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1. Product

1.1. Main characteristics

RAy3 microwave units work as a point-to-point link in a full duplex setting with transfer speeds of up to 1002 Mbps.

Supported are 2 license-free bands 17 GHz (17.10 – 17.30 GHz) and 24 GHz (24.00 – 24.25 GHz). Bandwidth can be configured from 3.5 up to 112 MHz, independently for Tx and Rx. Modulation can be fixed or adaptive and can be adjusted from QPSK to 4096QAM. QPSK modulation could be on the fly (without data loss) strengthened for higher receiver sensitivity by extremely robust FEC – such modulation is marked as QPSK-S (S means “strong”). RAy3 microwave links operating in 17 and 24 GHz bands can also be operated as a Short Range Device (SRD).

RAy3 – Microwave link

Fig. 1.1: RAy3 – Microwave link

This link is formed by two RAy units, each equipped by its own parabolic antenna and accessories to be fully operational.

Hardware concept

RAy product line has been designed to have minimum possible number of hardware variants. Upgrade of functionality does not result in on-site hardware changes– everything is done by activating software feature keys (see Section 1.7, “Ordering codes” and Chapter 5, Configuration).

HW models are determined only by frequency bands, because both RAy units have identical hardware. Transmitting and receiving channels are freely defined by software and technically separated from each other by cross polarization.

Cross polarization means that one side of the link uses one polarization for transmission (e.g. horizontal) and the opposite polarization for receiving (e.g. vertical). The other side of the link is turned by 90°. It therefore transmits and receives using opposite polarization with respect to the other unit. The practical result for users is that RAy units for 17 and 24 GHz must be mounted with reverse polarity on both ends of the link.


Even all units for selected band are hardware identical, default factory settings for each RAy in the pair use different channels for L and U unit, so the link could be established using default radio parameters.

Ethernet concept

RAy links are transparent for IP and UDP Ethernet traffic. Practically all protocols passes through including MPLS and many others, except following packets:

  • Management packets targeted for RAy units itself

  • Special packets for protocols explicitly mentioned in this manual which are somehow processed by RAy units (like PTP)

  • Packets which did not went through and were discarded due to capacity limitation and/or policy rules (e.g. QoS, Shaping …)

1.2. Mechanical interfaces

This chapter describes basic properties of each RAy unit, which are important for its mechanical installation: antenna waveguide, unit fixing (screws, etc.) and unit grounding (screw + cable). Other interfaces (for data, power and service purposes) are described in next chapters Ethernet + power interfaces and Service interfaces.

1.2.1. Antenna waveguide

Antenna waveguide flange on RAy unit (located across the holder) ensures perfect microwave connection between the unit and the antenna.

RAy3 link requires the use of external parabolic antenna for each RAy unit – both for physical mounting as well as for the wireless transmission itself. Parabolic antennas from different producers are available.


Waveguide pivot and flange

Fig. 1.2: Waveguide pivot and flange


Always carefully lubricate both antenna waweguide pivot and RAy waveguide flange by thin layer of silicon grease before assembly to prevent the damage of O-ring and the surfaces. When lubricated, pivot nicely fits in to the flange.

1.2.2. Unit mounting

The RAy unit is mechanically fixed to the antenna by 4× M8 screws (one per each side of RAy unit). Installation and basic adjustment of the antenna is described in the Section 4.2, “Antenna mounting”. Attaching RAy unit to it by 4× M8×30 (Allen) screws delivered with each antenna or each mount kit is described in the Section 4.3, “RAy unit mounting”. For adjusting the exact antenna direction see Section 4.7.2, “Directing antennas” .

Antenna and RAy3 unit

Fig. 1.3: Antenna and RAy3 unit


1.2.3. Grounding screw

Grounding screw

Fig. 1.4: Grounding screw

Grounding screw is used for a proper grounding of the RAy unit, which is necessary for its function (ensured by galvanic connection to the grounded mast through a grounding cable).

