Cisco DTA Control System (DTACS) 1.2 Betriebsanweisung
Chapter 7 Emergency Alert System
66
EAS With the DTACS
The DNCS generates in-band EAS messages on every QAM that carries at least one
unencrypted service.
unencrypted service.
EAS messages are received by an EAS receiver, which sends all EAS messages
directly to the DNCS. The DNCS receives the EAS messages and forwards them to
the out-of-band modulators, for the benefit of legacy devices.
directly to the DNCS. The DNCS receives the EAS messages and forwards them to
the out-of-band modulators, for the benefit of legacy devices.
The DNCS also forwards the EAS messages to each enabled QAM for the benefit of
clear QAM tuners. The QAMs multiplex the EAS messages into the in-band
transport stream. The DTA uses the in-band EAS facility of the DNCS.
clear QAM tuners. The QAMs multiplex the EAS messages into the in-band
transport stream. The DTA uses the in-band EAS facility of the DNCS.
The DNCS enables in-band EAS based on the "Default Host" channel map. Any
QAM that carries one or more clear services, as listed in the "Default Host" channel
map, also carries in-band EAS messages.
QAM that carries one or more clear services, as listed in the "Default Host" channel
map, also carries in-band EAS messages.
Note: The Default Host channel map is different from the "Default" channel map.
The Default Host channel map must be enabled for EAS to work with the DTACS.
The Default Host channel map must be enabled for EAS to work with the DTACS.