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Intrinsic Value is all-important and is the only logical way to evaluate the relative attractiveness of investments and businesses.
Greetings and welcome to MaxLinear 2017 Q4 Conference Call. At this time, all participants are in a listen-only mode. A question-and-answer session will follow the formal presentation. [Operator Instructions] As a reminder, this conference is being recorded.
I would now like to turn the conference over to your host, Gideon Massey, Investor Relations. Thank you. You may begin.
Thank you, operator. Good afternoon everyone and thank you for joining us on today's conference call to discuss MaxLinear's fourth quarter 2017 financial results. Today's call is being hosted by Dr. Kishore Seendripu, CEO; and Adam Spice, CFO. After our prepared comments, we will take questions.
Our comments today include forward-looking statements within the meaning of applicable security laws, including statements relating to our first quarter 2018 revenue, gross margin, operating expense, tax expense, tax rate, and interest and other expense guidelines as well as statements relating to trends, opportunities and uncertainties and various product and geographic markets.
These forward-looking statements involve substantial risk and uncertainty, including risks arising from competition, average selling price trends, and numerous other risks outlined in our SEC filing. Actual results may differ materially from currently forecasted results.
For a detailed discussion of the risks and uncertainties potentially affecting these forward-looking statements, we encourage investors to review the section of our SEC filing captioned risk factors and our previously filed Form 10-Q for the quarter ended September 30th, 2017, and our upcoming Form 10-K for the year ended December 31st, 2017, which we expect to file later this month.
Any forward-looking statements are made as of today and MaxLinear has no obligation to update or revise any forward-looking statements. The fourth quarter 2017 earnings release is available in the Investor Relations section of our website at maxlinear.com.
In addition, we report certain historical financial metrics, including not revenues, gross margins, operating expenses, income or loss from operations, pretax margin, effective tax rate, net income or loss and net income or loss per share on both GAAP and non-GAAP basis.
We encourage investors to review the detailed reconciliation of our GAAP and non-GAAP presentation in the press release available on our website. We do not provide a reconciliation of non-GAAP guidance for future periods because of the inherent uncertainty associated with our ability to project certain future charges, including stock-based compensation and its associated tax effects.
Non-GAAP financial measures discussed today do not replace the presentation of MaxLinear GAAP financial results. We are providing this information to enable investors to perform more meaningful comparison of our operating results in a manner similar to management's analysis of our business.
Lastly, this call is also being webcast and a replay will be available on our website for two weeks.
And now, let me turn the call over to Kishore Seendripu, CEO of MaxLinear.
Thank you, Gideon and good afternoon everyone. Thank you all for joining us today. We are pleased to report Q4 2017 revenue of $113.7 million, which is up 31% year-over-year and flat quarter-over-quarter. During Q4, we witnessed strength in both connected home and industrial mark-to-market revenues, which were offset by weakness in infrastructure application.
In 2017, we posted a record annual revenue of $420.3 million and delivered non-GAAP growth in operating margins consistent with our long-term target model, which included the FX of two acquired businesses with historically lower margin than marketing its target levels.
I would like to note that Q4 2017 brings to close one of the most transformational years with MaxLinear. During 2017, we started to realize the benefits of our strategic initiatives related to market diversification and target market expansion, which we embarked on a few years ago.
In 2017, our infrastructure business grew by more than 90% year-over-year, which offset a double-digit decline in connected home owing to a $65 million revenue headwind from legacy Entropic revenues.
We also added significant revenue diversity with the addition of Exar site performance analog products, consisting of power management and interface product serving industrial and multimarket application.
Based on Q4 2017 results; connected home infrastructure and industrial and multimarket contributed approximately 58%, 19% and 23% of overall revenues, respectively. We expect our revenue diversification to continue, aided by anticipated strong infrastructure growth driven by our industry-leading five products for cloud, data centers, and 4G, 5G, wireless networks.
Undoubtedly, 2017 was a significant year in the company's history for both engineering execution and market expansion perspectives. Our organic strategic development achieved significant milestones. We started mass production of the industry's first 28 nanometer CMOS RF transceiver, spanning the five to 45 gigahertz frequency range adjusting the microwave wireless backhaul market.
We taped out a recent example, the industry's 400-gigabit per second PAM-4 SerDes optical IT device our Telluride platform for the hyper-scale cloud system data market. With the sampling of our Telluride platform, consisting of the 400-gigabit PAM-4 DSP plus integrated driver and GIA solution, we believe we are in a leadership position to address the next major inside the data center upgrade cycle for data speed and capacity.
We also taped-out the industry's first Full Duplex or FDX Cable fiber node infrastructure remote PHY system-on-a-chip device, which will enable 10 gigabits per second data read services over coaxial cable or cable MSOs subscribers.
In addition, we have secured Tier 1 OEM engagements for our Blackcomb 40-nanometer CMOS massive MIMO wireless access radio solution targeting 5G macro base station and 5G active antenna array systems. In wireless infrastructure, we are making great progress towards becoming the end-to-end network infrastructure solution provider for 5G wireless rollout.
