mtera sonet/sdh migration benefits of infinera mtera · 2019-06-12 · 3 mtera sonet/sdh migration...

mTera SONET/SDH Migration Evolving TDM Networks to OTN/Packet with the Infinera mTera UTP

Although spending on SONET/SDH infrastructure has declined over the past decade, the technology persists in many networks and reliably performs valuable network functions while delivering high margin revenues. However, network operators with SONET/SDH infrastructure must contend with high operational costs related to maintenance, power consumption, and footprint in addition to the increasing challenges of obtaining replacement parts. The Infinera mTera Universal Transport Platform (UTP), together with the entire Infinera packet optical portfolio, provides a range of options for lowering operational costs without losing the high margin revenues generated by legacy SONET/SDH.

ANALYZING THE DRIVERS FOR SONET/SDH MIGRATIONFollowing standardization in the late 1980s, SONET/SDH achieved widespread adoption in the 1990s and became the dominant transport technology for network operators around the globe. Aided by the evolution to more packet-friendly next-generation SONET/SDH, network operators continued to invest billions in their SONET/SDH infrastructure in the 2000s. And despite continued attempts to displace SONET/SDH over the last fifteen years, the technology remains in the networks of many network operators as it reliably performs functions such as mobile network synchronization and delivers highly profitable services to risk-averse end customers.

However, network operators with traditional SONET/SDH networks face a number of challenges, as shown in Figure 1. In addition to costly maintenance contracts, obtaining replacement parts can be a challenge as equipment manufacturers discontinue platforms and/or specific modules due to component obsolescence. Legacy SONET/SDH equipment also typically requires a larger footprint and higher power consumption relative to next-generation packet optical platforms. Together, these challenges result in high operational costs. Furthermore, the majority of SONET/SDH equipment supports a maximum interface speed of 10 Gbps (OC-192/STM-64), which limits the ability to scale bandwidth cost effectively.

BENEFITS OF INFINERA MTERA SONET/SDH MIGRATION:

■ Scale STS-1/VC-4 switching to 1.68 Tbps and 100G+ interfaces

■ Protect high margin SONET/SDH service revenues with Infinera mTera STS-1/VC-4 and OTN switching, the Infinera 7090 CEM for TDM Circuit Emulation, and the Infinera 7100 Pico for OTN ADM

■ Deliver end-to-end services with SONET/SDH to OTN and SONET/SDH to packet interworking

■ Avoid high maintenance costs by replacing legacy SONET/SDH equipment with future-proof next-generation platforms

■ Reduce power consumption with less than 3 W per Gbps for STS-1/VC-4 switching, less than 0.7 W per Gbps for OTN switching, and less than 0.9 W for packet switching

■ Minimize the number of 100G+ line interfaces with efficient STS-1/VC-4 grooming for SONET/SDH

A P P L I C A T I O N N O T E

2 mTera SONET/SDH Migration

ADM

ADMADM

ADM

ADM

ADM

ADM

ADM

ADM

ADM

SONET/SDH Ring

SONET/SDH Ring

ADM

ADMADM

ADM

ADM

SONET/SDH Ring

OC-192/STM-64

OC-192/STM-64

OC-192/STM-64

STS-

1/V

C-4

STS-

1/V

C-4

STS-

1/V

C-4

STS-

1/V

C-4

SONET/SDHSwitch (DXC)



Limited scalability

No 100G interfaces

High power consumption

Large footprint

High maintenance costs

Challenges replacing failed parts

Manufacturers discontinuing platforms and/or specific modules

Limitations ofTraditional SONET/SDH:

CONVERGING OTN, PACKET, AND SONET/SDH ON A SINGLE PLATFORMThe mTera UTP provides a number of options for migrating SONET/SDH networks and services to next-generation platforms and technologies. It provides a future-proof architecture that offers universal switching of packet, OTN, and/or SONET/SDH. The mTera UTP can be deployed as a standalone OTN switch, a standalone packet switch, or a standalone SONET/SDH switch. Hybrid operation enables OTN switching, different flavors of packet switching, and/or SONET/SDH switching to function simultaneously in the same shelf and even on the same cards and ports, thus saving CapEx and footprint. Hybrid operation also enables different switching types to share the same high speed line interfaces, thereby reducing interface costs and decreasing the number of wavelengths on the optical network.

