Verizon passes on G.fast in favor of FTTP for MDUs
Verizon will forgo using copper-based G.fast (DSL) technology in favor of an all-out move to deploy fiber-to-the-premises (FTTP) to/from multiple-dwelling units (MDUs), according to Vincent O’Byrne, director of network planning for Verizon. Mr O’Byrne spoke August 15th at ADTRAN’s Broadband Solutions Summit in Huntsville, AL.
“Our strategy for G.Fast is not to deploy it,” O’Byrne said at the conference.
“The strategy we’re using today is fiber all the way to the living unit,” O’Byrne said. “There’s some small percentage that we use fiber to the building (FTTP) and then copper inside the building itself, but because we have two vendors on BPON and on GPON meant in those units we had 8 types of different MDU units.”
O’Byrne cited the sketchy nature of the copper network in some places and a history of VDSL2 inter-operability and speed related problems in MDUs.
“The MDU units started to go end of life and for VDSL2 there wasn’t any interoperability,” O’Byrne said. “Even though we worked on it for a year, it became nuisance so we stopped using those common ONTs and concentrated on getting fiber to the living unit.”
Speed is also an issue. “We ended up in a situation where the 13 units of VDSL2 were going end of life as well as lower speed down the surrounding Fios network, which could get up to 1 Gbps,” O’Byrne said. “With G.fast we see ourselves potentially being in the same situation five years from now where we would have to replace the same thing.”
O’Byrne said that bringing fiber directly to each premises is more of a future proof strategy. “It’s a bit more expensive to put the single family unit fiber connections out there, but we have the same kind of service as the rest of the network,” O’Byrne said. “We also found that the trouble report rate is less on the fiber all the way to the living unit.” That’s in sharp contrast to the hybrid fiber-copper technology used by AT&T in its U-Verse triple play bundle (which this author has had for almost 5 years).
Given the diversity and varying condition of copper plant in Verizon’s wider nationwide network, Verizon has applied its copper replacement strategy for the MDU markets.
In recent years, Verizon has been strategically replacing aging copper plant with fiber at its consumer and business locations. The service provider said that this method enables it to reduce costs by not having to perform multiple customer visits when problems arise.
Verizon has been replacing aging copper plant with fiber at its consumer and business locations. Fios to residential triple play customers was the first step, with fiber to commercial buildings and MDUs now well underway.
“At Verizon we were finding the trouble reports on the copper were two to three times more than when we had fiber to the living unit,” O’Byrne said. “For a long time, the copper plant in the Verizon network was not as good as it was in some locations so if we went to G.fast it would be low volume and we would have the same issues five years down the road.”
“We’re skipping XGS-PON single wavelength,” said O’Byrne. “We’re going for a 10G tunable laser solution.”
O’Byrne said driving costs lower and providing a unified architecture that’s inter-operable across multiple equipment vendors are key goals for their strategy. He also mentioned solutions that can maximize use of Verizon’s extensive and somewhat disparate outside wiring plant environment.
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The hardest part in delivering Gbps services to MDUs is the “home run” from the equipment room to each unit. A major driver for the development of G.fast was the desire of telcos to avoid expensive and complex cabling work inside MDUs. Standards representatives from service providers would often tell stories of customers declining fiber service after finding out that the technician would have to drill holes in their apartment or condo. The idea is to bring fiber to the equipment room, and to then use pre-existing cabling (twisted pair, or even coax) for the last hundred meters or so.
I have personal experience of the cabling of suburban Bay Area buildings. Older buildings (before 1995 or so) typically have one “copper” cable (with 2 twisted pairs) and one coax cable from the equipment/utilities room to each unit. Newer buildings mostly have 2 CAT5 cables plus 2-4 coax cables. Running new fiber cabling is not only labor-intensive and expensive, but it also needs to overcome aesthetics and architectural rules of HOAs and property management companies.
When I am reading that Verizon will not pursue G.fast, my interpretation is that they will not invest in delivering Gbps services to older MDUs. That would not be surprising given Verizon’s recent record of reducing investment in wireline.