At the 2018 Mobile World Congress this month, we have several joint customer product announcements and demonstrations relating to wireless access, front haul, and backhaul solutions for 5G wireless network infrastructure deployment. These include our five gigabits per second next-generation modem SoC for 5G wireless backhaul and front haul transload using the microwave frequency band, our 20 gigabits per second virtual fiber Ethernet Modem SoC, which allows operators to use cheaper and more readily available coaxial cable in place of deploying expensive new fiber for emerging 5G wireless front haul applications and the MXL 210x wireless RF transceiver plus modem single-chip providing point-to-point, 2.5 gigabits per second connectivity link using MaxLinear's AirPHY technology, which sold both the link budget problem as well as the self-insulation challenge at home to enable fixed broadband wireless access to the home.
As you can see, we are really excited by our expanding technology footprint, we solidify our position as one of the industry's leading CMOS analog and mixed-single communication IT platforms.
Moving on to some of the fourth quarter's notable business highlights. Our connected home revenues increased approximately 1% sequentially, generally consistent with seasonal patterns.
Within our connected home, cable data stepped up after a seasonally weak Q3, accompanied by strong golden satellite digital outdoor shipments to international operators, along with continued growth in G.hn home connectivity and seasonal strength in hybrid TV tuners.
These strengths offset revenue weakness elsewhere in our connected home business. Specific to our connectivity portfolio, we have a strong growing design win pipeline for G.hn opportunities validated by a strong adoption of our Wave-2 Technology.
G.hn is emerging as a critical high bandwidth wired backbone connectivity solution, particularly outside North America across a wide range of telco, automotive, and industrial end markets.
Our infrastructure revenues were down 11% sequentially but grew by nearly 60% year-over-year on a quarterly basis. As stated earlier, for the full year 2017, our infrastructure revenue increased by more than 90%.
Our wireless infrastructure revenues were down in Q4 2017, owing to seasonality and weakness in telecom operator deployments. However, we are encouraged to see the first meaningful RF backhaul transceiver revenue from a Tier 1 OEM in Q4 2017.
We are in the early stages of increased industry activity leading into the 2019 5G wireless investment cycle. Between last mile wireline access infrastructure, namely c.Link and G.Now, retreated from record highs in Q3 2017 but experienced a strong 2017 overall.
In 2018, we expect strong growth in our last mile wireline access business. In our high-speed optical business, despite a strong Q4 relative to its slow Q3 base, the stagnant Chinese metro market and delays in the ramps of renewed TIA and driver design wins owing to excess inventory in the channel are proven to be revenue headwinds.
In the long-haul in metro optical market, we continued to broaden our portfolio to include 45 gigabaud and 64 gigabaud GIA end driver products and believe we are gaining customer design win traction relative to our competition.
While we are very excited about our growth prospects in infrastructure, many of our new initiatives are yet to ramp to critical scale and we are not immune to the timing-related uncertainties associated with large infrastructure buildouts. Lastly, our industrial and multimarket revenues increased 8% sequentially, driven primarily by strong demand across a broad range of interface and power devices.
We continue to believe that Exar provides the large and exciting opportunity to expand our content across a range of communications and industrial and multimarket platforms. We expected to prove to be an ideal vehicle for continued end market diversification as well as serve as a conduit to increase silicon content on our existing platforms.
With that, let me turn the call over to Mr. Adam Spice, our Chief Financial Officer, for a review of the financial and our forward guidance.
Thank you, Kishore. I'll first review our Q4 2017 results and then briefly discuss our outlook for Q1 2018. Our revenue of $113.7 million, GAAP and non-GAAP gross margins for the fourth quarter were approximately 45.8% and 62. -- 62% of revenue, respectively. This compares to GAAP gross margin guidance of 47% and non-GAAP gross margins range of 61% to 62%.
The underperformance relative to the GAAP guidance was due to the higher than estimated acquisition purchase price accounting impacts and the overachievement of the midpoint of our non-GAAP gross margin guidance was due to increased supply chain efficiencies.
The delta between GAAP and non-GAAP gross margins in the fourth quarter was primarily acquisition-related, reflecting the amortization of $9.7 million of inventory step-up, which was completed in Q4, $8.5 million of purchased intangible assets, $100,000 depreciation of stepped up of acquired asset, and $100,000 of stock-based compensation and stock-based bonus accruals.
Q4 GAAP operating expenses were approximately $57.8 million, which was $800,000 above the GAAP guidance with the overage primarily related to the Exar acquisition-related restructuring charges and higher prototyping costs and activities related to the sampling of our 400 gigabit per second PAM-4 SerDes device.
GAAP operating devices included amortization of purchased intangible assets of $8.9 million, stock-based compensation and accruals related to our stock-based bonus plan of $7.5 million and 2. -- and $2 million, respectively, $800,000 in restructuring charges, $300,000 in depreciation related to the step-up in acquired fixed assets, and $100,000 for acquisition and integration costs. Payouts under our 2017 performance bonus plan are expected to be settled primarily in shares of MaxLinear stock, which are expected to be issued in Q1 2018.