Figure 2: Infinera mTera UTP High Level Overview

Figure 1: Traditional SONET/SDH Network

OTN MPLS-TP CarrierEthernet

SONET/SDH

10G DWDM 100G DWDM 100G/150G/200G

ROADM-on-a-Blade (Optional)

Universal Switching


The DWDM layer can be provided by the Infinera 7100 Packet Optical Transport Solutions, Infinera hiT 7300 Multi-Haul Transport Platform, or third-party DWDM equipment. Alternatively, with its optional ROADM-on-a-blade modules, the mTera UTP can provide a converged packet optical system with both electrical switching and DWDM.

REPLACING LEGACY SONET/SDH CORE SWITCHES WITH THE 1.68 TBPS MTERA UTPOne simple migration option, as shown in Figure 3, is to keep the SONET/SDH ADM rings and replace the core switches/DCSs with the mTera UTP as a high-capacity STS-1/VC-4 switch. With the SSM-2S modules, the mTera 14-slot shelf can provide up to 1.68 Tbps of STS-1/VC-4 switching in 19RU, and the mTera 8-slot shelf can provide up to 960 Gbps in 10RU (23-inch rack) or 12RU (ETSI or 19-inch rack).

Additional benefits include reduced power consumption and footprint with STS-1/VC-4 switching at less than 3 W per Gbps and up to 96 Gbps per rack unit, as shown in Table 1.

Figure 3: Replace Core SONET/SDH Switches with the mTera UTP

ADM

ADMADM

ADM

ADM

ADM

ADM

ADM

ADM

ADM

SONET/SDH Ring

SONET/SDH Ring

ADM

ADMADM

ADM

ADM

SONET/SDH Ring

OC-192/STM-64

OC-192/STM-64

OC-192/STM-64

Infinera mTeraInfinera mTera

STS-

1/V

C-4

STS-

1/V

C-4

Infinera mTera

STS-

1/V

C-4

STS-

1/V

C-4

Up to 1.68 TbpsSTS-1/VC-4 switching

Reduced power consumption

Reduced footprint

Future-proof platform

mTera UTP Benefits:

Table 1: Legacy SONET/SDH vs. mTera UTP

Maximum Switch Capacity

Maximum Line Interface

Footprint (Gbps per RU)

Power (W per Gbps)

320 Gbps ~ 640 Gbps

15 to 20

10 Gbps

5 to 10

Legacy SONET/SDH

1.68 Tbps 12 Tbps

Up to 96 Up to 400

200 Gbps 200 Gbps

< 3 < 0..7 (OTN), <0.9 (Packet)

STS-1/VC-4 Switching Packet/OTN Switching

Infinera mTera UTP


ADM

ADMADM

ADM

ADM

ADM

ADM

ADM

ADM

ADM

SONET/SDH Ring

SONET/SDH Ring

ADM

ADMADM

ADM

ADM

SONET/SDH Ring100G+

100G+

100G+Infinera mTeraInfinera mTera

STS-

1/V

C-4

OTN

Infinera mTera

100G+ line interfaces

Mix SONET/SDH, OTN, and packettra�c on the same 100G+ interfaces

Up to 1.68 Tbps STS-1/VC-4 switching

Reduced power consumption

Reduced footprint

Future-proof platform

mTera UTP Benefits:

STS-

1/V

C-4

OTN

STS-

1/V

C-4

OTN

STS-

1/V

C-4

OTN

LEVERAGING SONET/SDH TO OTN INTERWORKING FOR 100G+ LINE INTERFACESAs shown in Figure 4, leveraging mTera UTP SONET/SDH to OTN interworking, the STS-1/VC-4 traffic can be mapped to OTN and transported over high speed 100G and flexi-rate (100G/150G/200G) line interfaces. Optionally, these interfaces can be shared with other OTN switched and packet switched traffic to maximize their utilization.

SCALING ETHERNET OVER SONET/SDH WITH A PACKET SWITCHED COREAnother option is to leverage mTera UTP SONET/SDH to packet interworking, taking Ethernet over SONET/SDH traffic from the ADM rings, terminating the SONET/SDH, and then mapping the Ethernet traffic into a packet switching instance on the mTera UTP. In this way, the full packet feature set of the mTera can be extended to Ethernet interfaces on the ADMs, and end-to-end Ethernet services can be delivered over multiple transport switching domains. This application can be supported in parallel to the previously described applications with packet, SONET/SDH, and OTN switching able to share the same physical mTera hardware and interfaces.

