Cisco Cisco Digital Service Access Node (DSAN) 8200 Guide De Montage
Chapter 2 Introduction
28
OL-29943-01
Emergency Alert System Support
This section describes the Emergency Alert System (EAS) support and operation for
the DSAN device.
the DSAN device.
Distribution and Triggering
The DSAN unit supports EAS signaling via the SCTE-18 standard. The signaling is
distributed to the DSAN device via a broadcast DOCSIS® DSG Tunnel that is
configured on the CMTS. The DSAN unit continuously monitors this tunnel for
SCTE-18 data to trigger an emergency event. The unit determines the appropriate
tunnel for the events through the processing of the DOCSIS Downstream Channel
Descriptor (DCD).
distributed to the DSAN device via a broadcast DOCSIS® DSG Tunnel that is
configured on the CMTS. The DSAN unit continuously monitors this tunnel for
SCTE-18 data to trigger an emergency event. The unit determines the appropriate
tunnel for the events through the processing of the DOCSIS Downstream Channel
Descriptor (DCD).
Notification Method
The DSAN unit supports EAS notification via force tuning of specified output
channels to a particular details channel. The details channel is specified in the SCTE-
18 data in the details_OOB_Source_ID parameter. Scrolling text and audio overlay are
not supported due to the complexities of insertion to a high number of analog output
channels by the device.
channels to a particular details channel. The details channel is specified in the SCTE-
18 data in the details_OOB_Source_ID parameter. Scrolling text and audio overlay are
not supported due to the complexities of insertion to a high number of analog output
channels by the device.
Provisioning of the DSAN device should include the details channel as one of the 82
existing provisioned services on the output. In the event that the details channel
specified in an EAS event is not a provisioned service, an alarm condition is entered
indicating that the EAS details channel is not one of the provisioned channels, and
the force tune will not occur.
existing provisioned services on the output. In the event that the details channel
specified in an EAS event is not a provisioned service, an alarm condition is entered
indicating that the EAS details channel is not one of the provisioned channels, and
the force tune will not occur.
Exception Channel Handling
To support exception channels, the details channel has to be one of the 82 existing
provisioned services on the output. Exemptions to force tuning may be specified by
including exception_OOB_Source_ID parameters for the sources that wish to be
excluded. As the System Information (SI) data is carried out-of-band (OOB) for the
DSAN device, the exception_major_channel_number and
exception_minor_channel_number parameters are not used to determine exception
channels per SCTE-18 specification.
provisioned services on the output. Exemptions to force tuning may be specified by
including exception_OOB_Source_ID parameters for the sources that wish to be
excluded. As the System Information (SI) data is carried out-of-band (OOB) for the
DSAN device, the exception_major_channel_number and
exception_minor_channel_number parameters are not used to determine exception
channels per SCTE-18 specification.
EAS Message Priority
All messages with a priority level of 1 through 15 will be processed and output
services will be force-tuned as specified in the EAS message. All messages with a
priority of 0 will be disregarded.
services will be force-tuned as specified in the EAS message. All messages with a
priority of 0 will be disregarded.