Application Note

ManualsBrandsTechnicolor ManualsEdge QAMTechnicolor QAM6

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Understanding and configuring the QAM6

The QAM6 is a 6 channel quadrature amplitude modulator that is expandable to 12 channels. The QAM6

can be expanded in multiples of 2 channels up to the 12 channel maximum. The channel expansion is

accomplished by means of a software license file that is downloaded to the QAM6. It is designed to work

exclusively with the COM1000 system and installs directly into the COM200 chassis. When you are

connected to a COM1000 system click on the QAM link you are taken to the QAM page.

Figure 1

Summary of content (6 pages)

PAGE 1
Understanding and configuring the QAM6 The QAM6 is a 6 channel quadrature amplitude modulator that is expandable to 12 channels. The QAM6 can be expanded in multiples of 2 channels up to the 12 channel maximum. The channel expansion is accomplished by means of a software license file that is downloaded to the QAM6. It is designed to work exclusively with the COM1000 system and installs directly into the COM200 chassis.
PAGE 2
As you can see there is a lot of information presented on this page. The page can be broken down functionally into three main sections:    EdgeQAM Modulator Mega-Bits Per Second Control EdgeQAM Modulator Section Figure 2 The EdgeQAM Modulator section provides the user with the ability to address more than one QAM6 in a system. It also allows the user to retrieve the log file for all the QAM6’s in the system. The formula that is used to calculate the QAM6 IP address is 192.168.6.1+Chassis ID.
PAGE 3
Mega-Bits Per Second Section Figure 3 The Mega-Bits Per Second section of the QAM page is purely informational. The information is presented in a grid format with qam channels (Qam1 – Qam12) displayed in the vertical axis and sub channels (-1 through -6) displayed in the horizontal axis. If you use sub channels beyond -6 the grid will automatically increase in size to accommodate them. Starting with the left most column we see it contains the QAM channels Qam1 through Qam12.
PAGE 4
would be 2 X 16 = 32 32 + 3 = 35 so a port value of 35 will send the programming to the RF channel representing Qam2 QamSubChannel 3. Another way to look at it is Port = PortBase + SubChannel. The portBase listed in the grid for Qam2 is 32 and 32 + 3 = 35. The next column to the right is Chan. This is the RF channel that the QamChannel represents. This channel is set in the Control section of the QAM page using the baseChannel variable.
PAGE 5
each of the qam channels will represent. Because each of the 3 ICs represents 4 RF channels those channels must maintain adjacent channel frequency spacing. This means you can NOT cross band boundaries within a single IC that violate the 6 MHz channel spacing. The QAM6 follows the North American Cable Frequency band plan (See figure 5 below). The baseChannel represents the first channel of the group of 4 channels within that IC.
PAGE 6
North American Cable Television Frequency plan Cha nnel # Frequency Cha nnel # Frequency Cha nnel # Frequency Cha nnel # Frequency LOW Band SUPER Band Contd..