Electroline Control Unit IV, Справочное руководство

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Product Description Control Unit IV Reference Manual
1-2 529-0004 Ver.3
1.1.2 Compatibility with previous versions
If you are upgrading to the Control Unit IV from a previous model, please note that the
Control Unit IV is compatible with the Control Unit II and replaces the Control Unit III. If
you are upgrading to firmware version 3.30 or higher from a previous version of the Control
Unit IV’s firmware, please refer to Chapters 3 and 5 for setup and upgrade details.
1.1.3 Certifications
The Control Unit carries the following industry and safety certifications:
CSA: certificate number: LR 59350-20
product class: 3862 08
applicable standards: CAN/CSA-C22.2 No. 950-95
UL Std. No. 1950 (3
rd
Edition)
FCC: Class B Part 15
CE: Class A CISPR 22
1.2 Roles
The Control Unit is a specialized computer located in the headend. Its key function is to
produce the control carrier that is used in the Electroline addressable system. The carrier
contains data for remote control of addressable devices; these devices control subscriber
services or the return path. A single Control Unit can control both subscriber services and the
return path, or two separate units can be installed to fulfill each function. In all cases, the
operating principle in the Electroline addressable system is the same: the system allows
remote control of field devices by associating a status with an Electroline address.
1.2.1 Subscriber tier management
When used in conjunction with a subscriber management system, the Control Unit remotely
switches the addressable taps deployed in the field according to the status (“hit”) it receives
from the billing system. For subscriber control, the status corresponds to a tier (e.g. basic or
pay). The Control Unit stores the status data in its memory, then encodes and transmits it on
a control carrier that is injected into the downstream cable signals. The carrier includes
encoded status messages for all the addresses in the Control Unit’s memory, regardless of
whether the address corresponds to a device installed in the cable plant or not.