise, it indicates a very short line (under 10 ft.); this
is a valid setting for a short line.
• If the “C” control is fully clockwise, it indicates an excessively long
line (more than 4000 ft.).
CONFIGURATION
Refer to the Eclipse Configuration System Instruction Manual for
information on configuring parameters from the matrix.