35b

  • 150 megabit DSL: 35b, Super Vectoring, Vplus, Midi-DSL

    Alcatel midi coding 330x152230 megabits (up and down combined) looks to win at Deutsche Telekom. Call it what you like - Alcatel, Huawei, Adtran all have their own names. 35b - referring to the 35 MHz used - is emerging as most popular.

    35b uses more MHz to get higher speeds out of DSL. To keep the comparison meaningful, I subtract the upstream and hence call this 150 megabits. The speed is from a KPN lab test (below, KPN pr in Google translation.) Paul Spruyt of Alcatel believes speeds still have room to improve within the 35 MHz band. Adtran tells me production units suitable for volume deployment are unlikely before summer of 2016. 

  • Bonded G.fast, 35b VPlus from Broadcom

    Sun-Tzu-the-theorist-first-credited-with-the-military-importance-of-deception35b for Germany, bonding for AT&T/BT advertising. Vague claims of "up to 100% improvement" don't tell me what the result will be for most customers, which is what engineers reading this need to know. I doubt the 35b chips are delivering the 250 megabits down Broadcom salesmen promised customers for delivery about a year ago, but they haven't released data. On 35b, everyone in the industry is waiting to find out whether the tweaks to VDSL really will double downstream speeds. We need test results.  

    The desire for these chips is clear, if they deliver as hoped. Germany's DT and England's BT calculated the cost of all the field terminals in the original plans for G.fast and, the financial side of the companies balked. England's choice was to squeeze everything they can from existing terminals, increasing distances far beyond the ~100 meters in the original G.fast design. In their early testing, they are shooting for 330/50 to many homes with what I call G.halffast.