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1. Product

1.1. Main characteristics

RAy 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”). RAy 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.

Link transparency notes

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 …).

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.


Even all units 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.

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.

1.2. Mechanical interfaces

1.2.1. Antenna waveguide

Waveguide pivot

Fig. 1.2: Waveguide pivot

Waveguide pivot

Fig. 1.3: Waveguide pivot

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.

Radio connection between the antenna and RAy unit is ensured by the waveguide on RAy unit (located across the holder), where well lubricated antenna waveguide pivot nicely fits in.





1.2.2. Unit mounting

The RAy unit is mechanically fixed to the antenna by 4x 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 4x M8x30 (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. 1.4: Antenna and RAy3 unit

Antenna and RAy3 unit

Fig. 1.5: Antenna and RAy3 unit


1.2.3. Grounding screw

Grounding screw

Fig. 1.6: 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

Each unit is equipped with basic mechanical interfaces (antenna waveguide, mounting screws and grounding screw) and several interfaces for data, power and service purposes located in 3 slots:

Slots ETH1+POE, ETH2

Fig. 1.7: Slots ETH1+POE, ETH2

Slots ETH1+POE, ETH2

Fig. 1.8: Slots ETH1+POE, ETH2

Slot S

Fig. 1.9: Slot S


ETH1+POEGigabit metallic Ethernet port
 This port is capable of powering the unit with any Power over Ethernet (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.
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. 1.18, “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 )”

A set of all necessary bushing parts are delivered with each RAy unit – see a description of this standard basic accessory SET-RAY3-CON. 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. RJ45 ( ETH1+POE )

RJ45 Ethernet connector

Fig. 1.10: 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.
NOTE: 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).

    Internal RJ45 pins wiring is:

    • (V+) … 1,2,4,5

    • (V-)  … 3,6,7,8

    It is possible to use all 8 pins or only 4 pins. Use:

    • either   4,5 (V+) and 7,8 (V-)

    • or         1,2 (V+) and 3,6 (V-)

    • or both simultaneously

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 DC-RJ45 adapter).

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. 1.11: 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 ( ETH1+POE )

Power supply connector

Fig. 1.12: Power supply connector

Direct DC power source can be used to power the RAy3 unit. Slot „ETH1+POE“ allows to use the DC-RJ45 adapter 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.

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 kits in section Accessories.

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

Power via an DC-RJ45 adapter

Fig. 1.13: Power via an 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.

Power supply possibilities

Fig. 1.14: Power supply possibilities

1.4. Service interfaces

1.4.1. USB connector ( S )

USB connector

Fig. 1.15: USB connector

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.

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 Access adapters.

1.4.2. Service WiFi ( USB „S“)

USB WiFi adapter

Fig. 1.16: USB WiFi adapter

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

Optional OTH-W2-WIFI WiFi module (ordering code OTH-W2-WIFI) can be inserted in to the slot “S” USB connector (see chapter Section 1.4.1, “USB connector ( S )” for more details). Management of the WiFi port is described in Section 5.4.3, “Service access” (part “USB Accessories”).

1.4.3. Service Ethernet ( USB „S“)

Ethernet adapter

Fig. 1.17: 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 data can be transmitted using this Ethernet connection).

Optional Eth adapter (ordering code SET-XA-ETH/USB) can be inserted in to the slot “S” USB connector (see chapter Section 1.4.1, “USB connector ( S )” for more details). Management of this Ethernet port is described in Section 5.4.3, “Service access” (part “USB Accessories”).

1.4.4. RSS voltage ( S )

RSS voltage contacts

Fig. 1.18: 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. 1.19: 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. 1.20: 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. Basic technical parameters

Detailed technical parameters are stated in Chapter 9, Technical parametersTechnické parametry.

1.6.1. Communication unit RAy3-24

Outer size

  • 245 x 245 x 160 mm


  • 2.6 kg

1.6.2. Diameters of supplied antennas

RAy3 units are ready for direct mounting to:

Individual datasheets are accessible here.

