Here is an interesting article from dslprime.com about Full-Rate/G.Lite chipsets (dual mode) vs. straight G.Lite chipsets (the cool thing is that Aware has both avenues covered!!), enjoy:
Chip Dance G.Lite alone or Multimode (G.Lite + Full-rate) G.Lite's on the way, but whose chips will serve it?
Many major companies (including Alcatel, Globespan, Orckit, Conexant, ADI and TI) now offer multimode chipsets (both G.Lite and full-rate), while others (Lucent, Centillium, Siemens, Itex) emphasize their chipsets designed to do G.Lite alone. The opinions on both sides are strong.
Doing G.Lite alone results in a smaller, simpler chipset, which has advantages in power, port density, and� cost. Most multimode chips draw 1-3 watts more power (including line driver), require more board space, and cost at least $2/port more. But G.Lite can't go faster than 1.5 meg, while full-rate can go as high as 7 or 8 meg. (The customer must be close to the CO and willing to pay the added price.)
Equipment manufacturers have made different decisions. Compaq and Dell have bought many of the quarter-million G.Lite chips shipped from Lucent, while IBM went with TI's multimode chips. The question the market will determine is how much the user will value the potential to go faster. Fewer than 10% of residential users today are willing to pay the premium for speeds greater than 1.5 meg, and those more than a mile from the CO won't be able to reach maximum speeds anyway. But often consumers want to keep their future options open, and hope one day to be able to upgrade. No one wants to buy a modem thinking they may have to throw it out if they go for a faster speed.
Each approach has strong partisans. Aidan O'Rourke of Broadcom supported full-rate, stating that "no provider will want to deploy technology, either at the CO or the customer premises, that will restrict the data-rates to below 1.5 Mbits/sec."�
Vic Jayasimha of ADI agreed, "It is difficult to imagine why COs would provision G.Lite when for a small premium in power and price, they could provision a full-rate/G.Lite combination."
Tom Brookes of Alcatel Microelectronics added "Telcos can protect their investment with full-rate." But Faraj Aalaei of Centillium counters "There are a number of problems with this pie-in-the-sky proposition. In exchange for the presumed future-proofing of the network, the network operator gets to buy more expensive equipment, which consumes 2 to 3 times more power, and takes a lot more room in the CO, cabinets and huts."
Craig Garen of Lucent added that "G.Lite is an inherently lower cost solution, notably less complex, so that price differences will open up over time, whatever the short-term pricing policies. Customers should be only sold what they need, rather than what's convenient for companies that want to leverage their full-rate products."
DSL Prime's phone lines and email have been burning since we started asking about this topic. Uwe Hering of Infineon/Siemens pointed out the simplicity and size of a G.Lite design allowed them to add features, such as voice on the same card. Lucent has announced a similar DSL + voice card. The smaller G.Lite footprint makes it easier do design a combination card, incorporating a home networking or ethernet interface.
Some applications, such as PC Card modems for portable computer, virtually require G.Lite. But Dan Arazi of Orckit "strongly believes that the market will demand upgrade to full-rate splitterless ADSL sooner than anticipated." Todd Andreini of TI "absolutely believes the market will require full-rate or an upgrade path." We have much more, including commentary from most companies above, here, and will have a full article for our print edition at the end of September. Because BA, BS, US West, MCI, Northpoint, Rhythms, and Covad have all told DSL Prime they will support G.Lite, we expect much more on this story.