Sirius 800 Series User Manual
5903 Sirius 800 Audio Crosspoint Module
Crosspoint Modules 10.5
Iss 5 Rev 7
Page 168
© 2017 SAM
10.5.2 Sirius 800 Audio Crosspoint Arrangement
The Sirius 800 routers have two horizontally mounted audio crosspoint modules that send
audio signals to the output modules. The 5903 audio crosspoint module is used with the audio
capable input (4915, 5919 and 5915) and output modules (4929, 5949, 4925 and 5925).
For audio crosspoint module locations see section 8.2.1 (Sirius 830), section 8.3.1 (Sirius
840) or section 8.3.3 (Sirius 850).
The router requires a minimum of one audio crosspoint module. The optional redundant
crosspoint module can take the place of the main crosspoint module in the event of a failure.
If the redundant crosspoint module has become active due to a failure on the main crosspoint
module, the system is no longer redundant.
10.5.3 Audio Crosspoint Operation
Each audio capable input module (4915, 5919 and 5915) creates two identical multiplexed
audio transport streams, each of which contains all of the audio channels on the input module
(up to 768 mono channels). One transport stream is sent to the main audio crosspoint module
and a duplicate transport stream is sent to the redundant audio crosspoint module.
Similarly each audio crosspoint module generates a multiplexed audio transport stream (up to
768 mono channels) to each audio capable output module (4929, 5949, 4925 and 5925).
Each of the output modules receives one transport stream from each of the audio crosspoint
modules.
10.5.4 Redundant Audio Crosspoint Operation
The redundant crosspoint design is based around protecting against crosspoint module
failure. In normal operation all of the routes pass through both crosspoint modules and the
individual output modules will use the audio signals from the main crosspoint module.
If an output module detects an error in the transport stream from the main audio crosspoint
module or if the stream is not present it will use the transport stream from the redundant audio
crosspoint module. The Route Fail LED on the audio crosspoint module with the failure will
flash red, see section 10.5.1 for the location of the status LEDs.
At this point the crosspoint matrix is still capable of setting all audio routes but redundancy
protection has been lost. This failure must be addressed immediately to regain redundancy
for the crosspoint matrix.
Green
CLK
Master
Clock Master
The 5903 module either generates the audio
system clock or uses the clock generated on
the other crosspoint (if fitted).
In normal operation the main crosspoint
module generates the audio system clock and
the redundant crosspoint module is slaved to
that.
On
- this crosspoint module is supplying the
audio system clock.
Off
- this crosspoint module’s clock is slaved to
the other crosspoint module.
Note
: If the 5903 module supplying the audio
system clock fails then it is important that clock
generation is moved to the working crosspoint
before the failed crosspoint is replaced (see
section 10.5.5 for details).
LED
Color
Function
Detail
Status
Table 37
5903 Audio Crosspoint Module LED Information
