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CobraNet Interface Basics: Terminology and Setup Guidelines

Learn about CM1 terminology, audio channels, multicast and unicast bundles, CobraNet receivers, Ethernet connections, and network redundancy concepts for CobraNet interfaces. Understand the significance of full duplex transmission, switch and hub setups, and the Dual Link redundancy feature.

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CobraNet Interface Basics: Terminology and Setup Guidelines

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  1. CobraNet Interface HW and SW supplied by Peak Audio (CM1) Bosch CobraNet Interface (CobraNet device) Device that contains a CobraNet interfaces Conductor CobraNet interface provides Master clock and transmission arbitration for the network. There can only be one conductor!! CM1 Terminology

  2. Audio Channel Single audio channel, 48kHz sample rate, 16-20-24 bit resolution Bundle Can carry 0-8 audio channels Bundles are numbered from 1 – 65279 A bundle has a single transmitter CM1 Terminology

  3. Multicast Bundle Point to multi point connection Bundle 1 – 255 are multicast bundles Audio is always transmitted, even when no one is receiving Unicast Bundle Point to point connection Bundle 256 – 65279 are unicast bundles Audio is only transmitted if a receiver is connected to the same bundle CM1 Terminology

  4. 1 1 1 AO 1 8 # nn 1 AO 4 8 # nn AI 1 1 AI 4 28 8 # nn 1 32 CM1 8 # nn CobraNet receivers Block diagram Ethernet CobraNet transmitters CobraNet channels CobraNet bundles Audio channels 4 Fixed routing Praesideo node Praesideo system bus LBB 4404/00 CobraNet interface

  5. 1 1 1 1 CobraNet bundles CobraNet channels Audio channels 1 AO 1 1 8 8 # nn AI 1 1 1 AO 4 # nn AI 4 8 8 # nn AI 1 1 1 # nn AO 1 AI 4 28 8 8 # nn 1 1 AO 4 32 28 # nn 32 CM1 8 8 # nn # nn LBB 4404/00 CobraNet interface CobraNet transmitters Block diagram Ethernet CobraNet transmitters CobraNet channels CobraNet bundles CobraNet receivers Audio channels 4 4 Fixed routing Fixed routing Praesideo node Praesideo system bus Praesideo node CM1 Praesideo system bus LBB 4404/00 CobraNet interface CobraNet receivers

  6. Network Network D/A D/A A/D A/D Basics Audio Expander Audio Expander Screened microphone cables

  7. Network Network 44.1 kHz 44.1 kHz 44.1 kHz 44.1 kHz SRC SRC SRC SRC 48 kHz 48 kHz 48 kHz 48 kHz CobraNet interface CobraNet interface Basics CobraNet interface CobraNet interface Unicast Bundles Ethernet

  8. Network Network 44.1 kHz 44.1 kHz 44.1 kHz 44.1 kHz SRC SRC SRC SRC 48 kHz 48 kHz 48 kHz 48 kHz CobraNet interface CobraNet interface Basics CobraNet interface CobraNet interface CAT5 (Cross cable)

  9. Network Network Network D/A D/A D/A A/D A/D A/D Screened microphone cables Basics Audio Expander Audio Expander

  10. Network Network Network 44.1 kHz 44.1 kHz 44.1 kHz 44.1 kHz 44.1 kHz 44.1 kHz SRC SRC SRC SRC SRC SRC 48 kHz 48 kHz 48 kHz 48 kHz 48 kHz 48 kHz CobraNet interface CobraNet interface CobraNet interface Basics CobraNet interface CobraNet interface Unicast & Multicast Bundles Ethernet

  11. Network Network Network CAT5 44.1 kHz 44.1 kHz 44.1 kHz 44.1 kHz 44.1 kHz 44.1 kHz SRC SRC SRC SRC SRC SRC 48 kHz 48 kHz 48 kHz 48 kHz 48 kHz 48 kHz CobraNet interface CobraNet interface CobraNet interface Basics CobraNet interface CobraNet interface Switch

  12. Direct connection Cross Cable Full duplex Transmit and receive at the same time No Collisions Network Set-up CIN CIN Cross cable OK

  13. Hub Transmits data to all ports CIN CIN Hub CIN CIN Network Set-up

  14. Half duplex Cannot transmit and receive at the same time Collision transmission stops Network Set-up • Hub • Transmits data to all ports CIN CIN Hub CIN CIN NO !!