One M8 screw (with standard 6-edge head) is delivered with each RAy unit. Grounding screw has two possible positions (two holes) to be mounted in. Those are located near the left and right fixing screws of the RAy unit and both are marked by a yellow grounding symbol and both are equivalent (second hole remains unused). For more information about unit grounding see Section 4.3.3, “RAy unit grounding”.


Grounding screw function is to ensure proper grounding of the RAy unit (by a grounding cable), not for mechanical fixing of the unit.

1.3. Ethernet + power interfaces

This chapter describes interfaces for user data transfer and power sourcing of the unit, as described on the picture and characterized in the table below. Remaining interfaces for service purposes are described in next chapter Service interfaces.

Slots ETH1+POE, ETH2

Fig. 1.5: Slots ETH1+POE, ETH2


ETH1+POEGigabit metallic Ethernet + Power over Ethernet (PoE) port
 This port is capable of powering the unit with any PoE power source working according to IEEE 802.3at standard.
Passive PoE from 20 to 60 V is supported (if DC input is required, it could be injected through this connector – the voltage range is identical: from 20 to 60 V).
ETH2Slot for user exchangeable SFP module
 A wide range of fibre optics Ethernet modules is available. Both single or dual mode transceivers can be used. An SFP module with metallic RJ45 interface can also be used.
 Located on SFP, just next to connectors. It is controlled by SFP module. Its function is specific for each SFP module. The typical behavior is an indication the received signal from the optical or metallic link to be within operational range.

A set of all necessary bushing parts are delivered with each RAy unit – see a description of this standard basic accessory ACS-RAy3. Additional bushing options for installation of longer connectors or other equipment are available as well. For bushings installation see Section 4.4, “Connectors assembly and disassembly”.

All accessories offered by RACOM for proper installation of the complete RAy link setup (including proper grounding) are tested for compatibility with RAy unit. See accessories listed in overview and described in details.


All bushings and plugs (including the original plugs in the flanges) must be fitted with O-rings and carefully tightened. Otherwise, the unit is not protected against moisture intake through connectors and can not offer guaranteed functionality.

1.3.1. Ethernet 1, PoE – RJ45 connector ( ETH1+POE )

RJ45 Ethernet connector

Fig. 1.6: RJ45 Ethernet connector

RJ45 socket connector marked „ETH1+POE“ is a standard 10/100/1000Mbps metallic Ethernet port. One plastic RJ45 plug for CAT5e and CAT6 cables is delivered with each RAy unit, ready to be punched to an Ethernet cable.
Higher quality and CAT7 compatible RJ45 plugs are available from RACOM as well – see for example item CON-RJ45-TLG-CAT6.

This port can be optionally used for power sourcing the unit by PoE (Power over Ethernet). Both an active PoE power supply (compliant with at least IEEE 802.3at standard known also as „PoE plus“) and a passive PoE power supply (with voltage range 20-60 V) are supported.

Technical parameters of PoE power input:

  • Supported voltage range is 20 to 60 V, both polarities are supported. For RAy unit booting the minimum required voltage is 21 V (to prevent booting with discharged 24 V battery).

    It is possible to use all 4 Eth pairs (8 pins) or only 2 Eth pairs (4 pins). Use:

    • either   4,5 (V+) and 7,8 (V-) or opposite +/- DC polarity

    • or         1,2 (V+) and 3,6 (V-) or opposite +/- DC polarity

    • or both simultaneously (with all combinations of +/- DC polarities supported)

All contacts of RJ45 connector are galvanically separated from RAy unit. It ensures galvanical separation for any kind of PoE power supply as well as for DC power sourcing (made through OTH-DC/RJ45).

More information about usage and installation of available power options can be found in Section 4.6, “Power supply” and Section 4.5, “Grounding and overvoltage protection”.

1.3.2. SFP slot ( ETH2 )

SFP slot

Fig. 1.7: SFP slot

„ETH2“ is a standard SFP slot for 10/100/1000 Mbps Ethernet SFP modules, user exchangeable. Both fibre optic and metallic Ethernet SFP modules are supported. For optical both single and dual mode fibre optics Ethernet modules (= 2 or 1 fibers) can be used. CSFP modules are not supported. RACOM offers all mentioned types of SFP modules, tested to be RAy compatible as a standard accessory.

