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Wireless T1 WANs Make Waves
September 20, 1999 |
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How We Tested... Wireless T1 WANs 
We tested spread-spectrum wireless T1 equipment in our Real-World Labs® at Syracuse University using Hewlett-Packard Co. Model 8494B and 8495B step attenuators to simulate the signal loss that would be experienced in multiple-mile installations. For BreezeCom's BreezeLink, which needs two antennas to operate, we installed attenuators on both links.We connected each system's T1 DSX-1 interface to an ADC Kentrox DataSmart 658 CSU/DSU. The channelization capabilities of this device allowed us to configure 16 64-Kbps DS-0 channels for data and eight DS-0 channels for voice. The 16 64-Kbps data channels, which provided 1,024 Kbps of aggregate data bandwidth, were connected using a V.35 interface to a Cisco 3600 series router on one end and a 2500 series router at the other. The eight voice channels were connected to a Nortel Meridian1 PBX system.
After introducing 60 dB of attenuation into each product's RF interface, we placed voice calls across the wireless T1 connection. All products produced acceptable results. To evaluate data throughput characteristics, we used Ganymede Software's Chariot performance-analysis software. We attached a 200-MHz Micron Millennia Pro2 running Windows NT 4.0 to one router and a 233-MHz Micron GoBook notebook running Windows 98 to the other. For each product, we ran Chariot's long-file send test in both directions across the full-duplex link, running each test for two minutes, averaging the results of three tests and comparing them to equivalent tests run using a simple T1 crossover cable between the CSU/DSUs.
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