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Carrier Ethernet-Based Converged Services Infrastructure using Ethernet over PDH

Enables new capabilities over ubiquitous T1/E1 Access Networks

October 15, 2007

Ralph SantitoroDirector of Carrier Ethernet Solutions

[email protected]


Market Opportunity for Ethernet over Market Opportunity for Ethernet over Copper PDH Access NetworksCopper PDH Access Networks

Over 86% of businesses do not have access to FiberThese businesses typically have 1 to 2 DS1s used for:

Internet Access, VoIP and IP VPNBandwidth is growing but sub-10Mbps appears to be the “sweet spot”

These business locations often part of a multi-site enterprise

Source: Vertical Systems Group


What is Ethernet over PDH (EoPDH)?What is Ethernet over PDH (EoPDH)?

PDH (Plesiochronous Digital Hierarchy)Term to collectively refer to DS1/DS3 and E1/E3 circuitsThe ‘copper’ electrical circuits in the digital hierarchy

Leverages benefits of Ethernet to deliver converged services over PDH access network (DIY or Managed Service)

Site-to-site and multi-site ‘hub and spoke’ Layer 2 VPNsFrame Relay migration and replacement

Ethernet Access to IP services Internet Access, IP VPNs, IP Telephony (VoIP)

Service Bandwidth Options (technology dependent)Up to 12Mbps (8 bonded DS1s) or 24Mbps (16 bonded DS1s)Up to 16Mbps (8 bonded E1s) or 32Mbps (16 bonded E1s)Up to 32Mbps (1 E3)Up to 45Mbps (1 DS3)

Ethernet over PDH (EoPDH) also referred to as Ethernet over PDH (EoPDH) also referred to as Ethernet over TDM (EoTDM) or Ethernet over SerialEthernet over TDM (EoTDM) or Ethernet over Serial


Two technologies used to deliver EoPDHTwo technologies used to deliver EoPDH

PPP/MLPPP/BCP-based EoPDH (RFC1990 / RFC3518)for encapsulation, bonding and bridging

GFP/VCAT/LCAS-based EoPDH (ITU-T G.8040) GFP (G.7040) for encapsulation,

VCAT (G.7041) and LCAS (G.7042) for bonding

Device supportEoPDH Aggregation Devices

MLPPP/BCP-based EoPDH aggregation supported by:

PDH interface and protocol processor add-in cards for routers

New EoPDH edge aggregation devices

GFP-based EoPDH aggregation supported by:

EoPDH add-in cards for Multiservice Provisioning Platforms (MSPPs)

CPE DevicesMLPPP/BCP-based EoPDH supported on most CPE WAN routers and IADs

GFP-based EoPDH supported on new types of CPE devices


How is EoPDH Deployed ?How is EoPDH Deployed ?

Ethernet Frames enter EoPDH CLE device and encapsulatedInto PPP/MLPPP for transport over PDH network

LEC multiplexes DS1s into channelized DS3 circuits or Microwave Backhaul provider transports DS1 circuit dataDS1s or channelized DS3 circuits terminated on EoPDH Aggregator

DS1s extracted from chDS3s, MLPPP terminated and Ethernet Frames reconstructed

EoPDH preserves original Ethernet 802.1Q tagged frame, adds IEEE 802.1ad S-VLAN tag (QinQ) and passes to Ethernet Transport or IP/MPLS Network

LECLECEoPDH

CLEEoPDH

Aggregator

Untagged or C-VLAN-taggedEthernet Frame

ETH

IP

IEEE 802.1ad S-VLAN Tagged Ethernet Frame

ETH

IP

MicrowaveBackhaul Provider

Enterprise Enterprise or Cell Site or Cell Site

RANRAN

Ethernet Ethernet Transport Transport NetworkNetwork

Channelized DS3s

IPETHPPP

T1, Bonded

T1s or T3

IPETHPPP


Why Ethernet over PDH ?Why Ethernet over PDH ?

Enables new Ethernet-based servicesOver existing Copper PDH Access Network Facilities

with no speed or distance limitations

T1s are the most widely deployed access network technology for businesses data networking in North America

Fits within Provider’s existing network/business operationsIn many cases, can use existing CLE devicesFits within existing T1 Internet access service infrastructure & NOC

Simplifies Access/Aggregation NetworksTerminates TDM PDH circuits as close to subscriber as possible

Subscriber IP traffic is “backhauled” over Ethernet transport networkLayer 2 VPN switching performed locally as needed

Deploy fewer, larger routers at the IP service edgeLower cost (CapEx) Ethernet switching and transport used

at Central Offices or Co-location Facilities

Resulting in a Simplified Network ArchitectureResulting in a Simplified Network Architecture


Which EoPDH approach and why?Which EoPDH approach and why?

MLPPP/BCP-based EoPDH SolutionUsed for Retail Service Delivery of Ethernet and IP services

Service providers have widely deployed base of CLE WAN routers and IADs that use MLPPP that can support BCP

They just enable BCP via configuration change on the device

Used for Wholesale Service DeliveryBackhaul of CDMA IP RAN equipment over DS1s/E1s

WCDMA / UMTS R5 & R6 and CDMA 1xEVDO use MLPPP

GFP/VCAT/LCAS-based EoPDH SolutionUsed for Wholesale Service Delivery

Backhaul of IP-based RAN equipment with Ethernet output

Bonds up to 16 DS1s/E1s addressing higher BW requirements

Enables a common protocol suite to be used across an Ethernet over SONET/SDH transport network

Both approaches provide different benefits and Both approaches provide different benefits and depend upon the application to be supporteddepend upon the application to be supported


Ethernet over PDH Solution SummaryEthernet over PDH Solution Summary- North American Example- North American Example

EoPDH for Aggregation of Retail Ethernet and IP Service Delivery

DS1s

LECRouter, IAD or EoPDH CPE

IP Service Networks

EoPDH Aggregation

chDS3sEnterprise

DS1s or DS3

Central Office or Co-location facility

Internet, VoIP,

IP VPNEthernet

Transport NetworkDS1

EoPDH for Aggregation and Backhaul of Mobile IP RANs

DS1s

LECEoPDH CPE

EoPDH Aggregation

chDS3sDS1s or

DS3

Wireless Hub Site

Mobile Switching

CenterEthernet

Transport NetworkCDMA IP

RANs with PDH output Microwave

Backhaul of

PDH Circuits

DS1s

IP RAN with Ethernet output

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