Tab. 1.2: Overview of LEAX-RAy antennas

 10, 11 GHz 17, 18 GHz 24 GHz
30 cm30.1 dBi30 cm34.7 dBi30 cm37.0 dBi
60 cm35.2 dBi60 cm39.7 dBi60 cm42.4 dBi
90 cm38.5 dBi90 cm43.5 dBi90 cm45.7 dBi
120 cm41.5 dBi120 cm45.5 dBi120 cm48.4 dBi

Tab. 1.3: Overview of Jirous antennas

 10, 11 GHz 17, 18 GHz 24 GHz
38 cm29.0 dBi40 cm34.8 dBi40 cm36.8 dBi
65 cm35.5 dBi68 cm38.6 dBi68 cm41.7 dBi
90 cm37.5 dBi90 cm41.0 dBi90 cm44.0 dBi
120 cm41.0 dBi120 cm43.7 dBi120 cm46.6 dBi

Andrew (Class 2 or 3 or 4) or traditional Arkivator antennas can also be used but require an antenna mounting kit. Flexible waveguide is a general-purpose option for any antenna usage.

1.6.3. Production label

The label contains name, bar code record, CE label, etc.:

  • Type – RAy3 product line identification

  • Code – detailed identification of the unit type (for details see Section 1.7, “Ordering codes” ).

  • 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


Example of production label

Fig. 1.21: Example of production label

1.7. Ordering codes

RAy3 microwave link can be ordered standalone, see (1), or (preferably) together with feature keys for capacity, see (2), and/or with other features, see (3).

Each feature key is generated for a unique serial number of the unit (and does not work in other unit). Once installed, feature key unlocks a specific feature or function of the unit. Feature keys could be erased or upgraded.

Ordering codes for accessories, necessary to be added to RAy units to ensure a proper functionality of the whole microwave link, are listed in Chapter 2, Accessories.

1.7.1. Ordering codes for units

There are several different ordering codes for each HW model of RAy3 units. They differ in some properties like working frequency, factory defaults and limitations built in to units in the factory (not changeable later by license keys or by a user).

Tab. 1.4: Unit code scheme

Tab. 1.5: Available ordering codes – units only

RAy3Ordering codes for units
BandFrequency [GHz]Ordering codes
Lower unitUpper unit
24 GHz

24.000 – 24.250



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The proper pair (from the same row) 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).


Ordering code from the Table 1.5, “Available ordering codes – units only” is identical with item „Code“ on the Production label.

1.7.2. Ordering codes for Capacity

Maximum user data capacity can be limited by a SW feature key. Capacity feature key defines the maximum speed of the link. Available speed limits for RAy3 unit are 360 Mbps, 500 Mbps and 1000 Mbps. The Capacity feature key limit applies for transmitted data on the unit where the key is installed. It means, that for asymmetrical capacity keys could be different for each side of the link.

Each Capacity feature key allows several combinations of channels + modulations with the data speed up to the speed limit of the feature key (360, 500 or 1000 Mbps). For exact combinations for each feature key see Table 9.4, “Speeds according to Capacity feature keys”.

Capacity feature keys could be purchased bundled with RAy3 unit (and installed in the factory) or standalone or as a capacity upgrade key (both installed by user). Every Capacity feature key could be upgraded. The capacity limitation for the unit is applied according the highest speed feature key installed. Feature keys installed inside the RAy3 unit could be checked in unit management (see the section called “Feature keys” for details. Also adding (installing) a new feature key is possible there.

Bundled capacity feature keys

      Keys bundled together with RAy unit (and installed in to the unit in the factory).

Tab. 1.6: Unit keys code scheme

Available ordering codes bundled with the unit:

  • RAy3-xx-x-360

  • RAy3-xx-x-500

  • RAy3-xx-x-1000

x – means numbers or letters according to Section 1.7.1, “Ordering codes for units”

  • If no Capacity feature key is ordered, the unit is shipped with RAy3-xx-x-360 key.

Separately purchased capacity feature keys

      Keys purchased separately and installed by user.

Tab. 1.7: Capacity keys code scheme

Available ordering codes:

  • RAy3-SW-500

  • RAy3-SW-1000


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


Upgrade capacity feature keys

      Keys purchased separately and installed by user.

Tab. 1.8: Upgrade keys code scheme

Available ordering codes:

  • RAy3-SW-360-500

  • RAy3-SW-360-1000

  • RAy3-SW-500-1000


RAy3 functionality with the upgrade feature key (example:RAy3-SW-360-1000) is identical with functionality of the full capacity feature key with identical final capacity (example RAy3-SW-1000). The difference is just in purchase price.

1.7.3. Ordering codes for other feature keys

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)

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