The SFP status LED is located just next to the slot. It is controlled by SFP module. Its function is specific for each SFP module. The typical behavior is an indication the received signal from the fibre optic or metallic link to be within operational range.

Do not remove the smaller plastic screw next to ETH2 label. It is part of the cabinet and assures pressure equalization outside and inside.


It is strongly recommended to use a high quality SFP module with industry temperature range. The SFP modules listed in Accessories are thoroughly tested by RACOM and are guaranteed to function with RAy units. It is possible to use any other SFP module, but RACOM cannot guarantee they will be completely compatible with RAy units.

1.3.3. DC power ( using ETH1+POE )

Power supply connector

Fig. 1.8: Power supply connector

Power via an DC-RJ45 adapter

Fig. 1.9: Power via an DC-RJ45 adapter

Direct DC power source can be used to power the RAy3 unit. Slot „ETH1+POE“ allows to use the DC/RJ45 adapter (itemOTH-DC/RJ45) as a DC connector. It is equipped by 2 terminals (each 1.5 mm2 / AWG 14) with screws to ensure a perfect connection with cooper DC power cable. Its other end is then fitted into RJ45 connector slot „ETH1+POE“ in the RAy unit. Internal RJ45 pins wiring of DC/RJ45 adapter (item OTH-DC/RJ45) is:

  • (V+ or V-) … 1,2,4,5

  • (V- or V+) … 3,6,7,8

  • (shield) ………. floating (not connected to any pin)

Supported voltage range is 20 to 60 V, both polarities are supported. For RAy unit booting the minimum required voltage is 21 V (to prevent booting with discharged 24 V battery). Power input is galvanic separated inside RAy unit.

Optional grounding of DC cable should be connected directly to the mast or to the Grounding screw on RAy chassis, to ensure proper grounding of the cable. For grounding to the mast use suitable grounding kit – for example see Grounding in section Accessories.

More information about DC power sourcing possibilities and installation can be found in Section 4.6, “Power supply”.

Power via DC-RJ45 adapter

Fig. 1.10: Power via DC-RJ45 adapter


DC-RJ45 adapter occupies ETH1+POE port. When used, Ethernet connection to the unit has to be made through ETH2 port. Possible solutions are:

  • If fiber optic Ethernet is used (using the correct type of SFP module), RAy3 unit is powered by DC through the DC-RJ45 adapter.

  • If a metallic Ethernet has to be used together with DC power source, then metallic SFP module in ETH2 SFP slot is one of valid solutions.

Other valid possibility how to power the unit using DC power source is to use passive PoE injector or active PoE power supply with DC input and deliver the power to RAy3 unit through Ethernet cable with RJ45 connector plugged in to ETH1+POE slot.

SFP possibilities when direct DC power is used

Fig. 1.11: SFP possibilities when direct DC power is used

1.4. Service interfaces

Slot „S“ is shortcut of “Service”. It contains system connectors – standard USB port and a pair of contacts for RSS voltage output (red + gray ones). Also HW button and Status LED are located there.

Slot S

Fig. 1.12: Slot S

SUSB service connector
 For USB/WiFi or USB/ETH adapters, see Section 1.4.1, “USB connector ( S )”
RSS voltage output
 Red and green connectors (for example 0.547 V means RSS = –54.7 dBm),
see Fig. 1.16, “RSS voltage contacts”
HW button
 For service purposes: Internal backup or Factory settings,
see Section 5.6.1, “Maintenance”
Status LED
 Visible through semitransparent plug,
see Section 1.5, “Status LED ( S )”

1.4.1. USB connector ( S )

USB connector

Fig. 1.13: USB connector

USB-A port is designed for access to RAy management through USB/WIFI adapter or USB/ETH adapter plugged in to. More information about installation and configuration of available adapters can be found in Quick Guide and in Section 5.4.3, “Service access” (part “USB Accessories”).


Only RACOM recommended adapters are supported. See section USB adapters.