Non-GAAP OpEx was $38.3 million, slightly above our prior guidance of $38 million and up approximately $400,000 sequentially, with a slight overage to our guidance related to higher productivity expenses related to the previously referenced 400 gig PAM-4 SerDes device.
Rounding out our commentary on operating expenses, at the end of the fourth quarter 2017, our headcount was 753 compared to 772 at the end of the third quarter 2017. We continue to evaluate our staffing levels globally, particularly following our recent acquisition activity to strike a balance between driving near-term operating leverage and staffing key long-term growth initiatives.
Moving to the balance sheet and cash flow statement. Our cash, cash equivalents and restricted cash balance increased $300,000 to approximately $74.4 million. Our ending cash position reflects the effect of $20 million in debt prepayments during the quarter towards our term loan. When including an additional $10 million prepayment that was made earlier in Q1 2018, it brings the total prepayments to $80 million so far and brings our loan balance down to $345 million.
Our cash flow generated from operating activities in the fourth quarter of 2017 was approximately $21.7 million versus $37.7 million generated in the third quarter of 2017. The sequential decline in cash flow generated from operating activities was largely attributable to less revenue linear in the quarter and decreases in referred revenue resulting from the increased distributor channel sell-through and a catchup in a large customer's rebate payments that were accrued for, but unpaid at the end of Q3 due to that customer's internal processing delays.
We continue to focus on deleveraging aggressively, targeting an operating cash balance approximately $75 million with any excess cash generation above this level deployed towards debt payment.
Our days sales outstanding for the fourth quarter was approximately 53 days or eight days less than the prior quarter. Our inventory turns increased to 4.2 in the fourth quarter compared to 3.5 turns in the third quarter and our focus of ongoing Exar integration efforts to better align with MaxLinear's target model of approximately six inventory turns.
That leads me to our guidance. We expect revenue in the first quarter 2018 to be in the range of $110 million to $114 million. Built into this range, we expect connected home revenues to increase approximately 1% sequentially and account for roughly 61% of overall revenue.
Contribution from infrastructure to decline approximately 1% to represent 19% of overall revenue and industrial and multimarket to be down approximately 13%, contributing approximately 20% of overall revenues.
More specifically, within connected home, we expect cable data, cable video, and G.hn connectivity to be up sequentially, offsetting declines across satellite and Terrestrial TV Tuner solutions.
Within infrastructure, we expect sequential growth to resume in wireless backhaul which will be more than offset by declines in optical, given persistent China macro issues as well as softness across a range of power and interface applications.
Within industrial and multimarket, we're witnessing general softness across a range of power management and interface solutions. We expect first quarter GAAP gross profit margins to be approximately 54% of revenue and non-GAAP gross profit margins to be approximately 63% of revenue.
As a reminder, our gross profit margin percentage forecast could vary plus or minus 2%, depending on product mix and other factors. We continue to fund strategic development programs, targeted at delivering attractive topline growth as we look forward in the first half to 2018 and beyond, with a particular focus on infrastructure initiatives and our goal of increasing the operating leverage in the business.
As such, we expect Q1 2018 GAAP operating expenses to decrease approximately $1.3 million quarter-on-quarter to approximately $57.5 million, with the largest decreases coming from lower restructuring and amortization of intangibles and accruals of performance-based activity.
We expect Q1 2018 non-GAAP operating expenses to be up $1.2 million sequentially to $39.5 million with increases driven by seasonal payroll track sanctification step-ups, partially offset by lower projected advertising expenses. We expect GAAP tax expense to be approximately $500,000 and a non-GAAP tax rate of 7%. We expect interest and other expenses in the quarter to be $4.2 million.
In closing, we're pleased to announce Q4 2017 results, a quarter in which we delivered year-on-year revenue growth and produced $21.7 million in operating cash flow, which enabled the further $20 million of deleveraging.
As we look back at 2017, we're encouraged by our ability to whether the legacy Entropic related revenue declines and China macro headwinds in the optical market, while adding strategic technology platforms and high-performance analog and G.hn to our corporate development efforts.
As noted earlier in our markets, we're excited about our growth prospects across a range of markets, but we are in the early stages of any of these growth initiatives and predicting structure ramp timings can be challenging at best.
As a management team, we're committed to practicing continued restraint on near-term expenditures to ensure maintaining strong cash flow generation and to preserving operating leverage in 2018 as we progress to our ongoing transformative investment in growth process.
As we move forward in 2018, we're encouraged by the diversity and depth of our product portfolio as well as the continued efficient acquisition that our comp company has demonstrated.
We remain confident that our recent acquisitions, combined with organic initiatives related earlier uniquely MaxLinear shareholders to benefit from the growing demand for bandwidth across consumer, connected home, wired and wireless infrastructure networks, and a diverse growing demand for high-performance analog and mixed-signal solutions across industrial, automotive, and the multimarket applications.
