> For the complete documentation index, see [llms.txt](https://docs.gxc.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.gxc.io/hw/5g/5g-fronthaul-multiplexer/fhm-hardware-installation-guide/introduction-and-features.md).

# Introduction and Features

## System Introduction

The GXC Onyx FHM 5G Fronthaul Multiplexer is an AC-Powered, high-performance, versatile open networking fronthaul device that is designed to expand coverage and maximizes DU resources with flexibility as service providers improve their services. Implementing O-RAN’s shared cell function, the Onyx FHM enables optimization of the user’s private 5G network by utilizing DU resources efficiently and streamline the upgrading process when increasing service capacity.

The Onyx FHM is future-proofed with a powerful 4-core processor, a programmable FPGA, 10GE/25GE interfaces, and full timing features supporting IEEE 1588v2 and SyncE. It is suitable for indoor and outdoor cabinet deployments with redundant, hot swappable components for convenience, increased availability, reliability and lower costs of maintenance.

This document describes the hardware installation process for the Onyx FHM.

## System Package Contents

Check your system package for the following items.

<p align="center"><strong>System Package Contents</strong></p>

<table><thead><tr><th width="82">Item</th><th>Description</th><th width="241">Specification / Dimensions</th><th width="107">Quantity</th><th>Weight (EA)</th></tr></thead><tbody><tr><td>1</td><td>Onyx FHM Chassis without PSU</td><td>17.32” x 9.84” x 1.71”<br>(440 x 250 x 43.5mm)</td><td>1 pc.</td><td>9.22 lbs. (4.18kg)</td></tr><tr><td>2</td><td>AC Power Supply Unit (PSU)</td><td>1.99” x 8.31” x 1.58”<br>(50.5 x 211.0 x 40.2mm)</td><td>2 pcs.</td><td>1.58 lbs. (0.72kg)</td></tr><tr><td>3</td><td>Grounding Lug</td><td>1.97” x 0.44” x 0.30”<br>(50.0 x 11.1 x 7.5mm)</td><td>1 pc.</td><td>0.022 lb. (10.0g)</td></tr><tr><td>4</td><td>Grounding Lug Screw Kit</td><td>2X Screws M4, 8.0mm Long<br>4X M4 Lock Washers</td><td>1 set</td><td>0.01 lb. (3.5g)</td></tr><tr><td>5</td><td>19-inch Rack Mount Bracket</td><td>1.98” x 1.69” x 0.79”<br>(50.4 x 43.0 x 20mm)</td><td>2 pcs.</td><td>0.07 lb. (32.7g)</td></tr><tr><td>6</td><td>Rack Mount Bracket Screw Kit</td><td>8X Screws M4, 6.5mm Long</td><td>2 sets</td><td>0.02 lb. (7g)</td></tr><tr><td>7</td><td>USB 2.0 Type-A Cable</td><td>7.87” (200mm)</td><td>1 pc.</td><td>0.023 lb. (10.5g)</td></tr><tr><td>8</td><td>AC Power Cord</td><td>72.05” (1830mm)</td><td>2 pcs.</td><td>0.46 lb. (207g)</td></tr><tr><td>9</td><td>RJ45 to DB9 Female Cable</td><td>95.98” (2438mm)</td><td>1 pc.</td><td>0.23lb. (105g)</td></tr><tr><td>10</td><td>Screw Kit</td><td>2X Screw M4, 25mm Long<br>2X Dia. 8mm x 25mm Long</td><td>2 sets</td><td>0.009 lb. (4.50g)<br>0.005 lb. (2.25g)</td></tr></tbody></table>

{% hint style="info" %}
**NOTE:** If any of the above items are damaged or missing, contact your supplier.
{% endhint %}

<p align="center"><strong>GXC Onyx FHM (Fronthaul Multiplexer) Dimensions</strong></p>

<figure><img src="https://4084968256-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FgSxa0NIdBp5aDw7Lf2N9%2Fuploads%2FMlc3V9VoqnpBwfR6ijNd%2Fimage.png?alt=media&amp;token=6934c19a-72d9-414f-96d6-095a5297b3d2" alt="" width="563"><figcaption></figcaption></figure>

<p align="center"><strong>GXC 5G Onyx Platform Architecture</strong></p>

<figure><img src="https://4084968256-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FgSxa0NIdBp5aDw7Lf2N9%2Fuploads%2Fwqc3uKC8IWbRQKbYPqTd%2Fimage.png?alt=media&amp;token=2b68d9cb-b6bb-4ec9-a4fa-585e2f38cfa3" alt="" width="563"><figcaption></figcaption></figure>

