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3. Product

RAy2 microwave links enable transmissions in both bands requiring license fees and those that are free. They work as a point-to-point link in a full duplex setting with transfer speeds of up to 360 Mbps. Bandwidth can be configured from 1.75 up to 56 MHz. Modulation can be fixed or adaptive and can be adjusted from QPSK to 256QAM. RAy2 microwave links can also be operated as a Short Range Device (SRD).

RAy2 – Microwave link

Fig. 3.1: RAy2 – Microwave link

The link is formed by two RAy units. In the case of links operating in the RAy2-17 and RAy2-24 bands, both units have identical hardware. In the case of links operating in licensed bands, one unit (labeled L) is transmitting in the Lower and receiving in the Upper part of the band. The other unit (labeled U) is operating vice versa.

RAy2 links require the use of external parabolic antennas. Parabolic antennas from different producers are available.

Cross polarization – valid only for links operating in the RAy2-17 and RAy2-24 bands:

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 polarizations with respect to the other unit.

3.1. Mounting

RAy2 Microwave link – antenna and RAy unit

Fig. 3.2: RAy2 Microwave link – antenna and RAy unit

The antenna is attached to the mast using a holder adjustable in two planes. The RAy2 unit is then mounted on the antenna.
There are two possible mounting positions – for horizontal and vertical polarization. Installation and adjustment of the holder is described in the Section 6.2, “Antenna mounting”.


The RAy2-10, RAy2-11 and RAy2-18 units must be mounted with the same polarization while the units RAy2-17 and RAy2-24 must be mounted with reverse polarity, see Cross polarization.

3.2. Connectors

Each unit is equipped with the following interfaces:

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 40 to 60 V is also supported.
ETH2Slot for user exchangeable SFP module. A wide range of optical modules is available. Both single or dual mode transceivers can be used. An SFP module with metallic RJ45 interface can also be used.
The SFP LED (located on SFP, just next to connectors) 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.
PDC power connector, from 20 to 60 V.
HW button for service purposes: Internal backup or Factory settings, see Section 7.6.1, “Maintenance”.
SUSB service connector for USB/WiFi or USB/Eth adapters.
RSS voltage output connectors (for example 0.547 V means RSS –54.7 dBm).

Fig. 3.3: Connectors


It is strongly recommended to use a high quality SFP module. The SFP modules listed in Accessories are thoroughly tested by RACOM and are guaranteed to function with RAy2 units. It is possible to use any other SFP module, but RACOM cannot guarantee they will be completely compatible with RAy2 units.


For proper device function and its overvoltage protection a shielded Ethernet cable must be used.

It is recommended that the ETH cable should be grounded at both ends of the connection. For example, the connector CON-RJ45-UBNT-CAT6 and ETH socket on the control panel should have a grounded shield as should the connection to the RAy2 unit.

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

For detailed description see Section 6.3, “Connectors assembly” and Section 6.5, “Start up”.
Be careful when removing the bushing.

3.3. Power supply

The microwave unit can be powered either by PoE or a DC power source:

  • Standard PoE plus (IEEE 802.3at) power source connected to the “ETH1+POE” connector.
    Supported voltage range is 40 — 60 V, distances up to 100 m. 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

  • Any kind of DC power source connected to “P” 3-pin connector.
    Supported voltage range is 20 — 60 V.
    The DC power circuit must be fitted with a fuse to protect against short circuiting.


The microwave unit doesn’t support a combination of both power supplies. Only one power supply can be connected at any one time.

The internal DC power source uses galvanic separation. If the galvanic separated power source is used and the DC power line needs to be grounded (either positive or negative wire), the middle pin of the 3-port DC connector can be used to make a connection between ground and the respective power wire, see Grounding options (d),(e). If grounding is required it should only be made in one of the following ways: on the DC power source side or using the 3-port DC connector plugged into the unit.

The next figure shows all available grounding options. We recommend the use of a galvanic separated power source and no additional DC grounding – see Fig. 3.4, “Grounding options” version c).

Grounding options

Fig. 3.4: Grounding options

Power supply connector

Fig. 3.5: Power supply connector

3.4. Status LEDs

Status LEDs ( AIR - SYS - ETH )

Fig. 3.6: Status LEDs ( AIR – SYS – ETH )

Tab. 3.1: Meaning of LED status indicators

ETH1, (10/100/1000)
Flashing irregularlyLink Activity
Permanently litPort without operation (Auto Negotiat. was carried out)
Flashing regularlyAuto Negotiation in progress
Flashing irregularlyLink Activity
Permanently litPort without operation (Auto Negotiat. was carried out)
Flashing regularlyAuto Negotiation in progress
Permanently litUnit is starting
GreenPermanently litSystem OK
Flashing regularlyHW button pushed on the unit running
Factory defaults in progress
Firmware writing in progress. DO NOT POWER OFF !!
RedPermanently litSerious system error
Flashing regularlyHW button pressed during unit start
(HW button continuously pressed)
Flashing intermittentlyUnit in the service Linux
AIRGreenPermanently litLink: OK
Flashing intermittentlyLink: Connecting
RedPermanently litLink: Single
  • Flashing regularly            500 ms on / 500 ms off

  • Flashing intermittently     50 ms on / 950 ms off

  • Flashing irregularly          by passing frames


3.5. Technical parameters

Basic technical parameters are stated in Chapter 11, Technical parameters .

3.6. Dimensions

Communication unit ODU

Outer size
  • 244 x 244 x 157 mm

  • RAy2-10 — 2.8 kg

  • RAy2-11 — 2.8 kg

  • RAy2-17 — 2.5 kg

  • RAy2-18 — 2.7 kg

  • RAy2-24 — 2.5 kg

Diameters of supplied antennas

RAy2 units are ready for direct mounting to:

Individual datasheets are accessible here.

Tab. 3.2: 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. 3.3: 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.

Name plate

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

  • Type – RAy2 product line identification

  • Code – detailed identification of the unit type (for details see Section 3.7, “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

  • Power DC supply connector polarity marks


Name plate

Fig. 3.7: Name plate

3.7. Ordering codes

The proper pair (from the same row) of Lower and Upper units should be selected when ordering the microwave link. This is not valid for RAy2-17 and RAy2-24 units. In such a case the same unit is used for both sides of the link.

Tab. 3.4: Ordering codes

SW key possibilities, valid for RAy2-10, 11, 17, 18, 24:

  • RAy2-SW-200             SW feature key – Capacity up to 200 Mbps

  • RAy2-SW-360             SW feature key – Capacity up to 360 Mbps

  • RAy2-SW-200-360      SW feature key – Capacity upgrade from 200 to 360 Mbps