Cisco Headend System Release 2.7 Design Guide

 

 

Advanced DOCSIS Set-Top Gateway 
Application Guide  
for System Release 3.8/4.3 

Direct ADSG (Advanced DOCSIS®* Set-top Gateway) allows system operators to 
set up their Digital Network Control System (DNCS) to send the following types 
of broadcast DSG data directly to a host device: 

 

System Information (SI) (ANSI SCTE 65) 

 

Emergency Alert System (EAS) (ANSI SCTE 18) 

 

Extended Application Information Table (XAIT) 

To successfully reach the host device, and therefore bypass flow to the 
CableCARD™ module, each data flow must include a broadcast tunnel (BT) 
header. 

Note: Traditionally, a host device that receives broadcast out-of-band (OOB) data 
passes it to the CableCARD module. The CableCARD module would reformat the 
data and send it back to the host device. This method of flow occurs when the 
CableCARD Communications Mode (CCM) is defined on the DNCS as indirect 
ADSG. 

This application guide is specific to the operation of the Digital Broadband 
Delivery System (DBDS) network in a direct ADSG environment for both SARA, 
with CableLabs® tru2way™ (formerly OCAP™), and third-party applications. It 
also includes guidelines for configuring the DBDS for direct ADSG with BT 
headers on the DNCS. 

* Data-Over-Cable Service Interface Specification 

 

This guide provides guidelines and sample configurations for setting up your 
overall system and for configuring the DNCS for direct ADSG with BT headers 
using an OOB data path for CableCARD host devices.