dpoe in mso network - scte piedmont · pdf filedpoe in mso network ... e1/t1 stm-1 epon olt...

DPoE in MSO Network

SCTE Piedmont Chapter

Presented by Jorge Figueroa

Sr. Systems Engineer

• Introduction to DPoE• DPoE Defined Services• Future Enhancements

© ZTE Corporation. All rights reserved.

> Internal Only

• DOCSIS Provisioning of EPON (DPoE™) is a joint effort

of operators, vendors, and suppliers to support EPON

technology using existing DOCSIS-based back office

systems and processes.

What is DPoE


> Internal Only

FIBER NODE SERVICE AREA

S

P

L

I

T

C

O

M

B

I

N

E

VIDEO FEED

C

O

M

B

I

N

E

FORWARD PATH

OR DOWNSTREAM

REVERSE PATH

OR UPSTREAM

Modem

TV

VIDEO

COAXIAL CABLE

FORWARD

PATH

REVERSE

PATH

5MHz 42MHz 88MHz 860MHz

5MHz 65MHz 108MHz 862MHz

CMTS

NMS

DHCP

TFTPOSS

A Brief Review of the DOCSIS Architecture


> Internal Only

• CM scans for a downstream channel

• CM synchronizes to the downstream channel and locks on the time-base clock

• CM receives upstream parameters (UCD) from downstream messages

• CM receives upstream bandwidth allocation MAP

• CM performs upstream ranging

• CM establishes IP connection (DHCP)

• CM establishes Time of Day

• CM acquires configuration file (TFTP)

• CM registers with the CMTS

• CM is operational

• Optional Baseline Privacy Negotiation

Cable Modem Initialization Process

Summary


> Internal Only

• Both EPON and DOCSIS are Point-to-Multipoint access networks– They both allow two or more network elements to transmit on the same

media using TDMA

– EPON uses fiber exclusively

– DOCSIS uses coax

• However, neither 1G-EPON nor 10G-EPON as specified in IEEE Std 802.3 define any OAMP that allows forwarding of traffic between an ONU Interface (UNI) and the PON.

• One of the primary goals of the DPoE specifications is to provide an interoperable method of reaching the controller for the ONU, identifying the ONU capabilities, and providing that information to the OLT so that it can configure service on an ONU.

• The other is to adapt DOCSIS-based back office provisioning and operations models to EPON. This is the core objective of the DPoEspecifications.

A Comparison of EPON and DOCSIS


> Internal Only

DPoE Architecture

Splitter

HomeSplitter

PC

PHONE

Home

PC

PHONE

PHONE

SFU1

31

0n

m1

31

0n

m

ONU

1490 nm

Splitter

CATV

CATV

Home Gateway/IAD

WIFI/BLUE

TOOTH

FE

POTS

POTSONU

FE

POTS

POTS

POTS

ONU

Home

RF

E1/T1STM-1

EPON OLT (C300)

DOCSIS

Provisioning and

Management

DPoE

System

OLTD

L

D

M

LvCMs

1 Gig EPON Architecture


> Internal Only

Operations Support Systems Comparison

DOCSIS DPoE


> Internal Only

• The DOCSIS Mediation Layer (DML) is the entity or process on the DPoE system that translates all DOCSIS specific management tools into EPON, some of its tasks are:– Interprets the DOCSIS MIBs

– Creates virtual Cable Modems (vCMs) for every ONU and requests IP addresses and configuration files for them.

– Translates the parameters received in the configuration file for each vCM to EPON OAM messages for the ONU.

– Keeping ONU software load up to date using the DOCSIS secure software download mechanism with digitally signed software images

– Provides a CLI that “looks and feels” like a CMTS

The DOCSIS Mediation Layer


> Internal Only

• DPoE ONU ranges and registers with OLT first, as mandated in the 802.3ah and 802.3av specifications

• DPoE system creates vCM for each newly discovered ONU

• vCM obtains IP parameters from the DHCP server, including configuration file name and TFPT server address

• Time of Day does not need to get established since vCMs will synchronize to the DPoE system clock

• vCM obtains configuration file via TFTP

• ONU is then configured through OAM messages

• ONU is now successfully registered and vCM goes into “Operational” state

DPoE ONU Initialization Process


> Internal Only

• The table details which parameters are applicable for an Upstream Service Flow, according to its configured Upstream Scheduling Service Type

– Best Effort (BE) column applies to IP HSD services

– Real Time Polling (RTP) column covers the business MEF services

• Other scheduling types (i.e. UGS) although currently not required in DPoE are also permitted.

DPoE Service Flow Parameters


> Internal Only

• Initial focus of DPoE is on business services.

• The majority of business services can be delivered using Ethernet.

• The foundation for all DPoE services is an Ethernet and 802.1 VLAN-based forwarding model as described by MEF

• Ethernet is the least common denominator of all modern telecommunications services.

• In the access network, Ethernet can be used to deliver:

– Native Ethernet services (as defined by the Metro Ethernet Forum or MEF), or

– IP services transported over Ethernet. IP can, in turn, be used to deliver private IP (IP-VPN) services or public IP (Internet) services.

DPoE Services and MEF


> Internal Only

• UNI: Interface between Public Service Provider Network and Customer Network

• E-NNI: Open Interface between Service Provider Networks [MEF-26]

• I-NNI: Open Interface between two network elements in the same Service Provider Network.

