Q: What is WiMAX ?
A: The next generation of wireless technology is WiMAX (Worldwide Interoperability for Microwave Access). It provides advanced OFDM (orthogonal frequency-division multiple access) technology to deliver higher throughputs at greater distances. In addition, the ability to deal with interference and non line of sight applications is greatly enhanced. The technology can be used for Multi-point, Point to Point, Backhaul and Mobile applications.

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Q: What is the Libra 5816?
A: The Libra 5816 is a high performance IP wireless radio based on 802.16-2004 WiMAX standards. The radio supports the unlicensed 5.8Ghz frequency range which means no licenses are required in most countries. Multi-point and Point to Point topologies are supported. The radio supports data, voice or video. Speeds up to 72Mbps (raw) are supported with four channel bandwidth choices of 5, 10, 15 or 20Mhz. When combined with the available four modulation choices of BPSK, QPSK, QAM16 and QAM64 there are up to 25 channels you can select. The Libra 5816 supports up to six radios in one sector allowing up to 2400 users and bandwidth of 200Mbps. All units support QoS and bandwidth control. Full featured management and SNMP.

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Q: What makes the Libra 5816 different ?
A: The Libra 5816 has many features that other radios and competitors do not have. The performance, quality and price level are leading the market. The main features and advantages are:

• Proprietary WiMAX operating in the standard 5.8Ghz frequency  (no WiMAX license required in most countries)
• Industry leading choices of channel sizes plus adaptive modulation allow for the industry’s most efficient RF network planning and design. Up to 25 channels.
• Scalable design delivers a true broadband solution of up to 200 Mbps and can serve up to 2,400* users per cell
• Efficient bandwidth allocation makes wireless networks highly scalable
• Integrated antenna or external antenna Subscriber Units in an industrial strength IP68 weatherproof enclosure
• Industry leading spectral efficiency of 3.6Mbps/MHz vs. old Wi-Fi style products 2.7Mbps/ MHz
• State of the Art OFDM Technology including 256 FTT (256 sub-carriers), TDD Duplexing Format and third generation OFDM
• WiMAX QoS Options including Scheduling types as BE, UGS, RTPS and NRTPS with a maximum of 65535 service flows
• Real Possibility for NLOS (Non-Line-Of-Sight) Operation
• Over the air and local software upgrades
• DHCP and NAT support on subscriber CPE's
• VLAN support and compliance 802.1q

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Q: What are the operating frequencies of Libra 5816 ?
A: Currently the  Libra 5816 supports uplink and downlink frequencies in the 5725 MHz to 5850 MHz range (ISM Band). In quarter one of 2010 the unit will support end user configurable 5.1 to 5.8Ghz frequency range.

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Q: What is the channel bandwidth of the Libra 5816 ?
A: The Libra 5816 channel bandwidth options are 5, 10, 15 and 20 MHz.

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Q: What is the difference between TDD and FDD ?
A: FDD requires separate transmit and receive bands. TDD uses the same channel for transmit and receive.

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Q: Is TDD more efficient than FDD and why ?
A: TDD shares the same bandwidth for uplink and downlink transmission. As the Internet traffic varies continuously, TDD implementation optimizes the use of the channel resulting in higher data throughput compared to FDD implementation, where uplink and downlink have dedicated channels and if any direction is idle, the bandwidth is wasted.

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Q: What is the advantage of using 256 FFT (256 Sub Carriers) versus 64 FFT (64 Sub Carriers) ?
A:  64 FFT is a part of the 802.11a/g standard for indoor wireless systems and is easier to implement. Some vendors offer equipment based on using 64 FFT in an effort to reduce complexity and to enter the OFDM market. Although well suited for indoor applications, the 64 FFT in not well suited to extended delay paths that are apparent in outdoor applications. This includes reflective points several hundred meters in outdoors compared to only several meter in indoor use. The 256 FFT used in OFDM is better suited to accommodate long duration reflective paths.

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Q: What is the transmit power of the Libra 5816 ?
A: 0 to 20 dBm (18 dbm is recommended for the optimum performance.)  solutions to solve this problem.

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Q: What is the RSSI (Receive Sensitivity) of the Libra 5816 ?
A:

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Q: What Modulation schemes are supported ?
A: 64QAM, 16QAM, QPSK and BPSK (User Configurable).

 

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Q: What is the effective throughput of the Libra 5816 ?
A:

CINR (Carrier-to-Interference + Noise Ratio): This value shows signal (Carrier) effectiveness in db. A larger value means higher effective carriers or lower noise and co-channel interference.
Fade Margin: Equal to or greater than 14 db is recommended.

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Q: What are the key specifications of the integrated antenna ?
A: The Gain is 17.5 dBi with a beam width of 25°. The size is 30cm/30cm/8cm (12” x 12” x 2”).

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Q: What is the Libra 5816 Unit weight ?
A:

• BS (Base unit):3.5 Kg (7.7lbs)
• SS (Subscriber CPE with Integrated antenna): 3.2Kg (7.1lbs)
• LSS (Subscriber CPE with non-Integrated antenna): 3.0Kg (6.6lbs)

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Q: How does the Libra 5816 get its electrical power ?
A: The power line and the Ethernet signal are combined together by a small box called the Power Inserter into a standard outdoor CAT5 cable. One end of the CAT5 cable is terminated with a standard weatherproof connector to be plugged into the subscriber radio. The Power Inserter is equipped with three connectors: power connector, standard Ethernet connector to connect to the wired network, and a standard RJ-45 connector that connects to the outdoor radio.

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Q: What kind of connectors does a Libra 5816 unit use ?
A: The base station and subscriber have one RJ45 Ethernet connector. In addition, they have standard weatherproof connectors for the outdoor mounting requirement. The subscriber CPE without a integrated antenna also contains a standard 50 ohm N Type male connector.

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Q: What is the maximum length of CAT 5 cable between the power inserter and base station or subscriber CPE ?
A: With standard exterior grade CAT5 cable, cable runs of up to 40m (between radio and Power Inserter) can be supported by Libra5816 initially. (Note the maximum cable run supported by CAT 5 is 300 ft. or 100m). Moving the Power supply closer to the unit is an option. We provide advanced CAT 5 cable options for runs up to 100m.

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Q: How many users does Libra 5816 support ?
A: Up to 2000 users can be registered in each BS (Base Station). However due to dynamic polling only 100 active users can be supported on one BS with less than 300 ms access period (which is an acceptable duration). With a serving ratio of 8-10, a single BS at an average can service 800-1000 subscribers.

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Q: Does the Libra 5816 support any routing functionality ?
A: The Libra 5816 is a transparent Layer 2 (MAC layer) bridge and passes Ethernet data transparently. There is no routing functionality available at the present time. The Libra 5816 supports IP filtering (Downlink) and MAC filtering (uplink), as well as VLAN filtering (uplink and downlink).

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Q: What level of security is available in Libra 5816 ?
A:

• Certification Authorization: X.509
• Data Encryption: 3DES, AES

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Q: In which countries is Libra 5816 certified ?
A: The Libra 5816 is FCC (USA), IC (Canada) and SRRC (China) certified· Homologation for other regions will be done on an as required basis.

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Q: What Management Software is in the Libra ?
A: The Libra 5816 offers SNMP compliance to standard MIBs and customized Enterprise MIBs. The Libra software also has support for Telnet and Web Browser management.

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Q: Can the Libra 5816 software be upgraded ?
A: Yes, it can be upgraded locally or over the air.

 

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Q: Does the Libra 5816 support auto provisioning ?
A: Yes, the Libra 5816 supports that functionality.

 

 

 

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