I think the terms DS and High Rate, are marketing fluff. Maybe back in 1997 it was the older standard, but now its is WiFi Certified as a 802.11b.
Well the DS is more than fluff. Distributed Spread Spectrum is a technical term used to describe how most 802.11b stuff works. Frequency hopping was used at one point but is more or less gone now. So if you also saw 802.11FH it would be a technical distinction rather than marketing fluff. Seeing as this RoamAbout Card sounds kind of old then the DS would be a quite relevant description.
Check out this specification of the RoamAbout Card
http://www.enterasys.com/support/manuals/hardware/4062_03.pdf Or the full product catalogue at http://www.enterasys.com/products/product-catalog.pdf
The sample I have has the following Firmware: Hardware: v4.0 Primary Firmware: v4.4 Station Firmware: v8.35
Every card I have tested so far had a Primary Firmware and Station Firmware as listed above. The only one I have not tested is a Proxim Orinoco Clasic Gold Card. I will borrow one next week and add that to my list. The Firmware information should end up in my FAQ that I am working on.
Here is a snip from the last Firmware Update listed on the Proxim Wireless site for the Proxim Orinoco Clasic Gold Card.
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