Sonifex NICA X, Reference Manual

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NICA X Reference Manual
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6.5 - Audio Switch Module (Optional)
The Audio Switch Module is an optional module fitted internally and is required for operational scenarios that use
audio testing for the fail and restore detectors. It is capable of performing a number of audio switching functions
The Input Audio Connector can be Routed to the Output Audio Connector for Backup options where the Primary
Service is external and the Reserve Service is provided by the NICA X Codec (see figure section 7.4 backup
diagram).
The Output Audio Connector can be routed internally to the Silence detector (without this module only the Input
Audio Connector can be routed to the Silence Detector.
The Monitor Function used in Reserve service operation allows the Audio Input Connector to be Routed to the
Audio Output Connector but also the Audio Output Connector to be routed to the audio input of the codec to send
to the remote reserve codec.
Issue 2 Audio Switch Modules have the facility to sum the Left and Right audio input. When the main mode is set
to Mono (i.e. Main mode Mono and no secondary mode or breakout). This is useful when using the Backup mode
when the Primary service is stereo with a mono backup service.
6.6 – State Machine 2
The SM2 (State Machine 2) mode of BACKUP is a custom mode of operation developed for a specific application. It
is designed to operate with a Local and Remote NICA X model 2MM to give two independent G722 audio channels
from the Remote unit to the Local Unit. The return audio path is not used. The two audio channels are described as
Channel 1 and Channel 2
General Definitions :
Channel 1 controlled by Local end unit opto input 1 (External Input connector)
Channel 2 controlled by Local end unit opto input 2 (External Input connector)
Channel 1 Remote Relay contact at Remote end unit Relay 3 (External Input connector)
Channel 2 Remote Relay contact at Remote end unit Relay 4 (External Input connector)
Channel 1 Alarm relay contact at Local end unit Relay 6 (External Output connector)
Channel 2 Alarm relay contact at Local end unit Relay 7 (External Output connector)
("On" = Current flowing through opto isolator / relay contact closed);
Operation Under Control Scenario :
Channel 1 "on"
Dial up Remote unit and Operate Remote relay for Channel 1 (Relay3);
Channel 2 "on"
Dial up Remote unit and Operate Remote relay for Channel 2 (Relay4);;
Channel 1 "off"
Turn off Remote unit Channel 1 relay (Relay3), wait approximately 10 seconds before disconnection. If channel 1
is turned back "on" within the 10 seconds leave connected and reset the timer;
Channel 2 "off"
Turn off Remote unit Channel 2 relay (Relay4), wait approximately 10 seconds before disconnection. If channel 1
is turned back "on" within the 10 seconds leave connected and reset the timer;
Operation Under Fault or Error Conditions :
No redial attempts.
Call Drop Out:
Close Local unit alarm relay contact, do not automatically redial. Alarm relay to be open circuit when Channel
control is "off";
At remote end unit if no connection or after a call drop out etc. turn "off" Remote end Relays for Channel 1 and 2.
6.6.1 - Operating States
In this operating mode, each channel has its own controlling state machine. The major states are :