1.4.2. Service WiFi – optional (using USB „S“)

USB WiFi adapter

Fig. 1.14: USB WiFi adapter

Each RAy3 unit is equipped with the service WiFi interface from the factory. It is realized by standalone WiFi module inserted in to the USB connector in slot “S”. WiFi can be used solely for unit management (no user traffic can be transmitted by using this WiFi connection).

WiFi module can be disabled in FW (WiFi module is out of power then) or manually unplugged. In both cases the results are identical – no WiFi is possible. Management of the WiFi port is described in Section 5.4.3, “Service access” (part “USB Accessories”).

1.4.3. Service Ethernet – optional (using USB „S“)

Ethernet adapter

Fig. 1.15: Ethernet adapter

RAy3 unit can be equipped with the service Ethernet interface as an option. It can be used solely for unit management (no user traffic can be transmitted using this Ethernet connection).

Optional Eth adapter (ordering code OTH-USB/ETH-XA) can be inserted in to the USB connector in slot “S” (instead of WiFi module). Management of this Ethernet port is described in Section 5.4.3, “Service access” (part “USB Accessories”).

1.4.4. RSS voltage contacts ( S )

RSS voltage contacts

Fig. 1.16: RSS voltage contacts

RSS voltage output connectors are located in slot „S“ aside USB connector. This pair of contacts (red + green ones) allows to connect a voltmeter (pin diameter 2 mm) to the RAy unit and measure RSS value transformed to the voltage output.

RSS (Received Signal Strength) is a basic parameter used for directing antennas to the optimal direction. RSS output voltage is calibrated to be proportional to actual RSS dBm (for example 0.547 V means RSS –54.7 dBm). Thus a standard digital voltmeter allows to see RSS value in a digital form interactively during the antenna alignment. More information about RSS voltage output usage is in Section 4.7.2, “Directing antennas” (part “Voltmeter”) together with several alternative ways to get this value by other methods.

1.4.5. HW button ( S )

Service interfaces  

Fig. 1.17: Service interfaces

It is located in a small hole next to USB connector. It can be pushed by any tiny blunt thing with the diameter up to 2 mm. Its length has to reach about 7 mm in to the hole. (It can be ball pen cartridge – both ends work on the thin one, match, toothpick, etc.).


Usage of very sharp things for pushing the HW button (like needle, edge clip etc.) may destroy the contact inside RAy unit! Such a button destruction is not covered by warranty.

The button supports multiple functions, which are activated dependent on the state of the unit when the button is pushed and the length of the push:

Action to be performedUnit statusButton pushedSYS LED indication
internally temporary stored
customer settings
For 5 secondsFlashes Green
Factory settings

to Local unit, then reboot
Out of powerPushed before power on, released after SYS LED stops flashing redFlashes Red (delayed after power on, for a duration of 5 seconds)
Entering the
Service mode.
(Please, exit this mode
by powering off the unit)
Out of powerPushed before power on, released when SYS LED starts flashing redFlashes Red (delayed after power on)

Those actions and their use are described in detail in Section 5.6.1, “Maintenance”.

1.5. Status LED ( S )

Status LED

Fig. 1.18: Status LED

RAy3 unit id equipped with one LED indicator located inside the housing of the FOD unit in slot „S“ (during normal operation covered by semi-transparent plug). Meaning of the color combinations of this LED indicator is:


Tab. 1.1: LED status indicators

Green and
Red LEDs
    System is up and working OK

    System reports warning or alarm,
    which can be possibly repaired by user

    System reports HW alarm
    Unit is out of power or HW button pressed
    Unit is starting

1.6. Sizes, packaging and labeling

1.6.1. RAy3 unit

Outer sizes and weights for all RAy3 models are identical:

  • Outer size: 245 × 245 × 160 mm

  • Weight: 2.6 kg

Basic technical parameters like identification of the HW model, working frequency, maximum Tx power, requirements for power supply, most important certifications, etc. are visible on RAy Production label. All technical parameters are stated in detail in Chapter 9, Technical parametersTechnické parametry.

