What is the best device to build wireless network between 8 building in 15 km range?

that depends on the geographical positions of the buldings and number of users in each bulding

for15 km point to point you can use: Cisco Aironet, Lancom, or TP-Link is good

Cisco Aironet1300 Series Outdoor Access Point/Bridge

Cisco Access point

Juniper WLA632

http://www.juniper.net/us/en/local/pdf/datasheets/1000359-en.pdf

Aruba is the best vendor for a solutions with this size.

Mikrotik Devices  ( Point to Point connection )

I think you can use :

http://www.cisco.com/en/US/prod/collateral/wireless/ps5679/ps5861/product_data_sheet09186ae1.html

for15 km point to point you can use: Cisco Aironet, TP-Link is good

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The RDL-3000 Ellipse manages all security, traffic scheduling and Quality of Service (QoS) functions for Redline’s extensive family of outdoor wireless TCP/IP remote data terminals. This highly configurable wireless base station features powerful processing capabilities to reliably transport any mix of wireless traffic between the base station and multiple remote sites.

• Highly reliable transport hub supports all RDL-3000 remote wireless data terminals including auto-acquire systems
• High throughput for concurrent transport of M2M telemetry and telecontrol, data, video and voice services
• Durable all-weather enclosure for reliable operation in extreme temperatures and environmental conditions
• Over-the-air monitoring, configuration and software keyed features enable upgrades without physical access
• Software-defined architecture enhances reliability and service lifetime

PRODUCT COMPLEMENTSThe Ellipse base station is fully compatible with all Redline RDL-3000 wireless remote terminals. Redline provides a complete selection of peripherals and professional services for all your deployment needs.

UNIFIED GLOBAL SOLUTIONSRedline’s patented UWT™ technology provides a truly unified wireless networking solution—across the spectrum, across your company and across the globe—enabling secure, reliable, high-speed connectivity to people and smart devices everywhere.

• Specifications

• Capability

  LOS/OLOS/NLOS PMP Base Station, PTP Terminal

  Wireless transmission

  OFDM (orthogonal frequency-division, multiplexing), TDD,2 x2 A/B MIMO

  RF Band (MHz)

  470-6981,1,1,1,1

  Channel Size (MHZ)

  3.5/5/7/14,5/10/20,6/12 software selectable1

  Modulation

  BPSK to64 QAM, TDMA

  Data Rate

  Up to120 Mbps UBR

  Max Range

  100 km (66 mi)

  Max Tx Power

  +28 dBm1 (MIMO, frequency band specific)

  Antenna Info

  External MIMO

  Wireless QoS

  Dynamic Spectrum Access & Management1

  MAC

  Per link: dynamic ARQ, dynamic adaptive modulation, dynamic and fixed TDD

  Encryption (OTA)

  AES-1281 and AES-2561 (software keyed)

  Authentication

  X.509 Certificates (software keyed)

  Connection

  10/100 Ethernet (RJ-45),2xRF N(f), GPS TNC(f)

  Ethernet Rate

  Up to100 Mbps

  Latency

  <10 ms

  Processing (PPS)

  >150,000

  Attributes

  Auto. link distance ranging, transparent bridge, DHCP pass-through,802.1Q VLAN

  Network QoS

  CIR, PIR support, multiple services per terminal,802.3x,802.1p/Q

  Management

  ClearView NMS, SNMP v2/v3, HTTP (Web), HTTPS (SSL), Telnet, SSH, RADIUS

  Temperature

  -40 to75 ˚C (-40 to167 ˚F)3

  Enclosure

  IP67 (IEC60259)

  Humidity

  100% humidity, condensing

  Surge Protection

  Built-in: PoE and RF ports

  GPS

  Built-in (software keyed)

  Power

  Standard IEEE802.3at (PoE), cable91 m (300 ft) max.

  Compliance Safety: IEC, EN, and UL/CSA60950EMC: EN301489-1, EN5.8 GHz1: IC RSS-210, FCC Part15,ETSI EN3025025.4 GHz1: IC RSS-210, FCC Part15,ETSI EN3018935.2 GHz1: IC RSS-210, FCC Part154.9 GHz1: IC RSS-111, FCC Part903.65-3.70 GHz1: IC RSS-197, FCC Part90Z3.5 GHz1: IC RSS-1923.3-3.8 GHz1: ETSI EN302326-22.6 GHz1: EN302-5442.4 GHz1: IC RSS-210, ETSI300-328,FCC Part15C22.3 GHz1: IC RSS-1952.1 GHz1: (2.025-2.110 GHz1,2.200-2.290 GHz1) ITU-R F.1098600 MHz1: IC RSS-196, FCC Part15HSecurity: FIPS140-24 Dimensions

  306.8 x230 x60.3 mm

  (12.079 x9.06 x2.375 in)

  Weight 2.7 kg (6.0 lbs) without bracket or antenna

   

  All specifications are subject to change without notice.1. Availability restricted by regional regulations, model type or product options2. Pending 3. UHF systems only 4. In-process

Bullet Compact802.11N Wireless Bridging System 

RadioLabs recognizes that networking bandwidth requirements are ever increasing, and that802.11G speeds sometimes don't cut it. With this combination kit of high power equipment, you can easily obtain wireless speeds of up to150Mbps for point to point bridging up to and exceeding5 miles.