Light Reading
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
Light Reading sits down at CES with the head of Cisco's service provider video business, Conrad Clemson, to discuss how NFV and cloud security relate to video, the challenge of managing 4K/8K traffic, the global expansion of Netflix and virtual reality.
Flash Poll
Live Streaming Video
CLOUD / MANAGED SERVICES: Prepping Ethernet for the Cloud
Moderator: Ray LeMaistre Panelists: Jeremy Bye, Leonard Sheahan
LRTV Custom TV
Join Us at the Digital Operations Transformation Summit

2|4|16   |   03:52   |   (0) comments


The Digital Operations Transformation Summit on February 21, 2016 at the Crowne Plaza Barcelona Fira Centre will bring together 50 senior executives to engage in a unique debate on the opportunities and challenges presented by the transformative evolving digital landscape. RSVP now at events@lightreading.com.
LRTV Custom TV
Making the Test: ADVA Ensemble Connector vs. Open vSwitch

2|4|16   |   01:28   |   (0) comments


Light Reading, in partnership with EANTC, recently tested ADVA's Ensemble Connector, which replaces open vSwitch and offers carrier-grade capability and interoperability. The test results strengthen ADVA's credibility as a provider in the virtualization space.
LRTV Custom TV
Bridging the Gap Between PoCs & Deployment in NFV

2|4|16   |   31:50   |   (0) comments


Charlie Ashton of Wind River presents the keynote at Light Reading's 2020 Vision executive summit in Dublin.
Between the CEOs
CEO Chat With Mike Aquino

2|3|16   |   17:34   |   (0) comments


The former CEO of Overture Networks, Mike Aquino, discusses why truly open virtualization solutions provide service providers with the greatest choice.
Shades of Ray
MWC: Buckle Up for 5G & the IIoT

2|2|16   |   02:28   |   (0) comments


This year's Mobile World Congress looks set to be a 5G land grab and a chance to get down and dirty with the Industrial Internet of Things (IIoT) – but what will the 5G discussions actually be about?
LRTV Custom TV
Case Study: Building China's Next-Gen TV Networks

2|2|16   |   5:01   |   (0) comments


With over 2 billion viewers worldwide, Shenzhen Media Group is one of China's largest content producers. By partnering with Huawei and Sobey, SZMG was able to modernize media operations with the Converged News Center, a production studio that is a model for next-generation workflows.
LRTV Custom TV
Quad Channel Modulator Driver with 46 Gbaud Capability from MACOM

1|28|16   |     |   (0) comments


MACOM's MAOM-003427 is the industry's first surface-mount modulator driver with 46 Gbaud capability to support next generation 200G and 400G applications.
LRTV Custom TV
Video Infographic: Validating Cisco's NFV Infrastructure

1|26|16   |   02:24   |   (1) comment


We all know that the network of the future will be virtual, but when will virtual become a reality? This video infographic covers the four key areas in which Light Reading, in partnership with EANTC, tested Cisco's NFV infrastructure: performance, reliability, multi-service capabilities and single pane of glass management.

For the full report, see

Between the CEOs
CEO Chat With Phil McKinney, CableLabs

1|22|16   |   13:36   |   (1) comment


At CES in Las Vegas, we met with Phil McKinney, CEO of CableLabs. Phil provides an update on the rollout of DOCSIS 3.1, his views on the future of open source and how consumer interest in virtual reality could affect network traffic.
Between the CEOs
Ericsson CTO on the Changing Telecom Market

1|21|16   |   10:26   |   (0) comments


At CES 2015, CTO of Ericsson, Ulf Ewaldsson, sits down with CEO of Light Reading, Steve Saunders, to discuss the changing telecom market, the new partnership with Cisco and the future of the telecom industry.
LRTV Interviews
Ireland's Data Dream

1|21|16   |   14:31   |   (0) comments


Host In Ireland president Gary Connolly tells Light Reading's Steve Saunders about the role Ireland is playing in hosting data for the world's largest organizations.
LRTV Custom TV
Brocade Keynote: Transitioning to the New IP

1|20|16   |   27:23   |   (0) comments


At 2020 Vision in Dublin, Andrew Coward, VP of Service Provider Strategy at Brocade, presents the transition to the New IP.
Infographics
Cisco's latest VNI numbers suggest the world will be using 366.8 exabytes of data on smartphones and Internet of Things devices, up from 44.2 exabytes, in 2015.
Hot Topics
Alphabet Is Serious About Google Fiber
Mari Silbey, Senior Editor, Cable/Video, 2/1/2016
Did Juniper Pay 'Peanuts' for BTI?
Mitch Wagner, West Coast Bureau Chief, Light Reading, 2/2/2016
Google's 5G Radio Ambitions Are Expanding
Dan Jones, Mobile Editor, 2/5/2016
How Data Center Outsourcing Fuels AT&T NetBond Growth
Carol Wilson, Editor-at-large, 2/3/2016
3.5GHz Startup Gets $22M for Small Cells
Dan Jones, Mobile Editor, 2/2/2016
Like Us on Facebook
Twitter Feed
Webinar Archive
BETWEEN THE CEOs - Executive Interviews
The former CEO of Overture Networks, Mike Aquino, discusses why truly open virtualization solutions provide service providers with the greatest choice.
As anyone who knows me will tell you, I like to think I know a fair bit about this next-gen-comms malarkey, but there's nothing like an interview with one of the ...
Animals with Phones
Happy Groundhogs for Technology Day! Click Here
Live Digital Audio

Broadband speeds are ramping up across Europe as the continent, at its own pace, follows North America towards a gigabit society. But there are many steps to take on the road to gigabit broadband availability and a number of technology options that can meet the various requirements of Europe’s high-speed fixed broadband network operators. During this radio show we will look at some of the catalysts for broadband network investments and examine the menu of technology options on offer, including vectoring and G.fast for copper plant evolution and the various deployment possibilities for FTTH/B.