& cplSiteName &
Video

Why OTN Is Becoming More Important

5/19/2011
50%
50%
Newest First  |  Oldest First  |  Threaded View        ADD A COMMENT
Page 1 / 2   >   >>
amitawal
50%
50%
amitawal,
User Rank: Light Beer
12/5/2012 | 5:04:59 PM
re: Why OTN Is Becoming More Important


Yuu mentioned that OTN and SONET/SDH are both L1. They both use GFP for carrying (encapsulating) Ethernet. So why do you say that OTN is more effficient that SONET/SDH in carrying Ethernet?

tmmarvel
50%
50%
tmmarvel,
User Rank: Light Beer
12/5/2012 | 5:04:58 PM
re: Why OTN Is Becoming More Important


And whether with OTN or SDH, it's still TDM used for sub-packet-layer grooming (e.g. 10G feeds to/from "100G"), to achieve better jitter etc. performance and lower per bit cost than with any packet level switching. So what's the kicker with OTN?

ross.halgren
50%
50%
ross.halgren,
User Rank: Light Beer
12/5/2012 | 5:04:56 PM
re: Why OTN Is Becoming More Important


Packet services have all but killed TDM services at the end-user level (and rightfully so) but TDM is still important at the Service Transport level. Service capacity granularity and security has alot to do with this. Packetisation of services makes sense for the aggregation and switching of relatively low capacity and variable rate services at various levels, from the user-level up to the edge multiplexing and switching level. However, for service transport, where aggregated capacities are at least 1Gbps (or 10Gbps some would say), TDM still has a useful place for the Transport of multiple 1G and 10G service channels over a wavelength multiplexed transport network (from Metro to Long-Haul). This is because for 1-10Gbps service channels, the capacity is sufficiently large compared to the capacity of a wavelength (currently 100Gbps) that its granularity is "manageable" and because TDM separation of service channels provides another level of security for different service providers and high-end users that are sharing the same wavelength. In contrast, TDM has become impractical to manage for lower-level services having a capacity of 64kbps for example (eg, 100G would theoretically support over 1.5 million x 64kbps TDM services).


OTN and GFP / TDM multiplexing of high-capacity channels effectively provides a fully transparent sub-lambda transport layer within a wavelength-switched transport network. Given the above service evolution, OTN has become more important for the multiplexing and switching of 1-10G transport services within 40G and 100G wavelengths and OTN will retain its importance as wavelength capacities increase to 400G, although by then, the minimum transport service granularity is likely to increase to 10Gbps.

eylons
50%
50%
eylons,
User Rank: Light Beer
12/5/2012 | 5:04:54 PM
re: Why OTN Is Becoming More Important

OK, it is well understood that there are tons of circuits out there, and they will probably not disappear in the short term. Ethernet/MPLS/IP is indeed taking over but the very large SONET/SDH installed base will continue to enable TDM leased lines as long as it is profitable.

If we put voice aside, those TDM leased lines are many times Ethernet-over-SONET (or Ethernet-over-SDH) point to point secure and reliable service to enterprise customers. So in this example I would say that EoS service migration to packet solutions is simpler than OTN solutions. Packet solutions today present CoS/QoS as good as SONET/SDH solutions.

- Packet does TDM: with standard circuit emulation protocols (also for high capacity). At mobile networks, Packet does TDM (with SAToP/CESoP/etc.) as common practice

- OTN does packet: true, natively. But… native TDM support is built-in and therefore scaling up packet in OTN is challenging. Enabling 90% packet traffic over OTN – not so cheap and not so easy…

nelso53
50%
50%
nelso53,
User Rank: Light Beer
12/5/2012 | 5:04:54 PM
re: Why OTN Is Becoming More Important


Amitawal, the improvements OTN provides over traditional SONET/SDH platforms is phenomenal. Certainly one of the key improvements is scale when compared to legacy technologies like SONET/SDH. Take a closer look at all the capabilities of the respective provisioning platforms and I think you will have your answer.

