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diretta [2026/03/16 07:45] – admindiretta [2026/05/06 00:11] (current) – [DDS (Diretta Direct Stream)] dbryu
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 +====== Diretta Setup Guide ======
  
 +===== About Diretta ======
 +
 +Diretta is a network audio protocol designed for **high-quality network audio playback**.
 +
 +In a traditional network audio system, large blocks of audio data are transmitted over the network.  
 +These large data transfers can cause fluctuations in processing load and electrical current inside audio devices.  
 +Such fluctuations may introduce additional noise that can affect sound quality.
 +
 +Diretta takes a different approach.
 +
 +Instead of sending large chunks of audio data, Diretta transmits the audio stream as **small, precisely timed packets**.  
 +This allows the playback device to process the audio data in a more stable and predictable way, which helps reduce internal noise and improves playback performance.
 +
 +A Diretta system consists of two main components:
 +
 +  * **Diretta Host** – The device that sends audio data over the network.  
 +  * **Diretta Target** – The device that receives the audio stream and outputs it to the DAC.
 +
 +In most systems:
 +
 +  * The **music player runs on the Host device**
 +  * The **Target device focuses only on audio playback**
 +
 +This separation allows the playback device to operate with minimal processing load, which can help improve overall sound quality.
 +
 +-----
 +
 +===== Diretta System Example =====
 +
 +{{ :diretta_block_diagram.png |}}
 +
 +-----
 +
 +===== What is MTU and Why Diretta Uses It =====
 +
 +MTU (Maximum Transmission Unit) defines the maximum packet size that can be transmitted over a network.
 +
 +In most networks, the default MTU value is **1500 bytes**.
 +
 +Diretta allows the MTU size to be adjusted because larger packet sizes can sometimes improve transmission efficiency and reduce processing overhead.
 +
 +However, MTU settings must match between devices in the network.
 +
 +If the MTU values do not match, network communication problems may occur.
 +
 +For this reason, MTU configuration options were added in later Eunhasu versions from 0.6.3 to allow advanced optimization of Diretta network performance.
 +
 +It is recommended to first verify that Diretta operates correctly with the default MTU value of 1500 before changing the MTU setting.
 +
 +In Eunhasu, the MTU value can be configured under System Config → Ethernet.
 +
 +When increasing the MTU value, all devices on the network (Host, Target, switches, routers, etc.) must support the configured value.
 +
 +Jumbo Frame (extended MTU) should only be used in network environments that support it.
 +
 +Additionally, the maximum supported MTU value may vary depending on the device model.
 +
 +
 +  * **sMS-2000 / sMS-1000SQ : supports MTU up to 9014**
 +  * **sMS-200 / sMS-200ultra : supports MTU up to 1500**
 +
 +-----
 +
 +
 +===== How to Configure MTU for Jumbo Frame (sMS-2000 / sMS-1000SQ) =====
 +
 +The following steps describe how to increase the MTU value to use Jumbo Frame on sMS-2000 / sMS-1000SQ.
 +
 +1. First, verify that music playback works correctly via Diretta with the default MTU value of 1500.
 +
 +2. Go to System Config → Ethernet and set the MTU value to either 4088 or 9014. 
 +(Only configure this in a network environment that supports jumbo frames.)
 +
 +3. Click Save & Reboot to restart the system.
 +
 +4. After rebooting, go to the Diretta Config page and configure the following : 
 +  * Diretta Target MTU : Set this to the same value as, or lower than, the MTU value configured in System Config.
 +  * Diretta External MTU : Set this to the same MTU value configured on the Diretta Host device (such as a PC or another Eunhasu device).
 +
 +5. Complete the remaining Diretta settings, save the configuration, and start Diretta to begin playback.
 +
 +-----
 +
 +
 +===== How to configure Diretta Target =====
 +
 +1. Open **Diretta Config**.
 +
 +2. Set:
 +
 +Diretta Mode → Target
 +
 +3. Select the **Target Audio Device**.
 +
 +4. Click **Save Changes**.
 +
 +5. Click **Start**.
 +
 +{{ :4.how_to_configure_diretta_target.png |}}
 +
 +-----
 +
 +===== How to configure Diretta Host =====
 +
 +1. Open **Diretta Config**.
 +
 +2. Set:
 +
 +Diretta Mode → Host
 +
 +3. Click **Save Changes**.
