Clear-Com HX System Frames - Manual (Page 37)

4.4.6 Slot numbering
Each MVX-A16 interface card has circuitry to support 16 analog ports. A grid printed on the
matrix’s rear panel gives the numbering scheme for the analog ports.
4.5 Wiring audio devices to the matrix
An external four-wire audio device can be directly connected to a port connector through the
four audio pins. If there is excessive noise on the lines between the device and the matrix,
the device may be electronically unbalanced with the rest of the system. The device must be
isolated with external isolation transformers.
The CALL SEND output can be connected to the CALL REC input to tell the system
software that this is a directly connected port.
EHX allows the changing of the audio output reference level between -24, -21, -18, -15, -12,
-9, -6, -3, 0, +3, +6, +9, +12 and +14 dB.
With a +12dB output reference level, it is possible to drive a 200 to 400 Ohm headset
directly with a port output for such uses as direct IFB feed.
The EHX configuration software allows the changing of the audio input reference level
between -12, -9, -6, -3, 0, +3, +6, +9, +11 dB.
Figure 6: Direct matrix port connection
Shielded cable should be used.
Tip: The Eclipse HX Installation Guide gives complete details about wiring audio devices
to the matrix. The installation manual also discusses RJ-45 cables and other types of cable
required for system installation.
37 Eclipse HX-Omega User Guide