The TI/E1 Module is one of the most common choices for audio transport due to the reliability and widespread availability of T1 and E1 circuits. There are two physical slots to accomodate transport modules on the WorldNet Oslo: one for the main circuit and a second for backup.

 

Each module compromises two T1/E1 framer devices and two line interface units to facilitate drop and insert applications on a single card. When in drop-and-insert mode, the T1/E1 module provides a failsafe circuit that, in the event of total failure of the module, connects the upstream T1/E1 circuit to the downstream T1/E1 circuit, thereby preserving the integrity of the data path to any other devices on the network ring. For long haul protection, the T1/E1 module also provides an inter-card high speed connection to indicate its health condition to the second stand-by multiplexer (if fitted). In the event of bad status, the backup module takes over the whole payload from the active device thereby minimizing disruption.

 

An X.21 interface, operating in contribution mode, is also included on the T1/E1 module. Any data received by the X.21 port is then placed onto the the T1/E1 transport link. In combination with the external clock input, this module provides versatile system timing options to connect  to almost any network.

 

 

The IP Interface module is the other main alternative for audio and data transport. Again, two cards can be fitted, one for the main circuit and a second for backup or a second stream. The IP transport module is driven by a high performance Network Processing Engine (NPE) which is capable of supporting many complex IP routing infrastructures.

 

This Network Processing Engine has the power to act as a streaming server or an IP-Multiplexer in point-to-point, multiple unicast and multicast applications. Up to 24 audio routes to 24 individual destinations can be set up on the IP module's routing table.

 

An on-board VCXO on all the audio modules enables clock synchronization and stable data flow across IP links. Alternatively the IP module can be connected to an external AES/EBU or GPS reference clock to ensure synchronized delivery without introducing delay. It also supports QoS settings to ensure optimum audio performance over packetized networks.

 

WorldNet Oslo supports a variety of transport protocols such as: RTP over UDP, Single Unicast (1 sender/1 receiver), Multiple Unicast (1 sender/ up to 24 receivers) and Multicast (1 sender/all nodes are receiver).