And with that, I'd like to open the call to questions. Operator?
Thank you. At this time, we will be conducting a question-and-answer session. [Operator Instructions]
Our first question comes from Ross Seymore from Deutsche Bank. Please proceed with your question.
Hey guys, thanks for letting me ask the questions. I guess the first one is what's going on in the industrial and multimarket business? We haven't really had to deal with the seasonality of that before, but the down 13% guidance is a bigger step down than I would have expected. So, any color there would be helpful.
Hey, Ross. This is the -- the results are new category for us, the industrial and multimarket, so we are told there's some seasonality in the business, but given the nature of the business, so much of it goes through distributors. It's very hard for us to see this as anything but a seasonal impact rather than any end market demand issues.
So, we don't worry that it is down as we have talked about it. However, it's also new for us, but we don't see any end market issues other than the fact that it's a new business for us.
And I guess as my follow-up, you mentioned a couple different times about the difficulty in projecting the infrastructure side with these big projects and I think all of us appreciated it. But is there -- I guess what's the underlying tone that you're trying to convey there? Is there something has changed in that segment of your business as you look for 2018? Or is it just something where you're being more prudent after what happened in the high-speed interconnect market in aggregate, nothing specific to you guys in 2017?
We have been very cautious, of course, and there are two elements to our infrastructure business, right? One is the optical side of the business and on the other part of the business is the wireless infrastructure backhaul business. And then we have our wireline last mile access infrastructure business.
If you look at those three elements, they're different; however, the wireless infrastructure business and the wireline access business have a number of customers leading to ramp to new product designs in 2018 and through 2019. So, given the number of rooms that are at various customers, we're being very cautious because in the past, they have moved on the optical interconnect side, obviously, what's happened to the China telecom market on the optical side is still quite stagnant -- the market is, and we are not seeing yet any relief there.
However, the big movement for us is an opportunity to be the leader in the 400-gigabit per second data center market by being the first provider and sampler of a really working silicon.
And that, if everything goes well, starts ramping really at the end of this year. However, there's a slim possibility that moves to the beginning of the next year. So, those are dynamics and we're being cautionary about the market because there are so many product trends involved.
Yes, Ross and I would add some of that too. I'd say that we also comment on fact that we're early in the phase for a lot of these initiatives for ourselves. And so we're -- we have a little more lumpiness to our businesses, we don't have enough customer diversity yet to kind of whether when one customers starting to ramp and then made pause for a little bit before the other one begins their ramp.
So, I think there's a function of markets take longer and then it takes a while to build up some customer diversity to give you some predictability to revenue forecasts. And I think also I would also -- we also deal with some competitors in our market that tend to be a little bit more aggressive on when these markets are going to be develop. And I think you can attest over the years that we tend to be pretty conservative when it comes to predicting when the real need of the curve happens in these markets, and we don't want people to that necessarily expect -- put the ramps that we think are realistic.
So, again, I think some of our competitors may be a little bit over their skis [ph] as far as the timing of these new major technology ramp timings and we're just trying to be a little bit more conservative.
And I guess one follow-up on that is just that competitive landscape, Kishore that you see on the single lambda PAM-4; I know you guys were tapping that out either late last earlier this year, so just talk about your progress in that? I know you can't control exactly when the customers are going to ramp it, but how did the tape-out go? And how are you feeling about the competitive landscape in that market?
We are really excited. I think we have made good on our promise that we'll be the first one with the real product meets the power and performance requirement of a very stringent, standard for QSFP-DD and OSFP sockets. But we are -- all our Tier 1 and optical module partners and their customers are all engaged in the ecosystem. We have sampled the product. We have looked through performance that indicates the right bandwidth. We're feeling very, very good, and we are very optimistic when I say this right now, that for the OSFP, we should be able to show you some good product performance.
Actually we're very excited not only because of the 400-gig market. There was an enormous amount of risk we have taken when we entered this market. We were the ones who are being the most aggressive that the leapfrog technology is really 400-gig, not some intermediate points with 100-gig and 400-gig, and I think we'll be able to validate what we set out on, and we're -- right now we feel we're in the frontrunner status with this active hyper-scale data center market for 400-gigabit between speeds between servers, racks, and routers.
Okay. Thank you.
Our next question comes from Gary Mobley from The Benchmark Company. Please proceed with your question.
Hi guys. Thanks for taking my questions. Speaking of your three pillars of long-term infrastructure growth, I was hoping that you could share with us or expectation for revenue contribution for the cable fiber node product. And then related to ASC 606, can you remind us what percentage of revenue goes to distribution channel? And whether or not there's any revenue benefit in your Q1 guide from revenue recognition change based on the cell into the channel?
So, the first part of the question, Gary, was for you what is the various related contributions for our infrastructure revenues from the three pillars of growth we have talk about. One is wireless infrastructure; the other one is optical data center market, and the third one is the wireline last mile access, here its cable fiber node Full Duplex modified chip.