OldPOTS
50%
50%
OldPOTS,
User Rank: Light Beer
12/5/2012 | 5:04:53 PM
re: Why OTN Is Becoming More Important


Packet over SONET (POS) is the most efficient method to transport packets over SONET systems. It does what ATM took advantage of and used wasted mapping & diagnostic space on SONET. But, other than this, the efficiency differences are very small between POS and other packet techniques, <1% tested under network conditions. About 15% better than pure SONET. And replacing existing SONET equipment (primaily muxes) is a large CAPEX cost.


And POS more importantly addresses the security/separation/COS issue as efficiently as possible!


OP


PS -Or is this a religious issue for a special case and not the ENTIRE network?? Do a network inventory of the entire used network and try to apply the solution if you think the end is near. Migration will occur, but only as CAPEX is available to service all parts of the network.


I was not origionally a fan of POS, but became so as the networks slowly migrated to more packet links.

sgan201
50%
50%
sgan201,
User Rank: Light Beer
12/5/2012 | 5:04:53 PM
re: Why OTN Is Becoming More Important


Hi,


 


When you say OTN, do you refer to GFP-T or GFP-F solution or both??


Thanks.


 


Dreamer

Sterling Perrin
50%
50%
Sterling Perrin,
User Rank: Light Sabre
12/5/2012 | 5:04:52 PM
re: Why OTN Is Becoming More Important


Amitawal,


Some people have already jumped in here, but I'll give you some of what I was thinking about when I made the statements:


1. the ability to scale is one big advantage. OTN is buit for wavelength-level capacaties, and at 100G there is no sonet/sdh standard at all. it is OTN.


2. the ODU0 granularity was built to match 1 GigE traffic, making OTN a fit for 1G, 10G, 100G, and beyond. 1G is a big deal because alot of aggregation networks are being based on 1Gig pipes.


3. ODUflex allows the size of the OTN pipe to be resized to closely match the capacity of whatever data rate is being used. And, with ODUflex with hitless adjustment, the re-sizing will be able to be done dynamically (on the fly) - making OTN look alot like Ethernet.


4. Synchronous vs. Asynchronous: this is a fundatmental difference between sonet and OTN, even though they are both TDM. I'm not sure that this directly contributes to efficiency in packets but it does appear to have an impact on cost.


Sterling

amitawal
50%
50%
amitawal,
User Rank: Light Beer
12/5/2012 | 5:04:48 PM
re: Why OTN Is Becoming More Important





My replies are inline:


-Amit


 


1. the ability to scale is one big advantage. OTN is buit for wavelength-level capacaties, and at 100G there is no sonet/sdh standard at all. it is OTN.


[Amit] True. True dream of OTN was line side multi-vendor interop but that hasn't been successful. And I'm wondering why do we lack 100G SONET/SDH standard? More than anything technical, my feeling is that this was not considered as there was so little market traction on STM-256.


2. the ODU0 granularity was built to match 1 GigE traffic, making OTN a fit for 1G, 10G, 100G, and beyond. 1G is a big deal because alot of aggregation networks are being based on 1Gig pipes.


[Amit]Yes. Isn't that inefficient though? The SONET/SDH pipes rarely need to carry full wire speed 1xGE. It is more often a fraction (atleast in the SDH market). Also full GE can be carried in VC4-8v and switched at that granularity as well.


3. ODUflex allows the size of the OTN pipe to be resized to closely match the capacity of whatever data rate is being used. And, with ODUflex with hitless adjustment, the re-sizing will be able to be done dynamically (on the fly) - making OTN look alot like Ethernet. 


[Amit] ODU flex is nothing but SONET/SDH VCAT + LCAS which enable same capability - hitless addition/removal of VC/VT in a VC Group. For bigger granularity, I'm wondering if there could have been a combination of contiguous & virtual concatenation. For example, to carry 4G worth bandwidth, a VC416c x 2v seems much simpler if there was standards direction towards it. Wouldn't this have been much better than evolving a completely different OTN switching? 


