The XRT board is a super routing matrix for Base Devices that can switch and distribute signals independently. Six of the twelve SFP ports support high-speed connections, each of which can transmit 2,048 audio channels.
Two of the fiber ports can tunnel Ethernet between two XRT boards when equipped with appropriate SFP modules. More ports can be configured on request. The data rate can be up to 1,000 megabit/s.
The routing capacity has been designed in such a way that all channels of the fiber optic connections and those of the Base Device can be included.
In a NEXUS network, large differences in the distances of the fiber optic connections can occur, among other things, so that the latency that occurs is detected and compensated for by analyzing the word clock phase position.
Half of the available fiber ports are designed as high-speed versions and can transmit up to 2048 channels. Together with the routing function, this makes it possible to chain the Base Devices according to the daisy-chain principle.
In both port-based redundancy and card redundancy, signal switching is not audible and can only be detected by a message in the operating software.
The ports of the XRT card can be equipped with interchangeable SFP fiber optic modules to meet different applications. The modules can be included in the delivery or fitted by the user. Multimodemodemodules are used as standard, which allow a transmission with a range of 500m. Alternatively, single-modem modules with a range of up to 100Km can also be used.
If two Base Devices are connected redundantly, the signals are sent over both lines, so that in the event of an accident the signals can be switched over with sample accuracy and without crackling.
When optical rerouting is enabled and a fiber optic connection fails or is disconnected, the board automatically searches for another route to the destination. This happens with an interruption of the data stream.
The network topologies are freely selectable and, for example, a circular or star-shaped connection structure can be set up.
Star networking is a combination of NEXUS Base Devices with one or two redundant fiber optic lines to form a central Base Device that is equipped with an XRT module. Thanks to the integrated matrix with 8448 inputs and outputs, up to 12 other Base Devices with all 256 audio channels can be connected. But the six high-speed ports with a transmission capacity of 2048 channels allow the exchange of all possible audio data from eight Base Devices and thus the creation of complex network topologies with several star networks that are interconnected.
The routing function of the XRT card allows all channels of multiple NEXUS Base Devices to be looped through, previously limited by the capacity of the active backplane. The fiber optic card XFOC is in principle a pure I/O board, only with the proprietary Stage Tec protocol. If the nature of the NEXUS network structure requires daisy-chaining, i.e. the transfer of audio channels from one NEXUS Base Device to the next, a correspondingly large number of the 256 time slots available per NEXUS Base Device is always used. These minimize the maximum input and output channels of the respective Base Devices. Unlike the usual XFOC card, the XRT board has its own routing matrix, so that the channel capacity of forwarded audio channels from other Base Devices is not loaded.
| XRT_04 | 1 x 8TE |
| SFP | 12x | NEXUS-fiber optic protocol | bidirectional |
| Audio channels | 512 channels at 48 kHz using 1G connection 2048 channels at 48 kHz using 6G connection |
| Capacity | 8448 sources to 8448 sinks; no routing-performance limitation when using redundant optical lines |
| Sample rates | NEXUS system clock, 32...96 kHz |
| Ports | 6 (ports 1...6) |
| Data rate | 6.25 Gbps |
| Audio channels | 2048 (max., bidirectional) |
| Data format | new NEXUS high-speed optical protocol |
| Compatibility | NEXUS low-speed optical protocol (up to 512 channels);NEXUS XFOC07 optical protocol (up to 256 channels) |
| Ports | 6 (port 7...12) |
| Data rate | 1.25 Gbps |
| Audio channels | 512 (max., bidirectional) |
| Data format | new NEXUS low-speed optical protocol |
| Compatibility | NEXUS XFOC07 optical protocol (up to 256 channels) |
| Ports | 2 (ports 11 and 12 can also be used for Ethernet tunneling) |
| Available data rate | depends on the audio-data utilization of the optical links: 100 Mbps, 1G-NEXUS optical link, max. audio utilization; 1 Gbps, 1G-NEXUS optical link, no audio utilization; 1 Gbps, 6G-NEXUS optical link, max. audio utilization |
| Port modules | optical modules or 10/100/1000 Base-T (copper) SFP modules on request |
| Temperature range | 0° C to +50° C |
| Max humidity | max. 90 %, non-condensing |
| Temperature range | –35° C to +70° C |
| Max humidity | max. 90 %, non-condensing |
| Voltage | +4,75…5,25 V |
| Currrent | 2.6 (with 12 SFPs 10 km SM, 1G) |
| Weight | 1,01 kg |
Contact
| Stage Tec Entwicklungsgesellschaft |
| für professionelle Audiotechnik mbH |
| Tabbertstraße 10-11 |
| 12459 Berlin/Germany |
| Tel. +49 30 63 99 02 - 0 |
| Fax +49 30 63 99 02 - 32 |
| office@stagetec.com |