So, if you really look at these three products, while I cannot talk to you about the immediate relative contribution, but I can speak to you in the -- when the product cycles are fully set in, right?
We expect our wireless infrastructure revenues over the next three to five years to grow somewhere between $100 million and $200 million. Our cable fiber node product really is somewhere between $50 million to $100 million and our optical should also be in the range of about $100 million to $150 million revenues for data center. So, those are the relative size of these markets. So, you can think about wireless in the really long-term being the number one, data to the market being a close number two, and the cable fiber node being a solid $50 million to $100 million contributor, depending upon market share and our success in being the leader in the marketplace.
Having said that, we also taped-out our cable fiber node product in Q4 last year and it's actually right now, in the lab, and we're going to commenced testing. And this product being successful in being able to demonstrate the Full Duplex fiber node capability will be, by far, the leader in making the cable fiber node for 10-gigabit per second data services for cable MSOs a reality in the very near future.
Okay. Gary if that answers your question on the fiber node, I'll take your 606 question.
Sure.
So, 606 is -- a percentage of revenue that goes through distributor, it's about -- call it the mid-20% -- mid -- okay, I'd say 25% to 27% of revenue goes through distributor. And if you think about the impact for Q1 of 606, yes, there certainly is a possibility for more -- for some benefit from a channel refill.
I would think, obviously, given the way that 606 treats what would have been deferred revenue on the balance sheet going into 2018, it certainly was motivation for us to lean down the channel going into the end of the year because any of that deferred revenue that remained on the balance sheet at the end of the year, whatever we recognize was revenue, when it ultimately did ship through, because as you recall, MaxLinear has been on a sell-through model; in the 606, we move to a sell-in model.
So, yes, there probably will be some channel refill opportunity in Q1, but we think it's a relatively short-lived and probably relatively minor impact. It's not that big, so I don't think it's a real needle-moving event for--
Okay. Just to be clear on that that benefit, if any at all, is not included in the guidance?
I would say we took a very neutral view on whether or not the 606, kind of, channel refill impact would really kind of move needle for us in Q1. So, I would say we took a balance view that there might be you, but really not a lot.
Got you. Okay. Thank you, guys.
Our next question comes from Tore Svanberg from Stifel. Please proceed with your question.
Yes, thank you. I just wanted to follow-up on the infrastructure and I perfectly understand the conservatism, but just wondering with some recent conversations you've had with customers, especially given the new tax policy, and so on and so forth, would you say that there's a little bit more discussions now for infrastructure deployments?
So, Tore, you asked a very really, really macroeconomic question. We do not have those kinds of conversations with our customers. We settle really what I call very nerdy, analog, mixed-single communication DSP products, and we're typically not in conversations with CFOs or our customers.
So, I would like to say that that's true, they're going to invest more because of the tax policies, but at our levels of conversation, we're really focus on performance and platform opportunities and timing of brands.
Yes. One thing I can say is, we've talked about this before. We've definitely seen a lot more activity around our infrastructure initiative, particularly around this 400-gig PAM-4 opportunity. I would say, as you know, historically MaxLinear has not been a field of dreams company where we build it, they will come, but there was a little bit of that with this PAM-4 because it was a strategic new focus for us as a company and we were a new entrant to the market focused on the metro and the long-haul through acquisition of Physpeed.
And so for us, we needed to lean forward and take a few gambles on this marketplace, and I would say that over the course of the last six to nine months, customer engagements -- or perspective customer engagements have really ramped up quite a bit and, particularly after we now sample the product, I think that's taken another level up and activity and interest. And I would say it really confirming and validating the risk that we took when we decide to lean forward and invest in this market as [Indiscernible] we did and end up being what appears to be a first-to-market with the [Indiscernible] solution as Kishore mentioned earlier
So, I think that's really what we're more focused on than kind of -- we don't see, as Kishore said, really these macro level impacts of increased domestic investment, it's really more product and project-focused on that we have certainly seen a very significant step on the activity strictly related to the PAM-4 and also for the -- our wireless optic, particularly the 5G massive MIMO antenna array and so forth. So, we feel very comfortable about those signs of investment growth for us. Please go ahead.
That's fair. And a follow-up on Telluride. So, what are going to be some of the tangible milestones that we should track, obviously, you're sampling the product now, you talked about OFC, but as we move throughout the year, what are going to be some of the milestones? And will you, at all, be able to actually announce design wins for this product?
Very good question Tore and let me walk you through what will be tangible milestones. We hope and expect that you guys will come to our OFC booth and we can actually show a light entering the device, coming out the device, the right bandwidth and data rates. That will be the first big milestone.
And we will have press releases regarding the subject. Not only about our PAM-4 DSP and integrated drivers, but also our companion TIA device. So, you'll see the full menu of demonstration and you will be hopefully able to go to one or two main module maker -- optical module makers and see a demo of -- in a form fit function of an OSFP and QSFP-DD functions. They are working very vigorously on that right now.
The next step beyond that is obviously some level of customer-related product finish or entry or ramp announcements that really will happen probably towards the end of the year, not any time now.