### Onyx FHM - Front Panel View

<p align="center"><strong>Onyx FHM - Front Panel View</strong></p>

<figure><img src="https://4084968256-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FgSxa0NIdBp5aDw7Lf2N9%2Fuploads%2FDYNJWQXV1JnBSN7hvYd9%2Fimage.png?alt=media&amp;token=3104404d-91dc-4da6-8f31-957dbb4d6048" alt="" width="563"><figcaption></figcaption></figure>

### Onyx FHM - Rear Panel View

<p align="center"><strong>Onyx FHM - Rear Panel View</strong></p>

<figure><img src="https://4084968256-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FgSxa0NIdBp5aDw7Lf2N9%2Fuploads%2FBq99GnmFq1dR0mCEXlHI%2Fimage.png?alt=media&amp;token=6db0c7b0-3c20-4d2f-9c3e-973c413e9489" alt="" width="563"><figcaption></figcaption></figure>

### AC PSU Overview

Power Supply Unit (PSU) with 1+1 redundancy. Hot swappable, field replaceable unit (FRU).

<p align="center"><strong>PSU Dimensions and Details</strong></p>

<figure><img src="https://4084968256-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FgSxa0NIdBp5aDw7Lf2N9%2Fuploads%2F2U6vCKVez2xy4JHtl2Bx%2Fimage.png?alt=media&amp;token=e67d2646-aa00-42f2-9e5b-7eb7abda3846" alt="" width="563"><figcaption></figcaption></figure>

## Preparation

### Environmental Requirements

In addition to network planning, when determining where to place the GXC Onyx FHM you need to consider factors such as climate, hydrology, geology, the possibility of earthquakes, reliable electric power, and transportation access.

Avoid locating the unit in areas where there may be extreme temperatures, harmful gases, unstable voltages, excessive vibrations, open flames, explosives, or electromagnetic interference (e.g., large radar stations, transformer substations). Avoid areas prone to impounded water, soaking, leakage, or condensation. The following table lists the environmental specifications.

<p align="center"><strong>Environmental Specifications</strong></p>

<table><thead><tr><th width="250">Item</th><th>Description</th></tr></thead><tbody><tr><td>Operating Temperature</td><td>-40° to 65°C / -40 to 149°F</td></tr><tr><td>Relative Humidity</td><td>5 % to 95 % RH (non-condensing)</td></tr><tr><td>Atmospheric Pressure</td><td>70 kPa to 106 kPa</td></tr><tr><td>Operating voltage</td><td>100 to 240VAC (Universal)</td></tr><tr><td>Typical Power Consumption</td><td>300W (max typical)</td></tr></tbody></table>

### Mounting Considerations

The GXC Onyx FHM has a unit width of 17.32 inches (440mm), as shown above. The unit ships with rack mount brackets suitable for EIA-Standard 19-inch (483 mm) racks. The rack mount brackets can be installed at the front or in the center of the unit.

The depth of the Onyx FHM chassis is 9.84 inches (250mm) without the field replaceable PSUs. To accommodate the air inlet and front cabling, a minimum clearance of 6 inches (152mm) in front of the unit is specified, thereby making the minimum reserve depth 15.84 inches (402.3mm).

The 19-inch Rack Mount Brackets included with the GXC Onyx FHM can be utilized to mount the unit in two different positions relative to the front of the unit.

The Front Mount Approach is more commonly used for rack-mounted equipment. However, this mounting approach results in increased stress on the mounting brackets due to the center of gravity of the unit being behind the mounting point. These stresses can be resolved by installing the unit directly above other equipment that is supported by rear posts of a 4-post rack or the use of a 1U Rack Shelf.

Alternatively, a Center Mount Approach can be used for the GXC Onyx FHM. In this approach, the 19-inch Rack Mount Brackets are affixed to the unit at the center of depth mounting location. This approach reduces stress on the mounting brackets by mounting the unit at a depth very close to its center of gravity. However, utilizing this mounting approach causes the front of the Onyx FHM to protrude from the front of the rack by approximately 4.40 inches (112mm).

The following figure depicts typical Front Mount and Center Mount orientations for the GXC Onyx FHM in a 19-inch rack.

<p align="center"><strong>Onyx FHM Mounting Approaches and Critical Dimensions</strong></p>

<figure><img src="https://4084968256-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FgSxa0NIdBp5aDw7Lf2N9%2Fuploads%2FeHrnBepNe9N1VYrUCg4y%2Fimage.png?alt=media&amp;token=2d02bed5-4a46-4292-a746-35a512972a48" alt="" width="563"><figcaption></figcaption></figure>

{% hint style="info" %}
**NOTE:** Illustrations are for reference purposes only. Actual scenario and equipment may differ.
{% endhint %}

### Optical Port Overview

The following table and figure are meant to help the installer and user of the Onyx FHM in identification of the various optical ports, specify the maximum supported communication distances and the supported connection speeds.

