Unit Descriptions - RF Path P/N 709C011801 Page 34
HEU (Headend Unit)
The HEU performs the following main functions:
• Conditions (up to 12) RF sources to a level required for feeding to the Optical Interface Unit (OIM).
• Enables the configuration of up to three sectors consisting of groups of RF services.
• Main HEU – includes HCM module enabling single source control and management of the ONE™ solution RF path
• Auxiliary HEU – includes ACM modules and is managed via the HCM in the Main HEU
Note: Only one HEU per system can be installed with an HCM module and serves as the “Main HEU”. Any additional HEU
chassis are installed with ACM modules and are considered “Auxiliary HEUs”.
Each HEU supports up to 12 services. For additional services or density, two or more HEU units can be cascaded so that the
Auxiliary HEUs are managed from the Main HEU (via the HCM). For HEU installation procedure, see section 5.1.2.
Figure 2-2. HEU Front Panel with Installed Modules
Module Description
HCM (Headend Control Module)
Provides system management and control functions. The HEU in
which the HCM is installed serves as the Main HEU. See
section 2.1.1.1.
ACM (Auxiliary Control Module)
Provides management connections to the HCM. HEU chassis with
ACM modules are considered Auxiliary HEUs and are managed via
the HCM.
PSM (Power Supply Modules)
PSM-DC: 48 V DC
Note: If two are installed, both must be powered on. See
sections 2.1.1.6. (PSM-AC) and 2.1.1.7 (PSM-DC).
RIM (RF Interface Module)
Provides the service specific RF interface to the RF source. See
section 2.1.1.3.
RIX (RF Expander Module)
Service specific conditioner units. See section 2.1.1.4.
Table 2-1. HEU Front Panel Interface Definitions
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