Clear-Com HX System Frames - Manual (Page 54)

6.10 Connecting to a four-wire audio device
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 18: Direct matrix frame port connection
Shielded cable should be used.
6.11 Connecting to interface modules
Interface modules convert the four-wire signals of a central matrix port to some other form of
communication (such as telephones, camera intercoms, two-way radios, and so on). In this
way, non-four-wire devices can communicate with the central matrix.
Each interface module has hardware connectors to connect to both the central matrix and to
the external device that communicates with the central matrix.
The Eclipse HX-Median has slots for 8 interface modules, in addition to 7 circuit cards
(interface cards).
The Eclipse HX-Delta has slots for 3 interface modules, in addition to 4 circuit cards
(interface cards).
Clear-Com also offers two types of interface frames, to house interface modules, the IMF-3,
and the IMF-102 interface frames. For more information, see
4.2 Locating interface frame(s) and power supplies.
54 Eclipse HX Matrix Frame Installation Guide