Cisco DNCS System Release 2.8.1 3.8.1 4.3.1 사용자 가이드

Overlay technology uses a special encryption method that partially encrypts broadcast sessions to deliver content
to DHCTs. Partially encrypted sessions consist mostly of unencrypted MPEG packets and a percentage of identical
packets encrypted by our systems and by systems manufactured by other vendors. This technique allows both
our DHCTs and DHCTs from other manufacturers to function in the same network.

 services to

subscribers who have a DHCT from us or from another manufacturer.

Important: Because only GoQAM modulators provide partially encrypted sessions, set up partially encrypted
sessions on only GoQAM modulators.

Before you set up partially encrypted sessions, first make sure that all of the network elements responsible for
processing the service content are physically installed in your system. The network elements must also have
been added to the DNCS database. If necessary, refer to 

You might also want to have your network map readily available. 

Setting up a partially encrypted session takes approximately 5 minutes to complete. However, setting up a secure
or PPV service from this partially encrypted session takes from 45 minutes to an hour to complete.

Setting up a partially encrypted session and using it to provide a secure or PPV service does not impact network
performance. You can complete this procedure at any time.

The following steps summarize the tasks required to set up partially encrypted sessions. Each step provides a
link to a more detailed procedure.

1.

2.

If you have not already done so, 

3.

Create a source definition from a source in the Source List and use it to 

.

4.

Now that you have built a partially encrypted session, use this session to provide a secure or PPV

service to subscribers:



To create a secure service from this partially encrypted session, go to step 4 of 

.



To create a PPV service from this partially encrypted session, go to step 4 of 

.