4. Synchronous vs. Asynchronous: this is a fundatmental difference between sonet and OTN, even though they are both TDM. I'm not sure that this directly contributes to efficiency in packets but it does appear to have an impact on cost.


[Amit]Note that many of OTN switching equipments also are supporting SONET/SDH switching. So there can't be any cost advantage for omitting supporting synchronization here. On the other hand, it can only lead to more complex ASICs and engg effort thereby increasing cost rather than reducing it. Is the real cost advantage a result of Moore's law or really Synch vs Async? 




tmmarvel
50%
50%
tmmarvel,
User Rank: Light Beer
12/5/2012 | 5:04:43 PM
re: Why OTN Is Becoming More Important


Any actual implementations (GA products / in-service networks) for "ODUflex with hitless adjustment"?



And is this different than SDH VCAT-LCAS (other than capacities)?

Page 1 / 2   >   >>
From The Founder
Kicking off BCE 2017, Light Reading founder Steve Saunders lays blame for NFV's slow ramp-up and urges telecom to return to old-fashioned standards building and interoperability.
Flash Poll
Live Streaming Video
Charting the CSP's Future
Six different communications service providers join to debate their visions of the future CSP, following a landmark presentation from AT&T on its massive virtualization efforts and a look back on where the telecom industry has been and where it's going from two industry veterans.
LRTV Interviews
Masergy: It's Time for SD-WAN Options

6|28|17   |   03:09   |   (0) comments


Paul Ruelas, director of network products for Masergy, explains how adding SD-WAN has changed the service mix for his company's customers. In some cases, the change is incremental, enabling more granular customer control. Masergy's newest version, SD-WAN Go, gives up some of those controls for a streamlined version targeting mid-sized customers with the most ...
Women in Comms Introduction Videos
Intel Ushers in the Revolutionary 5G Era

6|28|17   |   5:00   |   (1) comment


5G will bring job opportunities for women in telco and IT, as well as a whole new era of communications for consumers and industries of all kinds, says Caroline Chan, vice president and general manager of the 5G Infrastructure Division at Intel.
LRTV Custom TV
VeEX at ANGA COM

6|27|17   |     |   (0) comments


At ANGA COM 2017, Cyrille Morelle, president and CEO of VeEX, updates Alan Breznick with VeEX's new products and technology. This includes VeSion cloud-based platform for network monitoring, AT2500-3G advanced spectrum analyzer and MTTplus-900 WiFi Air Expert module. He also comments on DOCSIS 3.1 deployment and Remote PHY technology.
LRTV Custom TV
The Overall Objective Is to Win the Game

6|26|17   |     |   (0) comments


SCTE•ISBE's Chris Bastian discusses Energy 2020's success to date and the importance of a flexible approach that allows for changes in specific strategies in order to reach significant milestones.
LRTV Interviews
CenturyLink: Let's Get Past SD-WAN Hype

6|23|17   |   04:02   |   (0) comments


Technology becomes a "shiny object" unless it's properly focused on solving business needs for enterprise customers, says Bill Grubbs, network solutions architect for CenturyLink. He explains to Light Reading why SD-WAN deployments have to be tailored to specific needs – and more.
Women in Comms Introduction Videos
Infinera's Sales Director Paints Tech's Big Picture

6|21|17   |   4:14   |   (1) comment


Shannon Williams, Infinera's director of sales, shares how she achieves work's many balancing acts -- between her role and the broader company, today and tomorrow's tech and more.
LRTV Custom TV
SD-WAN Innovation & Trends

6|20|17   |     |   (0) comments


Versa CEO Kelly Ahuja discusses with Carol Wilson the current status and trends in the SD-WAN market, Versa's innovation around building a software platform with broad contextualization, and the advantages that startups can bring to the SD-WAN market.
LRTV Interviews
Ovum's Dario Talmesio on 5G in Europe