<p align="center"><strong>Optical Port Specifications</strong></p>

| Port ID | Form Factor | Maximum Support Distance | Support Speed |
| ------- | ----------- | ------------------------ | ------------- |
| 0 - 7   | SFP28       | 6.21mi (10km)            | 10/25G        |
| 8 - 11  | SFP28       | 6.21mi (10km)            | 10/25G        |
| 12 - 13 | QSFP28      | 6.21mi (10km)            | 40/100G       |

{% hint style="info" %}
**NOTE:** Currently, only port 8 can be used as an interface connecting to DU.
{% endhint %}

<p align="center"><strong>Optical Port Identification</strong></p>

<figure><img src="https://4084968256-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FgSxa0NIdBp5aDw7Lf2N9%2Fuploads%2FcYXNebNSjdV155dlqACr%2Fimage.png?alt=media&amp;token=030d9cf0-c158-4493-b2db-42e6e21a66dc" alt="" width="563"><figcaption></figcaption></figure>

### Equipment Cooling

The GXC Onyx FHM utilizes internal fans to intake air from the front to cool the internal electronics. Heat is transferred to this air and then exhausted out the back of the unit. Care should be taken during installation to ensure that adjacent equipment in the same rack uses this same front-to-back airflow orientation.

{% hint style="warning" %}
**CAUTION:** Failure to ensure adjacent equipment utilizes a front-to-back airflow orientation can lead to elevated intake air temperatures, a reduction in the operational air temperature margins, and possible reductions in operation stability of the Onyx FHM.
{% endhint %}

<p align="center"><strong>Figure: Front-to-Back Airflow Depiction</strong></p>

<figure><img src="https://4084968256-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FgSxa0NIdBp5aDw7Lf2N9%2Fuploads%2FnEcsqEJcDnfks8NBf412%2Fimage.png?alt=media&amp;token=e566dffb-abaa-4562-b897-14fd736565f4" alt="" width="506"><figcaption></figcaption></figure>

The GXC Onyx FHM requires clearance at the front and back of the unit to ensure adequate airflow to the unit. Care should be taken to avoid equipment cables or other materials from blocking both the intake and the exhaust vents to the unit.

<p align="center"><strong>Onyx FHM Front and Back Airflow Clearances</strong></p>

<figure><img src="https://4084968256-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FgSxa0NIdBp5aDw7Lf2N9%2Fuploads%2Fy1oQUgQIUiIbm2OoMFWf%2Fimage.png?alt=media&amp;token=a8f4a58d-590c-4d58-85dc-55570e5106fd" alt="" width="563"><figcaption></figcaption></figure>

### Grounding Protection

You must protect the GXC Onyx FHM against accidental electrostatic discharge (ESD) or shortage of power to ground. The following guidelines concerning grounding must be followed.

In addition to the AC Line Ground (Signal Ground), a discrete Earth Ground shall be provided and terminated using the provided 2-Hole Compression Lug (0.625-inch (16mm) lug-to-lug spacing). This grounding lug and its associated M4 mounting screws and lock washers are included with the Onyx FHM. The installer must provide a 6 AWG Grounding Cable which will be terminated to the lug and attached to the unit where shown.

<p align="center"><strong>Grounding Lug Hardware Assembly Detail</strong></p>

<figure><img src="https://4084968256-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FgSxa0NIdBp5aDw7Lf2N9%2Fuploads%2Fx3GyAnnBYNh0MdVrJrzl%2Fimage.png?alt=media&amp;token=62ccd604-777b-4850-aaad-3c7b0564cfee" alt="" width="512"><figcaption></figcaption></figure>

<p align="center"><strong>Grounding Compression Installation Location Detail</strong></p>

<figure><img src="https://4084968256-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FgSxa0NIdBp5aDw7Lf2N9%2Fuploads%2F01ciY6o8fdLphGyyrlkO%2Fimage.png?alt=media&amp;token=8deac28d-5ced-4877-8dd6-95fe4f3c9f7f" alt="" width="563"><figcaption></figcaption></figure>

{% hint style="info" %}
**NOTE:** The Earth Ground used with the equipment shall be constant, reliable and low resistance and impedance. Ensure adequate crimp using appropriate dies and crimp tool.
{% endhint %}

Details regarding installation of the Ground Lug shall be provided in the Installation Section of this document.


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