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The USB interface can support the highest transfer speeds. Although the 232 and USB transfers rates are similar with the current WiFi Wi-Fi CWM hardware, in the future newer CWM hardware will allow the USB interface to go much faster than 1000000 baud.
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The amount of time it takes to transfer a file is a function of many variables including file size, processing latencies, and link bandwidths. The following table shows the estimated throughput between the MiWi and WiFi Wi-Fi CWM versus the OKE connection type:
File Transfer | Speed | ||||
CWM | OKE Connection | CWM MiWiWiFi | CWM Wi-Fi | ||
Full Duplex Serial (TTL/RS-232) | <~2000bps | Legacy Firmware <= 140 <~OKE Baud Rate/4 (9600bps – 230400bps)/4
Latest WiFi Wi-Fi CWM FW >= 141 115200bps – ~0.34MB/minute 230400bps – ~0.58MB/minute 250000bps – ~0.62MB/minute 500000bps – ~1.0MB/minute 1000000bps – ~1.2MB/minute | |||
Half Duplex Serial (RS-485) | <~2000bps | <~OKE Baud Rate/4 (9600bps – 230400bps)/4 | |||
USB (Device or Host) | <~2000bps | Legacy Firmware <= 140 <~230400bps/4
Latest WiFi Wi-Fi CWM FW >= 141 ~1.3MB/minute | |||
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OKE implementors should use these throughput estimates along with their product requirements to help determine the CWM communication port type (USB, serial, etc.) and settings (baud rate, full/half duplex, etc.) and the recommended CWM network type (WiFiWi-Fi, MiWi, etc.) for their application. Poor wireless connectivity or OKE file transfer throttling will reduce throughput so OKE implementors should verify that file transfers are meeting their requirements during the development and integration phase.
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A MiWi CWM connected to an OKE via any communication interface can transfer a 1MB file in about 1 hour.
For the WiFi Wi-Fi CWM the OKE connection to the CWM will be the primary bottleneck for file transfers. Generally, the WiFi Wi-Fi CWM should be able to transfer files to the OKE at a significant fraction of the OKE connection's baud rate.
WiFi Wi-Fi CWM transfer time examples:
A WiFi Wi-Fi CWM connected to an OKE via USB can transfer a 1MB file in about 46 seconds.
A WiFi Wi-Fi CWM connected to an OKE via TTL full duplex serial at 115200 can transfer a 1MB file in about 3 minutes.
A WiFi Wi-Fi CWM connected to an OKE via 232 full duplex serial at 1000000 can transfer a 1MB file in about 50 seconds.
A MiWi CWM connected to an OKE via TTL full duplex serial at 115200 can transfer a 1MB file in about 1 hour.
At comparable baud rates a half-duplex serial connection will be slightly slower than a full duplex connection for OKC to OKE file transfers.
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