1.6.2. Production label

The label contains identification of the HW model and its serial number, basic technical parameters, most important certifications, QR code to manual, address of the producer, etc. Meaning of the most important information listed on the production label is:

  • Type – RAy3 product line identification (for details see Section 1.7, “Ordering codes” )

  • Code – detailed identification of the unit type (for details see Section 1.7.1, “RAy units” )

  • S/N – serial number, MW link consists of two separated units with two different serial numbers

  • QR code – www link to the latest version of the User manual

  • RF Power – maximum output power

  • TX, RX freq – range of working frequency

  • PoE – power supply characteristics

  • CE, FCC ID, IC or other – available certifications


Production label example

Fig. 1.19: Production label example


The processor included in the unit variant S and X uses an encryption module listed as 5A002 a.1 in the COUNCIL REGULATION (EC) No 428/2009, setting up a Community regime for the control of exports, transfer, brokering and transit of dual-use items. Units are subject to export control when exporting outside the European union, according to national, EU and US law.

Type and Code structure:

 Trade name + Gen.RAy3
 BandFrequency band in GHz
Possible values: 17, 24
 Var.Designation of product variant, if it is used. More variants can be used within one unit, i.e. more letters can be on this position. These variants can’t be ordered and included in the unit later on.
Possible values:
  none – (position not used) – means same as X
  N – no encryption HW installed, encryption will never be possible (neither HW nor SW)
  E – no encryption HW installed
  S – encryption HW installed – see export restriction above, MTU 2048 Bytes (only RAy3-24 produced by 3/2019)
  X – encryption HW installed – see export restriction above, MTU 10240 Bytes
  R – reduced RF output power -30 to -15 dBm (always in combination with N, E, S or X)
Possible values:
  L – unit transmits on lower part of the band
  U – unit transmits on upper part of the band
Note: L/U indicates TX default, which can be changed. Both units have the same HW for lower and upper unit.
 TypeSpecific product type for which type approvals like CE, FCC etc. are issued.
Possible values: RAy3-17, RAy3-24
 CodeDetailed HW identification of the unit
Note: SW keys and Optional accessories are not HW dependent and can be installed or de-installed later on, so they are not printed on Product label.

A link should consist from a pair of “-L” and “-U” units (L and U are always a last letter in Code printed on production label of each unit), but it is not mandatory (HW for L and U unit is identical and L/U settings could be assigned by SW). Using L + U pair ensures all default settings of both units match each other (including proper IP addresses as described in this manual). It ensures the link is automatically established after factory defaults (to simplify initial setting of the unit).

1.6.3. Packaging

The RAy3 radio link is supplied in a package containing two separate boxes. Delivery includes:

If only one unit is delivered, then delivery includes one piece of each item.

The unit is fixed in the box as follows:

Packaging the RAy3 unit
Packaging the RAy3 unit
Packaging the RAy3 unit

Fig. 1.20: Packaging the RAy3 unit

Initial arrangement

Fig. 1.21: Initial arrangement

SILICONE GREASE capsule Ø45mm × 25mm

Fig. 1.22: SILICONE GREASE capsule Ø45mm × 25mm



Two separate boxes in the common package are turned such that both waveguides are heading to each other. It allows to automatically establish a link between delivered RAy3 units without unpacking them from the box. See Quick Guide, step 4 or Chapter 3, Step-by-step Guide.

1.6.4. Supplied antennas

RAy3 units are ready for direct mounting to:

Individual datasheets are accessible on RACOM website.

Tab. 1.2: Overview of LEAX-RAy antennas

 10, 11 GHz 17, 18 GHz 24 GHz

Tab. 1.3: Overview of Jirous Class 2 antennas

 10, 11 GHz 17, 18 GHz 24 GHz

Jirous Class 3 antennas are available for RAy direct mounting as well. They have nearly identical sizes and gains as Jirous Class 2 antennas, but are a bit more expensive. RACOM does not keep those on stock and they are not available in our e-shop. Please order those directly from Jirous Antennas.

Andrew (Class 2 or 3 or 4) or traditional Arkivator antennas or antennas from other suppliers can also be used, but require an antenna mounting kit. Flexible waveguide is a general-purpose option for any antenna usage. Contact us for available types and details.