Figure 4: Transport SONET/SDH over 100G+ Line Interfaces

Figure 5: Ethernet over SONET/SDH to Packet Interworking

ADMADM

ADM

ADM

ADM

ADM

ADM

ADM

ADM

SONET/SDH Ring

SONET/SDH Ring

ADM

ADMADM

ADM

ADM

SONET/SDH Ring100G+

100G+

100G+Infinera mTeraInfinera mTera

STS-

1/V

C-4

PAC

KET

Infinera mTera

Extend mTera packet switching to Ethernet interfaces on SONET/SDH ADMs

End-to-end MEF Ethernet services over multiple transport domains

Scalable packet core with 100G+ interfaces

Statistical gains and granularity ofpacket switching

mTera UTP Benefits:

STS-

1/V

C-4

STS-

1/V

C-4

PAC

KET

STS-

1/V

C-4

PAC

KET

ADM

Ethernet over SONET/SDH

PAC

KET


ADM

ADMADM

ADM

ADM

mTera Ring

mTera Ring

mTera Ring100G+

100G+

100G+ 14-Slot mTera14-Slot mTera

STS-

1/V

C-4 OTN

Pack

et

14-Slot mTera

TDM CES: T1/E1 DS3 OC-3/STM-1 OC12/STM-4 OC-48/STM-16

Synchronization: Synchronous Ethernet 1588v2

Infinera 7090 CEM Benefits:

STS-

1/V

C-4 OTN

Pack

et

STS-

1/V

C-4 OTN

Pack

et

OTN

mTera 8

T1/E1/CES

T1/E1/CES

T1/E1/CES

T1/E1/CES

Pack

et

STS-

1/V

C-4

Platforms: 8 Gbps to 960 Gbps

ADM

ADMADM

ADM

ADM

SONET/SDH Ring

Partial Mesh

ADM

ADM

ADM

mTera Ring100G+

100G+ 14-Slot mTera14-Slot mTeraST

S-1/

VC

-4 OTN

Pack

et

14-Slot mTera

Option of compact 8-slot mTera

Migrate from ring to mesh orpartial mesh topologies

Scale rings to 100G+

Mix SONET/SDH, packet, OTN, and DWDM on the same platform

Introduce incrementally or replace entire rings

mTera UTP Benefits:

100G+

STS-

1/V

C-4 OTN

Pack

et

STS-

1/V

C-4 OTN

Pack

et

STS-

1/V

C-4 OTN

Pack

et

8-Slot mTera

MIGRATING SONET/SDH RINGS TO UNIVERSAL TRANSPORT WITH THE MTERA UTPIn addition to deploying the high-capacity 14-slot mTera as a replacement for core SONET/SDH switches and DCSs, network operators have the option to extend the benefits of universal transport to the SONET/SDH rings by replacing either entire rings or individual nodes with either the higher capacity 14-slot mTera or the more compact 8-slot mTera. The 8-slot mTera provides 960 Gbps of STS-1/VC-4 switching and up to 4 Tbps of OTN/packet switching and can be mounted horizontally consuming 10RU in a 23-inch rack or vertically consuming 12RU in a 19-inch or ETSI rack. In addition, the mTera SONET/SDH protection and restoration schemes can be combined with OTN protection and restoration to provide end-to-end resiliency from the SONET/SDH rings over the OTN core.

COMPLEMENTING THE MTERA WITH THE INFINERA 7090 CEM FOR T1/E1 CESThe mTera UTP supports STM-1/OC-3, STM-4/OC-12, STM-16/OC-48, and STM-64/OC-192 SONET/SDH interfaces. Where there is a need to support lower speed TDM interfaces such as T1/E1, the Infinera 7090 Packet Transport Solutions CEM platforms can complement mTera UTP rings with the ability to provide TDM Circuit Emulation Services (CES) over MPLS-TP with support for T1/E1, DS3, OC-3/STM-1, OC-12/STM-4, and OC-48/STM-16 interfaces, as shown in Figure 7.

Figure 6: Migrate SONET/SDH Rings with the mTera UTP

Figure 7: E1/T1 CES with the Infinera 7090 CEM


REPLACING SONET/SDH RINGS WITH OTN ADMs AND STS-1/VC-4 SWITCHING IN THE COREOTN ADMs provide another option for migrating SONET/SDH rings. The 2RU Infinera 7100 Pico Packet Optical Transport Platform can provide a compact 100G ADM with a pair of HGTM-MS2 100G muxponder/ADM modules. Alternatively, a 10G ADM option is available with the OMM-X module, which provides two 10G/OTU2 line interfaces and eight low speed SFP client ports. SONET/SDH traffic can be mapped to ODU0s, ODU1s, or ODU2s and then transported over the 10G or 100G OTN ring to the mTera UTP.