 +
 +4. Click **Start**.
 +
 +{{ :5.how_to_configure_diretta_host.png |}}
 +
 +-----
 +
 +===== Selecting the Diretta Audio Device =====
 +
 +1. Open **Music Player Config**.
 +
 +2. In the Audio Device section, select the **Diretta Target device** from the list.
 + (The device name will appear as a Diretta Target.)
 +
 +3. Click **Save Changes**.
 +
 +{{ :6.selecting_the_diretta_audio_device.png |}}
 +
 +-----
 +
 +
 +===== Using a Windows PC as a Diretta Host =====
 +
 +A Windows PC can be used as a Diretta Host to send audio data to a Diretta Target device.
 +
 +1. Install the **Diretta ASIO driver**.
 +Download and install the Diretta ASIO driver on the Windows PC.
 +[[https://docs.sotm-audio.com/lib/exe/fetch.php?media=undefined:sotmasiodriver_3_148_9.zip]]
 +
 +2. Install Packet Capture Driver. (Optional)
 +Depending on the Diretta mode, a packet capture driver may be required.
 +Install one of the following :
 +  * [[https://www.winpcap.org/devel.htm|WinPcap]]
 +  * [[https://npcap.com/|Npcap]]
 +
 + This is required only when using specific Diretta modes such as MS Mode3.
 +
 + 3. Configure the Diretta ASIO Driver.
 +After installation, run the SOtM Diretta ASIO Configure program.
 +  * Click the **Find** button.
 +  * Select the Diretta Target device from the **Connect Target** list.
 +  * Click **Save** to apply the configuration.
 +
 +{{ :7.1using_a_windows_pc_as_a_diretta_host.png |}}
 +
 +{{ :7.2ms_mode3.png |}}
 +
 +-----
 +
 +===== DDS (Diretta Direct Stream) =====
 +
 +DDS (Diretta Direct Stream) is a new streaming method introduced in Diretta version 148.00. 
 +
 +DDS uses Direct Data Streaming for audio streaming and transfers audio data directly by Ethernet frame on Ethernet Layer 2 instead of IP layer processing. 
 +
 +DDS is designed for “PURE audio stream” by minimizing protocol overhead, reducing unnecessary packet processing, and reducing software processing and CPU processing load. 
 +
 +In Diretta, control communication uses IPv6/UDP while audio streaming uses DDS. 
 +
 +DDS supports low latency and efficient streaming. 
 +
 +For more technical information about DDS, please refer to the link below.
 +[[https://www.diretta.link/dds/]]
 +
 +-----
 +
 +===== Direct Ethernet Connection Setup =====
 +
 +Direct Ethernet connection allows the **Diretta Host and Diretta Target devices to be connected directly using an Ethernet cable** without passing through a router or network switch.
 +
 +In some systems, this configuration may help reduce network traffic and interference, which can improve the stability of Diretta playback.
 +
 +Example:
 +
 +<code>
 +        Diretta Host
 +             │
 +      Direct Ethernet Cable
 +             │
 +        Diretta Target
 +             │
 +             ▼
 +             DAC
 +</code>
 +
 +This setup is optional and typically used for advanced configurations.
 +
 +----
 +
 +**Required Equipment**
 +
 +Before starting the setup, prepare the following:
 +
 +  * Ethernet crossover cable
 +  * USB Ethernet dongle or USB Wi-Fi dongle (if the device has only one Ethernet port)
 +
 +If the device has only one Ethernet port, a USB network adapter is required so the device can remain connected to the main network while using the other interface for the direct connection.
 +
 +----
 +
 +**Setup Steps**
 +
 +1. Update both the **Diretta Host** and **Diretta Target** devices to the latest Eunhasu firmware.
 +
 +2. If your device has only one Ethernet port, connect a **USB Ethernet adapter or USB Wi-Fi dongle**.
 +
 +3. Open the **Eunhasu Web GUI** on the **Diretta Target device**.
 +
 +4. Go to **System Config**.
 +
 +{{ :8.1direct_target.png |}}
 +
 +5. If using a Wi-Fi dongle, connect the device to your network.
 +
 +{{ :8.2direct_target.png |}}
 +
 +6. Access the Eunhasu Web GUI through the connected network interface.
