G.fast vs VDSL 35(b) VPLUS

Apr 15, 2023Confidential | SckipioSckipio

Technology Comparison VPLUS versus G.FAST

Apr 15, 2023Sckipio | G.fast vs VPLUS Comparison

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VPLUS (35b) vs. G.fast Comparison

Parameter G.FAST VPLUS (35b)

Bandwidth 2-106MHz, 2-212MHz (future) 2-35Mhz

Max Rate Up to 1Gbps with path to even faster future G.fast performance

Up to 400Mbps for 0m loops, no path to higher speeds

Down/Up ratio Configurable: 90:10 to 30:70 Fixed ratio

Complexity 2K Carriers (more efficient) 8K Carriers (results in 4x more memory required for vectoring)

Vectoring Designed to cope with the high FEXT level in the G.fast band

Designed for the low 17MHz VDSL frequencies. Significant performance loss when FEXT is high.

Customer Self Install

Likely – the huge rates leave margin for handling tough in-home networks

Unlikely – performance may drop under 17a rates

Openness 7 silicon vendors participate in the G.fast interop event (Plugfest)

Single vendor? No BBF certification plan

* Sckipio implementation


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G.fast vs. VPLUS 35b, downstream

• Huge advantage for G.fast for short lines. Similar performance if the target rate is limited to 300Mbps. Advantage to VDSL+ if the min rate target is 200Mbps (100m). No advantage for VDSL+ if G.fast can start from 2MHz.

0 100 200 300 400 500 6000

100

200

300

400

500

600

700

800

900

1000

Loop length [m]

Bit-

Rat

e [M

bps]

Downstream Rate/Reach

G.fast, 20-106

VDSL 35bVDSL 17a

G.fast, 2-106

300Mbps target

200Mbps targetC

A

B


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THINGS TO CONSIDER• Cost implications of multiple choices versus monopoly

– VPLUS is a single vendor solution. G.fast has 6 suppliers committed to deliver chips– Users will incur all the VPLUS+ R&D costs of VPLUS since very few other telcos

committed to it– VPLUS power issues may raise both OpEx and CapEx– Despite the increased bandwidth, G.fast should be lower price/port versus VPLUS

• Risks of technology lock-in– Risks with committing to a single management system, single system supplier, TR-69

fees, etc.– All the problems of VDSL remain, only V+ benefit is larger bandwidth. G.fast offers many

technical benefits beyond bandwidth– G.fast is an open management model – supporting SDN and open source components

• Ready for the cabinet– G.fast can and will scale. Expect affordable 48-96 ports, fully vectored in future– G.fast will be able to meet the rate/reach requirements – with lower radiation & power– G.fast can be integrated into existing management systems, but offers lower cost

alternatives such as Netconf/Yang and OpenFlow


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Summary

• Sckipio G.fast provides– Faster performance at virtually every distance

– Flexible Down/Up asymmetry ratio

– Substantially more robust with Robust Management Channel

– Superior vectoring robustness, adaptation and performance

– Open management framework

– Scales to whatever is needed (up to 96 ports is feasible)