1.7. Ordering codes

All RAy3 models mentioned in this manual have their unique ordering codes described in following chapters. Available are also capacity keys, feature activation keys and accessories necessary to reach expected functionality of the link. All ordering codes are discussed in detail at RACOM web, and are available for purchase at RACOM E-shop.


Please your supplier to ensure completeness of your product delivery for the individual link situation, applicable spectrum regulations, local security requirements, type of power sourcing, grounding, etc.


RACOM does not have any responsibility for improper use of any offered device. It is customers full responsibility to check technical parameters of all ordered items and to use and configure them in accordance with their purpose. It is also customers full responsibility to respect all requirements applicable at the site of installation.

1.7.1. RAy units

RAy ordering codes begin with a string printed on Production label (9-11 characters long, lasting by „-L“ or „-U“). It defines HW parameters and factory settings which can not be changed later on (like working frequency, encryption HW acceleration, factory defaults and limitations built in to units in the factory like limitation of Tx power or prevention to use any form of encryption). Rest of the ordering code defines functionalities and options which could be added, erased or changed by a user later on (like SW feature key for initial capacity or an optional DC power adapter). For detailed description of the ordering code structure see RACOM web.


The proper pair of Lower (L) and Upper (U) units should be selected when ordering the microwave link. The difference between L and U code is only in default factory settings, which are different for each side of the link. Unit marked with L is set for transmission on lower frequency (and receive on higher one), while unit marked with U is set for transmission on higher frequency (and receive on lower one). This allows the link to be established without any initial manual settings – just by powering up both units at factory defaults (see Quick Guide).

1.7.2. Capacity keys

RAy units allow to pay only for purchased transmission capacity (pay as-you-grow concept). Activation keys could be purchased together with the unit or later at RACOM E-shop. Each key is generated for specific S/N of the unit and the purchased capacity. It unlocks all combinations of channels and modulations up to the purchased capacity. Once installed, a specific feature or function of the unit is allowed. Feature keys could be erased or upgraded. See Configuration / Feature keys for more details.

For allowed combinations of channel width and modulation for transmitting channel see Capacity SW keys table. The Capacity feature key limit applies for transmitted data on the unit where the key is installed. For asymmetrical capacity keys could be different for each side of the link.

Several types of SW feature key are available for RAy units:

  • Bundled capacity (ordered together with RAy units – see previous chapter)

  • Separately purchased capacity feature keys (see below)

  • Upgrade capacity feature keys (see below)


RACOM is able to generate customer specific Capacity feature keys on special request.

Separately purchased capacity feature keys

Keys purchased separately and installed by user.

Tab. 1.4: Capacity keys code scheme

For available ordering codes see RACOM web.

Upgrade capacity feature keys

Keys purchased separately and installed by user.

Tab. 1.5: Upgrade keys code scheme

For available ordering codes see RACOM web.

1.7.3. Features activation

RAy units allow to pay only for purchased features (pay as-you-grow concept). Activation keys could be purchased together with the unit or later at RACOM E-shop. Each key is generated for specific S/N of the unit and the purchased feature (or a set of features). Once installed, a specific feature or function of the unit is allowed. Feature keys could be erased or upgraded. See Configuration / Feature keys for more details.

Available feature activation keys are listed in following table:

RAy3Ordering codes for other feature keys
Ordering code





Limitation of
Tx power

 x:   P = positive value
       N= negative value
 yy: value of limit in dBm

(limits Tx power to
-15 dBm)

ver 1.0

1.7.4. Tested Accessories

Ordering codes for all accessories tested by RACOM to work properly with RAy units, are listed in Section 2.1, “Overview Přehled and described in detail in Section 2.2, “Details Detaily including full information where to buy them directly from original suppliers.

RACOM resells most of those on RACOM E-shop and are listed on Accessories section on RAy web sites.


Accessories are necessary to be added to RAy units to allow a proper functionality of the whole microwave link. Please consult your supplier to ensure completeness of your product delivery for the individual link situation, spectrum regulations, local security requirements, type of power sourcing, grounding, etc.