spacer 2Telebyte Gfast Testing Guide 320

gfast map nov

Dark Green: Firm commitments from incumbent: BT (10M), Belgacom, Australian NBN, Swisscom,  Austria, Bezeq Israel, Chunghwa Taiwan, Telus Canada, Telekom South Africa, SK Korea, (U.S.) AT&T, Century, Frontier, Windstream, Belgium, Omantel

Mid Green: Smaller carriers in Germany, Norway, Finland, Japan

Light Green: Incumbent likely:  France, Germany, 

english garden80+% of Brits live in single family houses, far fewer than several other European countries. BT and AT&T have natural small nodes, making 8-16 port boxes appropriate. has a profound problem in other territories, where far more people live in apartment buildings which cannot today be served with

    I first thought apartment buildings could be served by simply using multiple boxes At BBWF several told me the interference issues are insurmountable without vectoring. Vectoring 48 lines is impractical with today's chips. They don't have enough processing power and if they did there would be a heat problem.

    BT has about ~4M "distribution points" on poles and underground. There's an average of ~8 customers connected, and only a few have more than 16 drops.

The typical distance from the drop to the customer is ~35 meters. Like any DSL deployment in the real world, some customers will be screwed because they happen to be far from the box. 

    Trevor Linney of BT, working with Huawei, achieved speeds of 500-700 megabits in a test with Huawei. That's combined upstream and downstream. Distances were 19 metres to 66 metres.Trevor Linney has been a leader in development, making BT a pioneer. 

    Sckipio and Huawei/HiSilicon told me their design can be extended to 48 ports but gave no indication that will happen soon. Ikanos for two years has worked toward "full-node vectoring" so may have larger capacities. Ikanos chips aren't out the door yet. 

    BT speaks of 1 gigabit from So does the ITU, Sckipio and U.S. FCC Chairman Wheeler. That's mostly marketing hype. They combine upstream and downstream speeds for a total. For two decades, nearly everyone has characterized systems by the downstream speed alone. Nearly all real deployments share binders with VDSL or other services. The spectrum they use, typically 23 MHz, is blocked from the DSLAM ("noted".) Other services, including radio, also require notching to prevent interference.

    Alcatel's Paul Spruyt and others are more realistic, speaking of speeds of 600-800 megabits (combined.)






 BT results

BT test

The Site for gfast 230 News
A remarkable 400 people attended the very strong Broadband Forum BASE events in Berlin and Las Vegas. Trevor confirmed BT would pass the million this year. Cioffi projected “Waveguide DSL” could carry 10 gigabits a kilometer as well as a terabit 100 meters. Werner sees a 4X improvement in upstream with cDTA. Much more in next issue.

Deutsche Wants a Gigabit, Finally Realizes 50 Meg Isn't Enough
Deutsche Telekom is finally realizing that 50 megabit DSL won't make it against gigabit cable. VP Franz Seiser is blunt. "We must change radically, become disruptive and, above all, throw away things," he proclaims at BBWF. After years of DT insisting 50 megabits is plenty, we now hear "it is about Gigabit products" from DT's Robert Soukup.  
    A lucky building in Frankfurt will receive 500+ megabit service as ultra-conservative Deutsche Telekom experiments with Soukup told BBWF, "We're going to have a field test in Frankfurt with and Fiber To The Building (FTTB.) We will know by the end of the year if this is the right way to go." Hint to Soukup: Yes it is. is working well at a dozen telcos I;ve talked to.
     The details are surprising. DT is going for CORD, Open Source, Calix, and Radisys.

*** The new Telebyte Guide to Testing Gfast follows the Broadband Forum IR-337 Gfast test specification, the same used by the University of New Hampshire (UNH-IOL) for Gfast certification testing. Free download (ad) It is the best technical guide to  I have seen. Grab it. Dave

1.6 Gig in Sckipio-Calix Test
A telco tells me they are getting impressive early results from the Calix 48 port DSLAM with the new Sckipio 212 MHz chips. There still is work to do but this is encouraging. 
    Carriers want DSLAMs with more than 16 ports to reduce the deployment costs from the basement or larger field cabinets. Speed matters to the marketing side of the company; AT&T's CEO believes he must offer a true gigabit to match cable. (They've been getting ~750 megabits with first generation chips.

*** Self-Healing Wi-Fi With ASSIA Real-Q 
Beyond-the-Box visibility and control extends quality-of-experience (QoE) beyond the gateway to the end-user device for every device in the home. Based on ASSIA technology, proven across 80 million subscribers (ad)

Reverse Power 4 Port DSLAM for Australia
Australia is connecting 1M homes to, some with a Netcomm distribution point mini-DSLAM. It's a small unit designed for pole or pit mounting. It's waterproof, pressure proof, and temperature resistant. Their matching home modem is bittorrent friendly, with two USB ports for a hard drive dedicated to sharing.
     A reverse power unit at the customer, the NDD-0100-01, can save the cost of bringing power to the DSLAM. They don't expect many orders until the second half of 2018, as nbn is waiting for the second generation chips. Netcomm demonstrated RP with BT Openreach in August.

*** Sckipio's Three advances are taking to the next level. (ad)

Australia Makes it Official: to Million Plus
No news here. In September, 2015, I reported Australia's nbn Going This June. I reported the million home fiber to the curb (kerb?) was beginning. Unfortunately, they are no closer to figuring out where to find the needed $10B to $20B to cover the cost overruns. Instead, the parties are battling in Parliament about who is to blame.

2 Bonded 212 Lines = 3 Gigabits
Sckipio at BBWF is demonstrating 3 gigabits down, nearly a gigabit up, over two phone lines, bonded. Twice the bandwidth (212 MHz instead of 106 MHz) times two lines is fast. Sckipio does great demos; at CES, they showed first generation chips delivering almost 1 gig upstream.
    “Sckipio is pushing Gfast to astonishing speeds with production silicon,” CEO David Baum proclaims. Calix is using the SCK23000 chipset in their 48 port gig+ DSLAM at the show.

Read more ...