125 High Speed Mode (125HSM) is Broadcom's proprietary frame-bursting and compression technology to improve 802.11g wireless LAN performance. The throughput transmission speed limit when using 125HSM is claimed to be up to 35%-40% higher than standard 802.11g.
The "125" in "125 High Speed Mode" refers to performance at a theoretical signaling rate of 125 Mbit/s: a 125HSM device can achieve a maximum throughput of 34.1 Mbit/s, which is the equivalent throughput of a system strictly following all 802.11g protocols and operating at a signaling rate of 125 Mbit/s.
When 125HSM was originally announced in 2004, it was called Afterburner. It is currently marketed as a proprietary extension of Broadcom's Xpress technology, their standards-based frame-bursting approach that is supported by their 54g Wi-Fi chipsets.
Read more about 125 High Speed Mode: Vendors, Interoperability, Alternatives
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