However, there's a good chance that we may announce a partnership across an optical module maker and to the -- all the way to the end network systems provider. So, that's what we're working on right now. So, I would say those are the major milestones on the 400-gig PAM-4 product deployment from MaxLinear.
Very good. And my last question is on connected homes, so I know historically you've targeted this to be sort of high single-digit or 10% growth segment for you. As we look at 2018, are we thinking about that in the same vein? And you haven't mentioned DOCSIS 3.1 yet, so I was just wondering if you could just add some color on your growth prospects for connected home this year?
One thing just to clarify little bit Tore. I think in our recent investor presentations, we've modified that connected home growth to more like 5% to 10% is the range that we've taken. And part of that is just because of the uncertainty, again, of the ramp timing and things like DOCSIS 3.1. But also I think it's really more of a function of the fact that we've grown a fairly significant satellite business. And as we all know, satellite -- the domestic satellite market is definitely having some challenges as far as subscriber losses and so forth.
So, I think that's partially what informed our, kind of, taking the range from 10% or the spot to 10% down to a range of more 5% to 10%. And right now, I don't think there's any reason at this point in the year why we would change that view of what that range should be for the connected home. Because again, we do have -- the DOCSIS 3.1 should be a good space for us because of our competency in 3.0. Combined that with a nice growth that we talked about coming from our G.hn acquisition that Kishore mentioned earlier.
I think that the more question mark in that connected home portfolio is really the satellite, which is more macro-driven and of course, we've also -- we've talked in the past also about some operator on and off again behaviors with the MoCA deployment. So, I think hopefully that provides some context, and Kishore, you want to add?
Absolutely. That's absolutely correct. And I just want to point out DOCSIS 3.1, the reason we didn't mention it here is because, while DOCSIS 3.1 ramps should be starting in earnest, they are not as far along as they should be.
However, from MaxLinear's perspective point, the ramp you're talking about is at a major operator, right, cable operator, and for us, that's a very neutral effect on our shipments because we're such a large incumbent in DOCSIS 3.0.
The start of a DOCSIS 3.1 ramp at this particular operator is not a very revenue meaningful event. However, when the revenue on DOCSIS 3.1 ramps with some other operators, outside of the biggest operator in North America, we should see some ASP pickup and that should help grow our revenues related to cable DOCSIS.
Sounds good. Thank you.
Our next question comes from the line of [Indiscernible]. Please proceed with your question.
Hey guys, its David Haberle on behalf of Chris Rolland. Thanks for taking our question. Maybe just to piggyback off of that last thought on the DOCSIS 3.1 transition. Can you talk about -- you said you're very early with the largest customer, have you experienced any inventory build from them at all? Is that a contributor in 4Q or 1Q here?
I think you touched upon a very interesting topic of inventory, so I cannot comment about inventory buildup by the customer. We did ship reasonable amount of backlog for this particular customers and -- but we're not seeing throughput at the rate we would expect normally.
However, it has created some level of uncertainty about the amount of inventory that we would normally see in the channel for DOCSIS 3.0 and that's also tempering our forecasting process.
So, yes, we're midst -- in the middle of a transition of 3.0, 3.1 and the -- and what I call the non-spontaneous ramp to 3.1 has created some level of inventory transition uncertainties that is affecting our guidance as well. So, I think that's a fair question. But I don't think there's an excess inventory buildup.
You must keep in mind that there are two big vendors on the OEM side for the North American DOCSIS 3.1 market, so what affects us may not affect the other companies and vice versa. So, I think we're good with where we're positioned today.
Got it. Thank you. And then just to change gears real quick to the force-touch edge sense business that you guys have. I think last quarter you mentioned it was mainly one design win that was driving the revenue there, but that you had other design wins that will ramp. Do you guys have any better line of sight and visibility of when those ramps might occur? And then also, can you give us a sense if those design wins are with that same OEM or different OEMs?
Yes, David, I'm glad you asked this question about the Force Touch. I think it's very well known that our Force Touch design wins our phones have been in the market have been with HTC, and you have heard recently that HTC sold off a bunch of business to Google, and so that's created some uncertainty to what HTC's future plans are.
And the problem with a smartphone business has always been that way, right, and that's the reason we have become such a strongly operator and infrastructure-focused company and industrial multimarket focused company. And that's at the heart of our transition when long ago a consumer company to know where we're positioned ourselves.
On the other hand, we've had a couple of other design and prospects in progress on the OEMs, but I'm still not confident to tell you that we have won those sockets because the nature of the Force Touch feature is such that it's a feature -- and phones -- generally the feature that's nice to have and it could come in or -- and stay or it can be removed at the last minute. So, -- and we have seen some level of skittishness on the OEMs and how they function.
And more importantly, we are seeing a level of consolidations in the phone that is not necessarily obvious to the larger world, but there is a certain level of consolidation going on in the phone makers. And -- so we are feeling pretty cautious about what I call emphasizing Force Touch as a growth vector for us in this year or moving forward in the consumer handset market. Our hope is -- and if you're going to be investing in Force Touch really to expand its presence in the industrial multimarket applications.