  15. Switch Can route data from one port to an other port Multiple paths possible Remembers the communication path CIN CIN Switch CIN CIN Network Set-up OK

  16. Full duplex Transmit and receive at the same time No Collision CIN CIN Switch CIN CIN Network Set-up • Switch CIN CIN Switch CIN CIN OK

  17. Point to point connection Transmitter and receiver must be available No receiver, no transmission Unicast • Unicast CIN CIN Switch CIN CIN CIN CIN Switch CIN CIN

  18. Point to multipoint connection Transmitter will always transmit Multicast • Multicast CIN CIN Switch CIN CIN CIN CIN Switch CIN CIN

  19. Redundant, parallel, Ethernet link between switches Increase bandwidth 100Mb + 100Mb No switch over delay if one link fails Switch Switch Loop Switch Switch 100Mbit 100Mbit Network redundancy: Link aggregation (trunking) • Link aggregation No Link Aggregation With Link Aggregation

  20. Redundancy for the Ethernet ring Restoring the link takes time (1 – 30 Sec) Switch Loop Network redundancy: Spanning Tree Protocol • STP CIN Switch CIN Switch CIN Switch CIN

  21. HP only Combination of Link aggregation and STP Redundancy for the Ethernet links Fast restoring Increased bandwidth Network redundancy: Meshing (HP only) • Meshing Switch Switch Switch Switch Switch Switch

  22. Dual link Activates the second Ethernet connection on the CobraNet interface if the first Ethernet connection is not working properly. This way a failing switch can have a back-up CobraNet redundancy

  23. Dual link Link activity CIN Off In use Conductor Switch CobraNet redundancy Redundant connection Redundant Ethernet ring

  24. Dual link Link activity Off In use Conductor Switch CobraNet redundancy CIN Redundant connection Redundant switch Switch Redundant Ethernet ring

  25. Dual link Activates the second Ethernet connection on the CobraNet interface if the first Ethernet connection is not working properly. This way a failing switch can have a back-up CobraNet redundancy • Pairing Interface Devices • Multiple CobraNet interfaces transmitting the same audio signal to the same channel. The conductor will allow only one. If this one fails an other is allowed to transmit. • Multiple CobraNet interfaces can receiving the same audio channel • Unicast : only one can receive, others are back-up • Multicast : all can receive

  26. Pairing Link activity CIN CIN CIN CIN Off In use Conductor Switch Switch CobraNet redundancy Same audio signal in Redundant Ethernet ring Same audio signal out

  27. Pairing Link activity CIN CIN CIN CIN Off In use Conductor Switch Switch CobraNet redundancy Same audio signal in Redundant Ethernet ring Switch Same audio signal out

  28. Pairing Link activity CIN CIN CIN CIN Off In use Conductor Switch Switch Switch Switch CobraNet redundancy Same audio signal in Redundant Ethernet ring Same audio signal out

  29. Dual link Activates the second Ethernet connection on the CobraNet interface if the first Ethernet connection is not working properly. This way a failing switch can have a back-up Pairing Interface Devices Multiple CobraNet interfaces transmitting the same audio signal to the same channel. The conductor will allow only one. If this one fails an other is allowed to transmit. Multiple CobraNet interfaces can receiving the same audio channel Unicast : only one can receive, others are back-up Multicast : all can receive CobraNet redundancy • Buddy link • Two CobraNet Interfaces (CM1) in one unit. Not possible with Praesideo

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