AFAR

Home > AFAR
Point-to-Point, Point-to-Multipoint, or Linear Network topologies. Wireless links in excess of 50 miles (80 km) Spread Spectrum operation at 2.4GHz. No license required in most countries. Outdoor enclosure allows mounting unit in close proximity to antennas, reducing installation cost, and reducing RF cable power losses.

Narrow RF bandwidth allows operation in crowded spectrum. Large number of non-overlapping channels. Remote management through Telnet, SNMP or "Afar Ethernet Console". Remote software updates. Synchronized RF transmissions allows deployment of large number of co-located radios. Transparent Ethernet bridging. Optional serial synchronous interface supported by pairing with Afar NetCrossing Gateways.
Specifications
AR24027 - Long Range Wireless Ethernet Bridge
Radio RF Band2.400 to 2.483 GHz
2.400 to 2.500 GHz optionRF Bandwidth:4.6 MHzRF Channels:34 in steps of 2MHz
12 non-overlapping channels
Independent tx and rx channelsTransmit Power:0 to 23 dBm (FCC)
0 to 20 dBm (CE)Modulation Type:Direct sequence spread spectrumRF Data Rates:0.25, 0.50, 1.375. 2.75 MbpsReceiver Sensitivity (10-6 BER):-97 dBm (at 0.25 Mbps)
-94 dBm (at 0.50 Mbps)
-93 dBm (at 1.375 Mbps)
-90 dBm (at 2.75 Mbps)Ethernet Port
Speed:10/100 MHz, full/half duplex, auto-negotiateConnector:8 pin circular (Lumberg 0321-08)
(RJ45 at the power inserter)Console Port
Interface:RS-232 / V.24Baud Rate:9600 to 115.2 KbaudConnector:3 pin circular (Lumberg 0321-03)Power
Input Voltage:8 to 28 Volts DC
110 to 220 VAC (external supply)Consumption:5 WattEnvironment
Operating Temperature:-40 to +70 deg C
-40 to +158 deg FHumidity:up to 95% non-condensingPhysical
Dimensions:12.0 x 22.0 x 5.6 cm
4.72" (W) x 8.66"(H) x 2.20" (D)Weight:1.1 Kg
2.4 lb
Diagram
The following are some characteristics of the AFAR wireless linear network:
Each node consists of a single radio with two RF ports. Typically a node is deployed with two directional antennas pointing at each of the node's neighbors.
Each node has an Ethernet port for connection to a LAN or directly to the user equipment.
A packet can enter the linear network at any node, through the Ethernet port. If the packet is addressed to a station at a remote LAN, the radio transmits the packet to its right or left neighbor as necessary. The packet may then go through multiple hops in one direction until it exits the linear network at its destination.
When a packet goes through multiple hops, the packet does not show up at the local LANs of the intermediate nodes.
The network supports broadcast packets, which are transmitted, left and right, until they show up at every local LAN.
The behavior described in the above paragraphs is self-learned. No user configuration is required.
All radios are peers, there is no master radio providing synchronization, therefore no single point failure.
If a node fails, the two segments of the original linear network continue to operate as two separate linear networks. Once the failed node is reactivated, the two networks automatically merge into one.
The Linear Network topology is designed to be an integral part of the PULSAR Wireless network.
Therefore the nodes can be co-located with AFAR radios running in Point-to-Multipoint and Point-to-Point without generating self-interference. Figure 2 shows an example of these combinations.

NetCrossing Gateway 1/2/E1/T1
Features
Carries two T1 or E1 circuits over IP or Ethernet packet switch networks (TDM over IP)
Unframed or user configurable channel selection for fractional E1/T1 operation
Balanced or unbalanced E1 line interface
Selectable encapsulation: Ethernet only to cross a single network, or full IP/UDP to cross multiple networks
Optional data encryption Additional User Ethernet port with transparent bridging and configurable rate limits
Remote management through Telnet, SNMP or "Afar Ethernet Console"
Low end-to-end latency
Remote software updates
Adapted for wireless applications:
Provides power to the radio
Synchronizes RF transmissions allowing deployment of large number of co-located radios
TDM over IP Applications