Light Reading
Heavy Reading's Sterling Perrin says OTN carries packet traffic better than a packet-based system can handle TDM traffic. Do you agree?
Video

Why OTN Is Becoming More Important

50%
50%
Newest First  |  Oldest First  |  Threaded View
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   >   >>
Educational Resources
sponsor supplied content
Educational Resources Archive
Flash Poll
From The Founder
It's clear to me that the communications industry is divided into two types of people, and only one is living in the real world.
LRTV Custom TV
Using Service Quality to Drive WiFi Monetization

10|22|14   |   6:51   |   (0) comments


Live from the SCTE conference: Heavy Reading's Alan Breznick explores the forces shaping the WiFi opportunity in an interview with CableLabs' Justin Colwell and Amdocs' Ken Roulier.
LRTV Custom TV
Distributed Access Architectures – 2

10|21|14   |   8:51:00 AM   |   (0) comments


ARRIS CTO Network Solutions Tom Cloonan discusses why many if not most MSOs will continue with integrated CCAP, while addressing why some are also looking at two futuristic, distributed access architectures: Remote PHY and Remote CCAP.
LRTV Custom TV
Distributed Access Architectures – 1

10|21|14   |   9:01   |   (0) comments


SCTE Sr. Director of Engineering Dean Stoneback discusses the pros and cons of distributed access architecture (DAA) and its various forms, which range from basic Remote PHY to full CMTS functionality in the node.
LRTV Custom TV
The WiFi Road to Riches – 2

10|21|14   |   3:58   |   (0) comments


ARRIS Senior Solution Architect Eli Baruch talks about how MSOs can enable public and community WiFi through 1) outdoor access points, 2) businesses seeking to offer WiFi to customers, and 3) residential WiFi gateway extensions.
LRTV Custom TV
The WiFi Road to Riches – 1

10|21|14   |   10:15   |   (0) comments


SCTE Director of Advanced Technologies Steve Harris discusses WiFi deployments, drivers, challenges and advances, including 802.11ac, carrier-grade WiFi, community WiFi, Hotspot 2.0, Passpoint, WiFi-First and voice-over-WiFi.
LRTV Custom TV
Advantech Accelerates 100G Traffic Handling

10|17|14   |   7:56   |   (0) comments


Paul Stevens from Advantech explains why handling 100GbE needs a whole new platform design approach and how Advantech is addressing the needs of equipment providers and carriers to give them the flexibility and performance they will need for SDN and NFV deployment.
LRTV Huawei Video Resource Center
Holland's Imtech Traffic & Infra Discusses Huawei's ICT Solution and Services

10|16|14   |   4:49   |   (0) comments


Dimitry Theebe is from the business unit at Imtech Traffic & Infra which delivers communications solutions for transportations. His partnershp with Huawei began about a years ago. In this video, Theebe speaks more about this partnership and what he hopes to accomplish with Huawei.
LRTV Huawei Video Resource Center
Huawei's Comprehensive Storage Solutions Vital for SVR

10|16|14   |   6:16   |   (0) comments


SVR Information Technology provides cloud services for academic and special sectors. With Huawei's support, SVR and Yildiz Technical University has established Turkey's largest and most advanced High Performance Computing system. CSO Ismail Cem Aslan talks about what he hopes Huawei's OceanStor storage system will bring for him.
LRTV Huawei Video Resource Center
Mexico's Servitron's Impression of Huawei at CCW 2014

10|16|14   |   6:35   |   (0) comments


Servitron is a network operator in Mexico that has been in the trunking industry for the past 20 years. Its COO, Ing. Ragnar Trillo O., explains at Critical Communications World 2014 that his company has been interested in the long-term evolution of LTE technology and its adoption for TETRA.
LRTV Huawei Video Resource Center
Building a Better Dubai

10|16|14   |   2:06   |   (0) comments


Abdulla Ahmed Al Falasi is the director of commercial affairs, a telecommunications coordinator for the government of Dubai. Their areas of service span across multiple industries, including police, safety, shopping malls and more. In this video, Abdulla talks about his department's work with Huawei.
LRTV Huawei Video Resource Center
Huawei Lights Up Malaysia Partner Maju Nusa

10|16|14   |   1:59   |   (0) comments


Malaysia's Maju Nusa is an enterprise partner to Huawei in networking, route switches and telco equipment. At this year's Critical Communications World in Singapore, CTO Pushpender Singh talks about what Huawei's eLTE solutions mean to his company and for Malaysia.
LRTV Custom TV
Evolving From HFC to FTTH Networks

10|15|14   |   2:19   |   (0) comments


Cisco's Todd McCrum delves into the future of cable's HFC plant, examining how DOCSIS 3.1 and advanced video compression will extend its life and how the IP video transition will usher in GPON and EPON over FTTH.
Upcoming Live Events
October 29, 2014, New York City
November 6, 2014, Santa Clara
November 11, 2014, Atlanta, GA
December 2, 2014, New York City
December 3, 2014, New York City
December 9-10, 2014, Reykjavik, Iceland
February 10, 2015, Atlanta, GA
June 9-10, 2015, Chicago, IL
Infographics
WhoIsHostingThis.com presents six of the world's most extreme WiFi hotspots, enabling the most epic selfies you can imagine.
Hot Topics
Analysts Warn of Major NFV Gaps
Carol Wilson, Editor-at-large, 10/22/2014
Is Health the Killer App for the IoT?
Jason Meyers, Senior Editor, Gigabit Cities/IoT, 10/22/2014
Drones Hover Over the IoT Sector
Jason Meyers, Senior Editor, Gigabit Cities/IoT, 10/23/2014
1959 Newsreel: Make Phone Calls – From Cars!
Mitch Wagner, West Coast Bureau Chief, Light Reading, 10/24/2014
Meet the Phantom Network for NFV
Ray Le Maistre, Editor-in-chief, 10/23/2014
Like Us on Facebook
Twitter Feed