All right. Got it. Thank you.
Our next question comes from the line of Quinn Bolton from Needham & Company. Please proceed with your question.
Guys, I just wanted to follow-up I think it was on Ross' question regarding the sort of weakness you're seeing in the analog side of the business, power management and interface. Did you say that this is just a seasonal pattern that you sort of anticipate every year? Or is this a broader and more macro-driven slowdown in that broad catalog business?
So, Quinn, I really cannot honestly answer that question with a statement that we know what's happening at the macro level. However, our understanding is typically there is a step down seasonality. However, we are yet to confirm that for ourselves because we have been in this position of this business for less than one year right now.
So, I wouldn't -- I would not stretch this to a macro impact. However, we see that this business, majority of it goes through distributors, so it's hard for us to forecast really direct and end customer demand to be able to answer your question.
Yes, thanks. I think I'll try for a little more color on that. So, I mean, as you know, it's very diversified business, right? So, there's a lot of different SKUs, a lot of different customers, a lot of applications, but if you really want to pick out the -- we talked about the questions raised earlier about HTC, so part of the challenge right now as we look into Q1 is softness on that Force Touch is that initial HTC design is getting a little bit, kind of, I would say aged, if you will. So, with -- that's probably I'd say the leading contributor to the drag in that multimarket and industrial guide for Q1?
And then just more broadly speaking on the industrial side, we're just seeing across a range of applications just a little bit of softness and it's difficult to forecast that business as well because it so -- just the forecast, you do have to rely on your distributors quite a bit more than what's kind of the -- I would say legacy method of bottoms-up forecasting by customer.
So, I would say if you want to point a couple more details again, it's more the HTC Force Touch impact in Q1 and then just broad-based kind of difficulty to forecast and when we can have as much granularity as we like to or we used to as management team, we tend to a more conservative approach to guidance.
Got it. You guys have any visibility into end customer inventory levels or does it kind of -- does your visibility stop with inventory held at the distributors?
Depends on our part of our business. If it's a direct business like MaxLinear platform business, this is already in the operator business, for example, in cable and satellite, we do make it a point to get direct information as much as possible fairly regularly about our OEM's inventory position, not necessarily the operator's inventory position.
However, in the Exar portfolio of catalog-ish analog products that go mostly through distributors, we really track the distributor inventory and we don't have much visibility to the end market inventory because it's really several thousands of customers are buying those components.
So, I think -- so if you look at -- at two-thirds or three-fourths of our business being more platform-oriented the way we track our OEM inventories. And then in the non-platform businesses where three distributor OEM, primarily Exar business, we only track distributor inventory.
I would say that in the three-fourth of the business that we have a direct knowledge off of the business, we do have a sense of inventory and is that what I call not away from the normal levels. So, -- because on an average, I think it's fine. It's definitely not low inventory levels, but it's not excessively high either. So, I think it's about normal.
Okay. Thank you for that. And I wanted to follow-up on a single lambda PAM-4, it seems like there's pretty widely reported delays now for Tomahawk 3 that could push out by as much as six, may be possibly even 12 months and that solution may not get into the market until sometime well into -- or systems-based on Tomahawk 3 well in the market until 2019.
And so I guess as you guys look at the rollout for single lambda PAM-4, you talked about possible shipments by the end of 2018, early 2019, what is the six or 12-month delay in Tomahawk 3 due to that business? I mean it seems like that's the big growth opportunity, because TIA's drivers, just seems like that's kind of a pretty challenged market and likely to remain so.
Quinn, very good question. I'm hearing for the first time about delays to Tomahawk. But firstly, I looked of the sampling of the Tomahawk 3, as you called it, at the end of last year, beginning of this year very, very positive. Firstly, that's confirmation that you do have about PAM-4 interface to raise the 400-gig PAM-4 chip getting into phase two. So, that's good news.
Secondly, production readiness, we have always assumed it's going to take at least 12 months and if it's delayed in terms of getting ready for production, that's one matter. The other matter is that the chip itself, Tomahawk switch chip, does it have issues?
From all accounts, I do not think it has issues. I'm not aware of any issues. So, if there are natural lead-time issues and getting ready for production, the best we can do is be prepared and ready to go to production and we will be.
Anyhow, there's a lead-time for optical manufacturers to get ready too as well in a sense that optical modules, the biggest -- the longest pole in production getting to production with the QSFP, OSFP chip module form factors is really the optics and it's not the silicon folks.
So, I feel that -- well the delays may delay our ramps on the PAM-4 400-gigabit per second single lambda chips, however, we need to do what we need to do to be ready so that we are not the gate to go into production at the end of the year.
Maybe a clarifications just on -- when you guys say for shipments or shipments in late 2018, early 2019, are those kind of production-ready -- is that a production rep or is that kind of the preproduction qualification units that are going out to the module guys and kind of establishing the ecosystem and that 12 months after those first shipments is what you would expect the volume ramp so you be kind of talking volume ramp in late 2019, calendar 2020 -- early calendar 2020.
