& 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
Cisco's Conrad Clemson, recently promoted to head up the company's Service Provider Apps & Platforms developments, talks to Light Reading's Founder and CEO Steve Saunders about how he's bringing cloud video, mobile and virtualization together to empower network operators.
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
Heavy Reading: The Web-Scale View

1|18|17   |     |   (0) comments


At Light Reading's 2020 Vision Executive Summit in Rome, Heavy Reading's former chief analyst Patrick Donegan shared insight from the recent web-scale operators report, which featured research on how web-scale operators view the market, the best web-scale companies to ...
LRTV Custom TV
Cisco's Cloud Scale Networking: Automation, Virtualization & Simplification

1|18|17   |     |   (0) comments


Cisco's Sanjeev Mervana outlines the latest innovations in networking technology at CES 2017 in Las Vegas.
LRTV Custom TV
ADVA Talks Innovation & the Future of Networking

1|17|17   |     |   (0) comments


Ray Le Maistre and Christoph Glingener, CTO of ADVA Optical Networking, discuss the current state of the industry, cooperation and collaboration, open innovation and the future of networking.
LRTV Custom TV
Cisco's Infinite Video Platform

1|17|17   |     |   (0) comments


Cisco's Infinite Video Platform allows service providers to deliver broadcast-quality video over IP networks. Infinite video supports many devices, from 4K TVs to tablets to game consoles. Join Cisco's Rajeev Raman for a brief tour and live demo.
LRTV Interviews
Masergy: Ability to Adapt Key for NFV

1|16|17   |   6:40   |   (0) comments


Speaking at Light Reading's 2020 Vision in Rome, Masergy's VP, Global Technology, Ray Watson, said agility is key to providing the mix and match NFV-based services that are driving business for the managed service provider today.
LRTV Interviews
Equinix: The Data Explosion

1|13|17   |   4:16   |   (0) comments


At Light Reading's 2020 Vision in Rome, Eric Schwartz, president of EMEA, Equinix, talked about how Equinix is helping its customers manage the influx of data today, and how it's preparing for a future filled with millions of connected IoT devices.
LRTV Interviews
Heavy Reading: The Changing Data Center Landscape

1|12|17   |   6:05   |   (1) comment


At Light Reading's 2020 Vision event in Rome, Heavy Reading's Senior Analyst Roz Roseboro talks about how virtualization is impacting data center evolution and how that evolution is affecting the relationship between service providers, data center operators and public cloud providers.
LRTV Interviews
Boingo: Prepping for Millions of Devices

1|12|17   |   5:07   |   (1) comment


At Light Reading's 2020 Vision in Rome, Boingo's CTO Derek Peterson discusses how wireless operators will address the needs of low-bandwidth and high-bandwidth apps at the same time, the need for more MHz, the impact of IoT and more.
LRTV Interviews
Comcast Shows Off Gig Gateway at CES

1|11|17   |     |   (1) comment


With its largest presence at CES in years, Comcast took the wraps off its long-awaited gigabit gateway and a new platform for managing the home WiFi network. Light Reading Senior Editor Mari Silbey sat down with EVP Chris Satchell to discuss the latest Comcast advance, and met with VP of Product Strategy and Development Andrea Peiro to walk through a demo of the ...
LRTV Interviews
Colt: End-to-End Key for 2017

1|10|17   |   6:21   |   (0) comments


At Light Reading's 2020 Vision Executive Summit in Rome, Nico Fischbach of Colt said having a multi-carrier, end-to-end service proposition is going to be key for 2017 -- and SD-WAN is instrumental in making it happen.
From the Founder
Cisco's Clemson on Mobile Cloud Video

1|9|17   |     |   (1) comment


Cisco's Conrad Clemson, recently promoted to head up the company's Service Provider Apps & Platforms developments, talks to Light Reading's Founder and CEO Steve Saunders about how he's bringing cloud video, mobile and virtualization together to empower network operators. "If you think about where we're going… whether it's a mobile application, or a video ...
LRTV Custom TV
VMware Telco NFV Solutions – Preparing for 5G & IOT

1|9|17   |     |   (0) comments


Shekar Ayyar, EVP & Corporate Strategy/General Manager of Telco for VMware, discusses VMware's Telco NFV solutions role and foundation for the Imminent Arrival of 5G & IOT.
Upcoming Live Events
May 15-17, 2017, Austin Convention Center, Austin, TX
All Upcoming Live Events
Infographics
Hot Topics
A Women in Comms Glossary
Sarah Thomas, Director, Women in Comms, 1/18/2017
Next Plugfest Gets G.fast Closer to Market
Brian Santo, Senior editor, Test & Measurement / Components, Light Reading, 1/13/2017
TV's Paradox: No HDR Without 4K
Mari Silbey, Senior Editor, Cable/Video, 1/17/2017
Nokia CTO: 2017 Is the Year 5G Gets in the Field
Dan Jones, Mobile Editor, 1/19/2017
Cable Has One Thing Verizon Needs
Mari Silbey, Senior Editor, Cable/Video, 1/17/2017
Like Us on Facebook
Twitter Feed
BETWEEN THE CEOs - Executive Interviews
Light Reading founder and CEO Steve Saunders chats with Sportlogiq CEO Craig Buntin about sports data analysis.
Eyal Waldman, CEO of Mellanox Technologies, speaks to Steve Saunders, CEO of Light Reading, for an exclusive interview about the 100 GB cable challenge, cybersecurity and much more.
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.