 +
 +7. Configure a **static IP address** on the Ethernet port that will connect directly to the Diretta Host.
 +
 +Example:
 +
 +IP Address  
 +xxx.xxx.xxx.nnn
 +
 +Notes:
 +
 +  * The first three sections must match the Host network.
 +  * The final number must be different from the Host device.
 +
 +Network settings:
 +
 +  * Netmask: 255.255.255.0
 +  * Gateway: leave empty
 +  * DNS: leave empty
 +
 +{{ :8.3direct_target.png |}}
 +
 +8. Click **Save & Reboot System**.
 +
 +9. After rebooting, open the **Diretta Config page** on the Target device.
 +
 +Configure:
 +
 +  * Diretta Mode → Target
 +  * Select the **Diretta Target audio device**
 +
 +Click **Save Changes**.
 +
 +10. Click **Start** to activate **Diretta Target mode**.
 +
 +{{ :8.4direct_target.png |}}
 +
 +---- 
 +
 +**Important Notice**
 +
 +When configuring a **Direct Ethernet connection**, the Target device may temporarily connect to the network using **Wi-Fi or a USB Ethernet adapter** in order to access the Eunhasu Web GUI.
 +
 +In this situation, the **Diretta Host may detect two Diretta Target devices**.
 +
 +This occurs because the Target device becomes visible through two different network interfaces:
 +
 +  * the **direct Ethernet connection**
 +  * the **Wi-Fi or USB Ethernet connection used for configuration**
 +
 +Because of this, two Diretta Targets may appear in the Host device's Target list.
 +
 +To avoid incorrect configuration:
 +
 +  * After finishing the Target setup, it is recommended **not to use the Wi-Fi or USB Ethernet interface used for configuration**.
 +  * Use only the **direct Ethernet connection** between the Host and Target.
 +
 +When the configuration is complete, **close the Eunhasu Web GUI browser window completely** to prevent accidental access through the temporary network interface.
 +
 +----
 +
 +**Configure the Diretta Host**
 +
 +11. Open the **Eunhasu Web GUI** on the **Diretta Host device**.
 +
 +12. Go to **System Config**.
 +
 +13. Configure a **static IP address** for the Ethernet port that will connect to the Target device.
 +
 +Example:
 +
 +IP Address  
 +xxx.xxx.xxx.nnn
 +
 +Notes:
 +
 +  * The first three sections must match the Target network.
 +  * The final number must be different from the Target device.
 +
 +Network settings:
 +
 +  * Netmask: 255.255.255.0
 +  * Gateway: leave empty
 +  * DNS: leave empty
 +
 +{{ :8.5direct_host.png |(Insert Eunhasu 0.6.3 Host Ethernet screenshot)}}
 +
 +14. Click **Save & Reboot System**.
 +
 +15. Connect the **Ethernet crossover cable** between the Host and Target devices.
 +
 +----
 +
 +**Enable Diretta Host Mode**
 +
 +16. Open the **Diretta Config page** on the Host device.
 +
 +Configure:
 +
 +  * Diretta Mode → Host
 +  * Select the Ethernet port used for the direct connection
 +
 +Click **Save Changes**.
 +
 +17. Click **Start** to activate **Diretta Host mode**.
 +
 +After a short time, the **Diretta Target device should appear in the Target list**.
 +
 +{{ :8.6direct_host.png |}}
 +
 +----
 +
 +**Select the Audio Device**
 +
 +18. Open **Music Player Config**.
 +
 +19. Select the **Diretta Target device** as the audio output device.
 +
 +20. Click **Save Changes**.
 +
 +21. Start the music player and control it using your smartphone or tablet.
 +
 +-----
 +
 +===== Troubleshooting =====
 +
 +Target not detected
 +
 +  * Check that Diretta is running
 +  * Check network connections
 +
 +Playback stuttering
 +
 +  * Verify MTU configuration
 +  * Restart Diretta
 +
 +-----
 +
 +===== References =====
 +
 +  * https://www.sotm-audio.com/sotmwp/english/eunhasu-os-v0-6-3-alpha/
 +  * https://www.sotm-audio.com/sotmwp/english/direttasettings/
 +  * https://www.sotm-audio.com/sotmwp/english/how-to-set-up-a-direct-ethernet-connection-between-diretta-host-and-target-eunhasu-v0-5-9/

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