Installation manual

Revision F • 3/12
HARRIS CORPORATION
3-16
3 Control Center Software
Messages needing more than two payloads to
complete will be repeated slower than the 1.5 sec-
ond frame rate, unless they are scheduled to ap-
pear more than once per frame. For example if the
Slogan Standard uses all 56 characters, it will need
16 payloads to complete. If it’s scheduled four
times per frame, it takes about six seconds for a
full display on the HD Radio receiver’s display:
16 / 4 (payloads/times per frame)
X 1.5 (seconds/frame) = 6 seconds
A similar situation applies to the latency of the
Service Messages. Each service requires its own
message. Only a single service’s message is broad-
cast when a Service Message is scheduled. There-
fore if a station wants to promote multiple HD
services in a timely fashion, then Service Messages
need to be scheduled more often.
As an example, assume a station has five Ser-
vices total: three audio services (HD1, HD2 and
HD3) plus two additional data services. If the sta-
tion wants information about these services to be
promoted with the least latency then the Service
Information message must be scheduled five times
in the 32 payload frame. If you’ve got five ser-
vices, then five payloads will get it done in the 1.5
second frame period.
To summarize, here are some SIS guidelines:
• Message latency is managed though
repetition
• Keep your messages as short as practical
• Allow shorter, more important messages, to
be interspersed within the schedule of
longer messages
The iBiquity default SIS schedule is included
on the HDE-200 Flash Drive in the Documenta-
tion folder (Harris\APN-146-WCF HDE-200 SIS
SETTINGS.pdf).
For further reading see the
The IBOC Handbook
by David Maxson (keep in mind that IBOC stan-
dards are a moving target, and that this handbook
was out of date on the day it was published).
3.5.5.3 Other Controls
Click System > Other Controls ... to open the
Other Controls pop-up window which is divided
into Other Controls, Audio Options, and Licensed
Features.
Other Controls Section
Enable Studio Interface
Check mark Enable Studio Interface to activate
the Remote I/O Logic connector on the rear panel
of the HDE-200 (page 2-7 has details on using
this connection). Uncheck
Enable Studio Interface
to disable this connection.
Active Input Sources
The default selection is Main & MPS, Auto-
Failover
. This setting is used when both the Main
and MPS inputs have signals connected, as would
be the case when the audio for the analog FM sig-
nal is separately processed from the MPS or HD
Radio signal. In this mode, if either of the two
AES input signals are lost, the other signal will be
used to maintain signal continuity. This causes the
Fault LED to light on the HDE-200 front panel.
Other Controls Settings Window