Cisco Headend System Release 2.7 Installation Guide
Set Up QAM Sessions
78-4036705-01 Rev D
7
Set Up QAM Sessions
Set Up GQAM Sessions
The GQAM modulator receives data on a Gigabit Ethernet (GbE) input and, if
necessary, encrypts the data before modulating it onto an radio frequency (RF)
carrier for distribution to DTAs. The GQAM modulator can also send the modified
data to network hubs on up to 16 transport streams.
necessary, encrypts the data before modulating it onto an radio frequency (RF)
carrier for distribution to DTAs. The GQAM modulator can also send the modified
data to network hubs on up to 16 transport streams.
Before you install software on the DTACS Server, you should log in to the DNCS
and set up sessions on the GQAM. These sessions will be used on the DTACS Server.
and set up sessions on the GQAM. These sessions will be used on the DTACS Server.
Consider the following before you begin provisioning GQAMs on the DNCS:
You must provision the GigE port of the GQAM for use with the DTACS
If your network uses hubs, the DTACS GQAM and its frequencies need to be
available to all the hubs in the network
available to all the hubs in the network
Though you can use any frequencies available to the GQAM, the following
frequencies are the most efficient for use with DTAs:
frequencies are the most efficient for use with DTAs:
Type
EIA
Frequency (Mhz)
STD
81
567
STD
82
573
STD
83
579
STD
84
585
STD
85
591
STD
100
651
STD
101
657
STD
68
489
STD
69
495
STD
126
807
HRC
81
564.0282
HRC
82
570.0285
Note: To enable DTAs to boot quickly, some of the DTACS channels should be one
of these frequencies.
of these frequencies.