At the mTera UTP, this traffic can either be switched natively as with OTN or it can be sent to an SSM-2S module for STS-1/VC-4 grooming before being mapped back to OTN. This STS-1/VC-4 grooming can result in much more efficient utilization of high speed line interfaces, for example enabling an OTU4 to carry 640 STM-1s/OC-3s, rather than 80 OC-3s/STM-1s when OC-3s/STM-1s are carried in ODU0s, as shown in Figure 9.

Figure 8: OTN to the Edge with STS-1/VC-4 Grooming in the Core

Figure 9: Native OTN Switching vs. OTN Switching with STS-1/VC-4 Grooming

Cost-e�ective OTN ADMs

Low power and small footprint

Increased ring capacity (100G)

Reduced maintenance costs

Future-proof platforms

STS-1/VC-4 grooming at core maximizes the utilization of 100G+ line interfaces

mTera + Pico OTN ADM:ADM

10G OTN Ring

10G OTN Ring

100G OTN Ring100G+

100G+

100G+ Infinera mTeraInfinera mTera

OTN

OTN

STS-

1/V

C-4

Infinera mTera

OTN

OTN

STS-

1/V

C-4

OTN

OTN

STS-

1/V

C-4

OTN

OTN

STS-

1/V

C-4

OC-3/STM-1

OC-3/STM-1

Native OTN Switching

ODU4

ODU0 ODU0 ODU0 ODU0 ODU0 ODU0 ODU0 ODU0 ODU0 ODU0








80xOC-3/STM-1 = 12.5% Utilization

OTN Switching with STS-1/VC-4 Grooming

ODU4ODU2 ODU2 ODU2 ODU2 ODU2 ODU2 ODU2 ODU2 ODU2 ODU2

640xOC-3/STM-1 = 100% Utilization


10G Packet Ring

ADM

ADM

10G Packet Ring

100G Packet Ring100G+

100G+

100G+ Infinera mTeraInfinera mTera

Infinera mTera

10GE and 100GE rings

TDM CES: T1/E1, DS3, OC-3/STM-1, OC-12/STM-4, OC-48/STM-16

Ethernet Clients: FE/FX, GE, 10GE, 100GE

MPLS-TP with hard QoS

Statistical gain and granularityof packet

Low power and small footprint

Reduced maintenance costs

Future-proof Platforms: 8 Gbps to 960 Gbps

Infinera 7090 CEM Rings:

OTN

STS-

1/V

C-4

Pack

et OTN

STS-

1/V

C-4

TDM CES

TDM CES

Ethernet TDM CES

TDM CES

Pack

et OTN

STS-

1/V

C-4

OTN

STS-

1/V

C-4Pa

cket

Pack

et

ADM

Infinera7090CEM

REPLACING SONET/SDH RINGS WITH PACKET/TDM CES RINGSAn additional option for the SONET/SDH rings is to migrate them to packet switching based on MPLS-TP, including VPLS/H-VPLS, with TDM CES for the TDM interfaces, leveraging the 7090 CEM Series. Benefiting from the granularity and statistical gains of packet, these rings can be used to deliver both Ethernet and TDM services through the mTera UTP as it provides a scalable core packet switch with the additional ability to perform SONET/SDH and OTN switching.

DELIVERING END-TO-END SERVICES WITH SONET/SDH-PACKET AND SONET/SDH-OTN INTERWORKINGLeveraging its universal switching and interworking capabilities, the mTera UTP can provide a gateway between the SONET/SDH domain and other transport domains based on OTN, MPLS-TP, and Carrier Ethernet technologies. The mTera UTP can enable end-to-end TDM and Ethernet services that span the SONET/SDH domain and the OTN domain. Universal switching can also enable end-to-end Ethernet services that span the SONET/SDH domain and packet domains including MPLS-TP/H-VPLS, Carrier Ethernet VLAN cross-connect, and Carrier Ethernet bridging.

