# Synchronization unit⁣⁣⁣⁣⁣⁣⁣

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**AUX-ODU-SYNC** is a TDD synchronization hub, which has been designed to provide a timing reference to Base Stations sectors of Evolution family devices. In combination with proprietary TDMA-based wireless architecture, AUX-ODU-SYNC completes the solution, providing TDD synchronization to its systems, both legacy and newly deployed.

TDD synchronization eliminates self-interference between multiple co-located units and enables frequency re-use within the same site. Astra’s implementation supports not only intra-, but inter-site synchronization too, thanks to the fact that the timing reference is GNSS-based.

<table><thead><tr><th width="227">Parameter</th><th>Description</th></tr></thead><tbody><tr><td><strong>Compatible models</strong></td><td>Evolution BS: E5-BSI, E5-BSQ, E5-BSE, E6-BSI, E6-BSE</td></tr><tr><td><strong>Compatible power supplies</strong></td><td><ul><li>IDU-BS-G(56W)</li><li>IDU-CPE-G(24W)</li><li>AUX-ODU-INJ-G</li><li>IDU-LA-G(V.01)</li></ul></td></tr><tr><td><strong>Consumption, W</strong></td><td>up to 4</td></tr><tr><td><strong>GNSS antenna</strong></td><td>Embedded, active</td></tr><tr><td><strong>GNSS receiver</strong></td><td>Embedded, GPS/GLONASS</td></tr><tr><td><strong>Indicators</strong></td><td><p>Indicators is located near the power port of AUX-ODU-SYNC:</p><ul><li>POWER - power.</li><li>SYNC - TDD synchronization.</li></ul></td></tr><tr><td><strong>Input voltage, VDC</strong></td><td>±19..±56</td></tr><tr><td><strong>Interfaces and connectors</strong></td><td><ul><li>Port 0-6: sync outs (7 RJ-45 connectors to connect to ODU with special cable CAB-SYNC-E)</li><li>Power: DC input (1 RJ-45 connector)</li></ul></td></tr><tr><td><strong>PoE type</strong></td><td>Passive PoE (4,5,7,8 Ethernet pins used)</td></tr><tr><td><strong>Size and Weight</strong></td><td>180х170х75mm, 0.65kg</td></tr><tr><td><strong>Temperature range</strong></td><td><ul><li>ODU: -40…+60°С</li><li>IDU: 0...+40°С</li></ul></td></tr><tr><td><strong>Water and Dust protection</strong></td><td>IP66 and IP67</td></tr></tbody></table>

### AUX-ODU-SYNC Mounting <a href="#synchronizationunit-aux-odu-syncmounting" id="synchronizationunit-aux-odu-syncmounting"></a>

AUX-ODU-SYNC can be installed on a pole, using fasteners from the delivery package:

1. Screw the threaded rod to the unit case.
2. Tighten the device and the bracer on the pole and fix them by the threaded rod using the nuts and washers as shown at the picture
3. Attach the grounding cable to the unit case using the grounding bolt.

<figure><img src="https://2734851754-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FnG7V17JtC1mMJOmveKc6%2Fuploads%2FwU6EcIePRKsoAhU1GXUL%2Fimage.png?alt=media&#x26;token=6ae9befe-3255-4010-aeed-f26ffa4d92ae" alt=""><figcaption></figcaption></figure>

{% hint style="danger" %}
CAUTION

Missing or bad grounding may leave the unit vulnerable to lightning damage.
{% endhint %}

### AUX-ODU-SYNC Cable gland Assembling <a href="#synchronizationunit-aux-odu-synccableglandassembling" id="synchronizationunit-aux-odu-synccableglandassembling"></a>

In order to ensure that the cable gland remains sealed under any environmental conditions, please, follow the assembly sequence according to the procedure below:

1. Put the cable gland nut (1), the split sealing grommet (2) and the cable gland threaded coupling (3) onto the cable
2. Crimp the connector onto the cable using the crimping tool:
   1. For connection to the port Power terminate the FTP Cat.5e cable with the unshielded RJ-45 connector (4) according to the EIA/TIA-568B. Do not use the shielded RJ-45 connector on this end of the cable as it should be attached on the IDU end (to provide grounding circuit)
   2. For connection to the ports 0-6 use the ready-assembled specialized CAB-SYNC-E (5) cables
3. Insert the connector of the pre-terminated cable into the corresponding socket until you hear a click
4. Screw the cable gland threaded coupling (3) into the port and tighten it. Do not apply excessive force
5. Tighten the sealing grommet (2) by the cable gland nut (1). Do not apply excessive force.

{% hint style="danger" %}
CAUTION

Make sure that the connector is well-crimped. A loose connector can damage the device. Please note that such damage is not covered by the warranty.&#x20;
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{% hint style="danger" %}
CAUTION

Please note that the pressure equalization system in Astra devices is performed via gas exchange through a cable gland and Ethernet cable jacket with a dry room where the power supply is installed. In order to avoid AUX-ODU-SYNC failure due to moisture entering the device, for example, during the pressure drop during the rain, the cable gland assembly requirements should be met and there are should be no cracks in the Ethernet cable jacket.

In addition, you should avoid the Ethernet cable bending near the AUX-ODU-SYNC and pinching with clamps, that can bring to the pressure equalization system fault between the internal volume of the sealed AUX-ODU-SYNC and the external environment during a sudden air temperature change. This may lead to the leakage and device failures.
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### AUX-ODU-SYNC Connection to ODU <a href="#synchronizationunit-aux-odu-syncconnectiontoodu" id="synchronizationunit-aux-odu-syncconnectiontoodu"></a>

To connect AUX-ODU-SYNC to the units use the ready-assembled specialized CAB-SYNC-E cables which must be ordered additionally. Information about CAB-SYNC-E cables is available at Astra web site in the "Accessories" section.

To connect AUX-ODU-SYNC to ODU insert the RJ-45 connector with cable gland of the CAB-SYNC-E into the corresponding socket of the ODU until you hear a click. Perform the device port insulation with a cable gland as instructed above.

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