6|20|17   |   02:16   |   (0) comments


At 5G World 2017, Dario Talmesio, principal analyst and practice leader on Ovum's fixed and mobile telecoms European team, explains the emerging trends amongst European operators as they prepare for 5G.
LRTV Custom TV
Putting Power on a Pedestal

6|19|17   |     |   (0) comments


ARRIS's John Ulm says a major accomplishment of SCTE•ISBE's Energy 2020 program is increased focus on power cost and consumption, including inclusion of energy requirements in operators' RFPs and RFIs.
LRTV Custom TV
Gigabit Access: The Last-Mile Pipe for All Future Services

6|19|17   |     |   (0) comments


A Gigabit access platform being deployed today must be able to deliver all types of services to an increasing number of devices. A non-blocking architecture is necessary to support the ever-increasing growth in bandwidth demand. The Huawei Gigabit access solution is based on a distributed design that is fully scalable to deliver a unprecedented performance.
LRTV Custom TV
Key Factors to Successfully Deploy an SD-WAN Service

6|19|17   |     |   (0) comments


As service providers transition their SD-WAN solution from trials and limited deployments into production at large scale, there are important considerations to successfully operationalize these solutions and realize their full potential, without adding complexity, introducing uncertainty or disrupting current business operations. Sunil Khandekar, CEO and Founder ...
LRTV Custom TV
IoT Solutions: Rational Exuberance

6|19|17   |     |   (0) comments


IoT solutions are morphing from hype into viable business opportunities. Huawei has the platform and ecosystem support to help carriers successfully address new business opportunities in the IoT space.
Upcoming Live Events
October 18, 2017, Colorado Convention Center - Denver, CO
November 1, 2017, The Montcalm Marble Arch
November 1, 2017, The Montcalm Marble Arch
November 2, 2017, 8 Northumberland Avenue, London, UK
November 30, 2017, The Westin Times Square
All Upcoming Live Events
Infographics
With the mobile ecosystem becoming increasingly vulnerable to security threats, AdaptiveMobile has laid out some of the key considerations for the wireless community.
Hot Topics
No Imagination: UK Chip Biz Goes Up for Sale
Iain Morris, News Editor, 6/22/2017
Does AT&T Deserve Time Warner?
Mari Silbey, Senior Editor, Cable/Video, 6/23/2017
Verizon Takes 'One Fiber' to More Cities
Mari Silbey, Senior Editor, Cable/Video, 6/22/2017
AT&T Expects 5G in Late 2018 or Early '19
Dan Jones, Mobile Editor, 6/22/2017
European Broadcasters Team Up to Take Down Netflix
Aditya Kishore, Practice Leader, Video Transformation, Telco Transformation, 6/22/2017
Like Us on Facebook
Twitter Feed
BETWEEN THE CEOs - Executive Interviews
Following a recent board meeting, the New IP Agency (NIA) has a new strategy to help accelerate the adoption of NFV capabilities, explains the Agency's Founder and Secretary, Steve Saunders.
One of the nice bits of my job (other than the teeny tiny salary, obviously) is that I get to pick and choose who I interview for this slot on the Light Reading home ...
Animals with Phones
Live Digital Audio

Playing it safe can only get you so far. Sometimes the biggest bets have the biggest payouts, and that is true in your career as well. For this radio show, Caroline Chan, general manager of the 5G Infrastructure Division of the Network Platform Group at Intel, will share her own personal story of how she successfully took big bets to build a successful career, as well as offer advice on how you can do the same. We’ll cover everything from how to overcome fear and manage risk, how to be prepared for where technology is going in the future and how to structure your career in a way to ensure you keep progressing. Chan, a seasoned telecom veteran and effective risk taker herself, will also leave plenty of time to answer all your questions live on the air.