Figure 10: Packet/CES Rings with the Infinera 7090 CEM

Figure 11: End-to-end Services Gateway

OTN Switcheddomain

MPLS-TPdomain

VLAN XCdomain

Bridgingdomain

mTera UTP

OTN

STS-1/VC

-4

Pack

et

SONET/SDHdomain


24xSFP (OC-3/STM-1, OC-12/STM-4, OC-48/STM-16) 6x10G SFP+ (OC-192/STM-64)

SSM

-2S

120G

STS

-1/V

C-4

OTNInterworking

(60 Gbps)

PacketInterworking

(30 Gbps)

BACKPLANE UNIVERSAL FABRICS

NativeSTS-1/VC-4

OTN

Packet

FEATURING THE MTERA SSM-2S SONET/SDH SWITCHING MODULEThe mTera SSM-2S module provides six 10G SFP+ ports for OC-192/STM-64 and twenty-four SFP ports for OC-3/OC-12/OC-48/STM-1/STM-4/STM-16. 120 Gbps of native STS-1/VC-4 traffic per SSM-2S module can be switched between ports on the same SSM-2S module and between ports on different SSM-2S modules via the backplane and mTera universal fabrics. The SSM-2S therefore is designed to enable up to 1.68 Tbps of STS-1/VC-4 switching in the 14-slot mTera and 960 Gbps in the 8-slot mTera.

The SSM-2S module is designed to also support:

■ SONET/SDH to OTN interworking: 60 Gbps of STS-1/VC-4 traffic from the same module or other SSM-2S modules mapped to OTN and switched to the mTera OSM OTN/packet modules

■ SONET/SDH to packet interworking: Terminate up to 30 Gbps of Ethernet over SONET/SDH traffic from the SONET/SDH ports and switch the Ethernet traffic into the packet switching on the mTera OSM OTN/packet modules

■ Synchronization: Stratum 3 clocks in the mTera timing and processor modules with timing references coming from either the interfaces on the switching modules or external timing interfaces (T1/E1/2MHz) in the shelf common equipment

■ SONET/SDH protection: UPSR, SNC, 1+1 APS, and 1+1 MSP

■ ASON/GMPLS protection and restoration: STS-1/VC-4

SONET/SDH resiliency schemes can also be combined with the mTera packet and OTN resiliency schemes including ODUk-level ASON/GMPLS protection and restoration.

MIGRATING WITH INFINERA PROFESSIONAL SERVICESInfinera offers comprehensive professional services to assist with the migration of SONET/SDH networks. These professional services follow a four-phase process, as shown in Figure 13. The first phase provides a network audit that includes: identifying the targeted network elements, conducting a field audit, and gathering each network element configuration and the physical and logical circuit assignments. This process enables Infinera Professional Services to determine the high level project scope.

Figure 12: mTera SSM-2S SONET/SDH Switching Module

The second phase in the migration of SONET/SDH networks includes network analysis, a migration plan and procedures, and equipment selection and deployment. The third phase consists of provisioning the new network elements, installing new facility wiring/optics, and testing the end-to-end circuits. The fourth and final phase includes executing the facility/service migrations, verifying the alarms, and updating the new circuit designs in the OSS and other support systems.

SUMMARYThough SONET/SDH networks continue to deliver high margin services to risk-averse customers and perform useful network functions such as mobile network synchronization, they suffer from high operational costs and the threat of component obsolescence. The mTera UTP, together with the 7090 CEM and 7100 Pico, provides a range of options for migrating SONET/SDH networks to next-generation OTN/packet technologies and future-proof platforms while lowering operational costs and protecting SONET/SDH service revenues. These Infinera solutions can also deliver a wide range of additional services based on their OTN switching, packet switching, and DWDM/ROADM capabilities.

Proj

ect/

Prog

ram

Man

agem

ent

Phase I: Network Audit & Records Reconciliation

Phase II: Network Analysis, Migration Design & Equipment Build-out Specifications

Phase III: Network Build-out & Network Circuit Test

Phase IV: Network Migration Execution

Figure 13: Infinera Professional Services Process for SONET/SDH Migration

© 2019 Infinera Corporation. All Rights Reserved. Infinera and logos that contain Infinera are trademarks or registered trademarks of Infinera Corporation in the United States and other countries. All other trademarks are the property of their respective owners. Statements herein may contain projections regarding future products, features, or technology and resulting commercial or technical benefits, which are subject to risk and may or may not occur. This publication is subject to change without notice and does not constitute legal obligation to deliver any material, code, or functionality and is not intended to modify or supplement any product specifications or warranties. 0012-AN-RevA-0519

mtera sonet/sdh migration benefits of infinera mtera · 2019-06-12 · 3 mtera sonet/sdh migration...

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