FAQs - Iwave Communications Co., Ltd.

1.Why do we need a dedicated network?

1. In terms of network purpose

In terms of network purpose, a carrier network provides internet services to citizens for profit; therefore, operators only pay attention to downlink data and valuable area coverage. Public safety, meanwhile, usually requires a full-coverage nationwide network with more uplink data(e.g., video surveillance).

2. In some cases

In some cases, the carrier network may be shut down for security purpose(e.g., criminals might remotely control a bomb via s public carrier network).

3. In big events

In big events, the carrier network can become congested and cannot guarantee quality of Service(QoS).

2.How can we balance broadband and narrowband investment?

1. Broadband is the trend

Broadband is the trend. It is no longer economical to invest in narrowband.

2. Considering network capacity and maintenance cost

Considering network capacity and maintenance cost, the overall cost of broadband is equivalent to narrowband.

3. Gradually divert

Gradually divert narrowband budget to broadband deployment.

4. Network deployment strategy

Network deployment strategy: First, deploy continuous broadband coverage in high-benefit areas according to population density, crime rate, and security requirements.

3.What is the benefit of the emmergency command system if a dedicated spectrum is not available?

1. Cooperate with the operater

Cooperate with the operater and use the carrier network for non-MC(mission-critical) service.

2. Use POC(PTT over cellular)

Use POC(PTT over cellular) for non-MC communication.

3. Small and light

Small and light, three-proof terminal for officer and supervisor. Mobile policing apps facilitate official business and law enforcement.

4. Integrate POC

Integrate POC and narrowband trunking and fixed and mobile video through portable emmergency command system. In the unified dispatching center, open up multi-services such as voice, video, and GIS.

4.Is that possible to get more 50km transmit distance?

Yes. It is possible

Yes. It is possible. Our model FIM-2450 support 50km distance for video and Bi-directional serial data.

5.What’s the difference between FDM-6600 and FD-6100?

A Table Makes You Understand The Difference Between FDM-6600 And FD-6100

6. What is the maximum hop count of IP MESH radio?

15 hops or 31 hops

IWAVE IP MESH 1.0 models can reach 31 hops in the laboratory environment (ideal, non-theoretical value), however we cannot simulate the laboratory situation in practical application, so we suggest building a communication networking with a maximum of 16 nodes and a maximum of 15 hops in actual use.

IWAVE IP MESH 2.0 models can reach 32 nodes, maximum 31 hops in practical.

7.Does the device support Unicast/Broadcast/Multicast transmission?

Yes, the devices support Unicast/Broadcast/Multicast transmission

8.Does it do frequency hopping?

Yes, it supports frequency hopping

9.If so, how many frequency hops per second does it have?

100hops per second

10.Can it allocate more time slots to video transmission?

The physical layer's TS (time slot, such as pilot time slot, uplink, and downlink service time slot, synchronization time slot, etc.) allocation algorithm is preset and cannot be dynamically adjusted by the user.

11.Can it allocate more time slots to video transmission?

The physical layer algorithm is preset for the TS (time slot) allocation algorithm and cannot be dynamically adjusted by the user. In addition, the corresponding processing at the bottom of the physical layer (TS allocation belongs to the bottom layer of the physical layer) does not care whether the data is video or voice or general data, so it will not allocate more TS just because it is video transmission.

12.When the device completes the boot sequence, What is the maximum joining time of device to ADHOC network?

The joining time is about 30ms.

13.What is the maximum data rate that can be transmitted at the specified maximum range?

The transmission data rate depends not only on the transmission distance, but also on various wireless environmental factors, such as SNR.Per our experience, The 200mw MESH module FD-6100 or FD-61MN, air to ground 11km, 7-8Mbps The 200mw star topology module FDM-6600 or FDM-66MN: Air to ground 22km: 1.5-2Mbps

14.What is the power adjustable range of FD-6100 and FDM-6600?

-40dbm~+25dBm

15.How to restore factory Settings of FD-6100 and FDM-6600?

After starting up, pull GPIO4 low, power off and restart the FD-6100 or FDM-6600. After GPIO4 continues to be pulled down for 10 seconds, then release GPIO4. At this time, after booting, it will be restored to the factory. And the default IP is 192.168.1.12

16.What’s max moving speed that FDM-6680, FDM-6600 and FD-6100 can support?

FDM-6680: 300km/h FDM-6600: 200km/h FD-6100: 80km/h

17.Do FDM-6600 and FD-6100 support MIMO? If not, can you explain why the products have 2 RF inputs? Are these Tx/Rx separate lines?

They support 1T2R. Among the two RF interfaces, one is the AUX. interface, which can be used for reception diversity to improve wireless reception. sensitivity (there is a 2dbi~3dbi difference between connected and not connected antenna with AUX port).

18.Does FDM-6680 support MIMO?

Yes. It supports 2X2 MIMO.

19.What is the maximum relay capability? How does the data rate change according to relay count.

Our recommendation is a maximum of 15 relay, but the actual relay quantity must be based on the actual networking environment during application. In theory, each additional relay will reduce the data throughput by about1/3 (but also subject to signal quality and environmental interference and other factors).

20.What is the maximum data rate that can be transmitted at the specified maximum range? What is the minimum SNR value in this case?

Let’s take an example to explain this question: If a UAV flies at a height of 100 meters with a FD-6100 or FD-61MN module on board (the max distance of FD-6100 and FD-61MN is about 11km), the antenna of receiver unit is fixed 1.5 meters above ground.

If you use 2dbi antenna for both. Tx and Rx When distance from UAV to ground control center is 11km, the SNR is about +2, and the transmission data rate is 2Mbps.

If you use 2dbi Tx antenna, 5dbi Rx antenna. When distance from UAV to ground control center is 11km, the SNR is about +6 or +7, and the transmission data rate is 7-8Mbps.

21Does it do frequency hopping?

FHHS frequency hopping is determined by the built-in algorithm. The algorithm will select an optimal frequency point based on the current interference situation and then execute the FHSS to hop to that optimal frequency point.