Okay. So, let me talk of production ramp that is our production, silicon production rally, silicon production products being -- starting to ship in some level of volume quantity, what I call initial volume quantities.
Regarding product qualification, hopefully, our expectation is that we'll get that done before the end of 2018. Now, the -- our customer's product qualification could be dependent upon the optics also and the silicon-all assemble together and being qualified. That's a different qualification cycle than our own products being qualified and production-ready. We are on track to ensuring that we will be production-qualified and ready to go as far as silicon is concerned.
Got it. Thank you.
Hey, Quinn, this is Adam. Just to give you a little more color. We don't have a lot of revenue currently forecasted in our model for 2018 for Telluride, so that goes back to the commentary that we provided when Ross asked his question. We're very, very conservative.
So, a pushout of production of Telluride because of Tomahawk delays we're having really doesn't move the needle for us in 2018, right? So, it's -- we've been very conservative on the timing and that's why I said earlier, when I hear other people talk about ramps in the second half of 2018, other competitors talk about that, it just makes me a little bit nervous what other people might imply for ourselves because again we've never been saying that, right. We've been saying that we would start some shipments in the second half 2018 -- late second half 2018, but really wouldn't be needle-moving and our perspective has not change on that. We've always taken a more conservative stance.
Okay. Thanks Adam.
[Operator Instructions]
Our next question comes from the line of Tore Svanberg from Stifel. Please proceed with your question.
Yes. I just had some follow-ups and also some housekeeping once. So, first of all, G.hn seems to be doing really well for you and it's interesting, right because I've got investors talking about your China optical exposure, but G.hn business is probably three times the size of that, so can you just explain a little bit what's driving that adoption? And why you're seeing such strong momentum there?
First and foremost, G.hn is a -- addresses a large part of geographies in the world and because it works over powerline, coaxial and needless to [Indiscernible]. So, that's nice thing about it as compared MoCA which is purely coaxial cable and primarily North America.
So, on the G.hn side, there is what we call the last mile access related version called G.Now, which we referred to correctly as G.hn. And the G.Now is being used by telecom operators because G.fast that has not delivered the promise nor does it have the capability to provide the broadband from the -- for the last mile into the multi-dwelling unit.
And in China -- and in China and South Asia and whether it's Thailand or Korea and in other Asian countries, we are looking at G.hn or G.Now as a way to do the last mile access into multi-dwelling units.
So, that's a nice thing about it because typically in these countries, fiber comes all the way near the buildings, but once into the building, you really need something that's much more robust and G.Now provides a very cost-effective way of doing it.
Secondly, on the G.hn side, there are -- it is being used as a wired backbone for Wi-Fi coverage in the various countries in Europe and other Asian countries for Wi-Fi extenders. So, those designs are going on well.
And finally, you may have noticed that there's a big backing of G.hn from Huawei and other players in China, China Telecom players who are really showing a strong presence on the standards bodies and it really look at G.hn as a home networking standard wired connectivity inside the home, both for distributing video and also for extending Wi-Fi coverage inside the home, which is really terrible in China, for example.
So, those are the things that are really driving those -- the ubiquity of reception for deploying G.hn, not forget to mention you also have these utility companies that are using G.hn for metering applications, right?
So, I think just the range of applications that G.hn can address is the real feature behind it because it's readily available powerline medium throughout the world. So, I think it's quite exciting. And it's really going very strongly and in fact, we expect growth to continue into next year and the following year as well.
That's really helpful, Kishore. And just some housekeeping ones for Adam. So, Adam, high speed optical, China, I mean I think last quarter that was pretty low, is it still sort of sub 1%, 2% of revenue at this point?
Yes. Well, are you talking about Q4 or Q1 guide?
Q4, like doing your most recently reported quarter, was it still sort of in that 1% to 2% of revenue?
It was around -- yes, it was in the 2% to 3% of revenue actually in the fourth quarter.
Okay, that's helpful. And then also the legacy businesses, both video SoC and analog channels type switch, are they approaching zero now or just sort of 1%?
Yes, the video SoC was -- yes, we said was going to be bouncing around the bottom and that was around a little less than $1 million in Q4. And then the analog channel-stacking was almost zero.
That's very helpful. Thank you very much.
Ladies and gentlemen, we have reached the end of the question-and-answer session. And I would now like to turn the call back over to management for closing remarks.
Thank you, operator. As a reminder, we will be participating in the Morgan Stanley Technology, Media & Telecom Conference on March 1st in San Francisco and at the 30th Annual Roth Capital Conference on March 12th in Newport Beach, California, and the Susquehanna's 7th Annual Technology Conference on March 14th in New York. We hope to see many of you there.
With that said, we thank you all for joining us today and we look forward to reporting on our progress for the next quarter.
This concludes today's conference. You may disconnect your lines at this time. Thank you for your participation.