• EVC: The architecture construct that supports the association of UNI reference points for the purpose of delivering an Ethernet flow between subscriber sites across Carrier Ethernet Network.

– EVC carry traffic that belongs to MEF Carrier Ethernet Service instance

– Tagging/Encapsulation is used to isolate traffic that belong to different EVCs

• DPoE MEF Supports IEEE 802.1ad tagging and IEEE 802.1ah Encapsulation

MEF Reference Architecture

Ethernet Services Layer Terminology

Service Provider 1 Carrier Ethernet Network

CECE

UNIUNI

Subscriber

Site

ETHETH

UNI-C

ETHETH

UNI-N

ETHETH

UNI-N

ETHETH

E-NNI

ETHETH

UNI-C

UNIUNI

CECE

I-NNII-NNI E-NNIE-NNI

Service Provider 2

I-NNII-NNI

ETHETH

E-NNI

Subscriber

Site

Ethernet Virtual Connection (EVC)


> Internal Only

• Also known as

– Provider Bridging (PB)

– Stacked VLANs

• 802.1ad allows multiple VLAN headers to be inserted into a single frame

• Inner tag is called C-Tag (Customer tag), Ethertype (TPID) 0x8100 (802.1Q)

• Outer tag is called S-Tag (Service tag), Ethertype (TPID) 0x88a8 (802.1ad)– Other non-standard TPID values can be found in older equipment

• VLAN ID is 12 bits long (0-4095), remaining 4 bits are for QoS

IEEE 802.1ad Tagging


> Internal Only

• Also known as:

– Provider Backbone Bridges (PBB)

– Mac-in-Mac

• Allows interconnection of multiple Provider Bridge Networks without losing each customer's individually defined VLANs

• PBB offers complete separation of customer and provider domains.

IEEE 802.1ah Encapsulation


> Internal Only

• B-Tag is the Backbone VLAN tag

• I-TAG contains:– Ethertype 0x88e7

– A 20 bit I-SID (Backbone Service Identifier)

– Other bits reserved, used for OAM,orQoS

• From a Provider Backbone Bridge perspective, everything after the I-TAG is just payload

PBB Frame Structure


> Internal Only

• MEF services

– PB

• Encapsulation mode

• Transport mode

• TPID translation (Optional)

– PBB

• Encapsulation mode

• Transport mode

• IP (HSD) service

Services Defined by DPoE v1.0


> Internal Only

• In this mode the ONU adds a Service Tag (S-Tag) to

any incoming traffic from the customer (tagged or

untagged):

PB on DPoE - Encapsulation

CPE D-ONU OLTMEF

Network

C-DA

C-SA

C-Tag(O)

Payload

FCS

C-DA

C-SA

C-Tag(O)

Payload

FCS

S-Tag

C-DA

C-SA

C-Tag(O)

Payload

FCS

S-Tag


> Internal Only

• In this mode a DEMARC device before the ONU adds a Service

Tag (S-Tag) to any incoming traffic from the customer (tagged

or untagged).

• Alternatively, customer generates frames with two tags:

PB on DPoE - Transport

DEMARC D-ONU OLTMEF

Network

C-DA

C-SA

C-Tag(O)

Payload

FCS

S-Tag

C-DA

C-SA

C-Tag(O)

Payload

FCS

S-Tag

C-DA

C-SA

C-Tag(O)

Payload

FCS

S-Tag

C-DA

C-SA

C-Tag(O)

Payload

FCS


> Internal Only

• TPID Translation allows the OLT to modify the incoming TPID

provided by the DEMARC or ONU and change it to another

value (i.e. from 0x8100 to 0x88a8)

• Can be used in Transport or Encapsulation Mode

PB on DPoE – TPID Translation

DEMARC D-ONU OLTMEF

Network

C-DA

C-SA

C-Tag(O)

Payload

FCS

S-Tag

(TPID 1)

C-DA

C-SA

C-Tag(O)

Payload

FCS

S-Tag

(TPID 1)

C-DA

C-SA

C-Tag(O)

Payload

FCS

S-Tag

(TPID 2)


> Internal Only

B-DA

B-SA

I-Tag

B-DA

B-SA

I-Tag

• In this mode the ONU adds the Bridge Source MAC,

Bridge Destination MAC, and I-TAG to the beginning

of the frame

PBB on DPoE - Encapsulation

CPE D-ONU OLTMEF

Network

C-DA

C-SA

C-Tag(O)

Payload

FCS

C-DA

C-SA

C-Tag(O)

Payload

FCS

C-DA

C-SA

C-Tag(O)

Payload

FCS


> Internal Only

B-DA

B-SA

I-Tag

B-DA

B-SA

I-Tag

• The DEMARC device adds the Bridge Source MAC, Bridge

Destination MAC, and I-TAG to the beginning of the frame.

• The ONU and OLT simply pass this traffic transparently

PBB on DPoE - Transport

DEMARC D-ONU OLTMEF

Network

C-DA

C-SA

C-Tag(O)

Payload

FCS

C-DA

C-SA

C-Tag(O)

Payload

FCS

B-DA

B-SA

I-Tag

C-DA

C-SA

C-Tag(O)

Payload

FCS


> Internal Only

• An EVC is created between the DEMARC device and the OLT. Tags are

removed by the OLT before entering the router in the DPoE System.

IP HSD Service Through a DEMARC device

DEMARC D-ONU

DPoE System

IP

NetworkOLT Router

EVC

C-DA

C-SA

C-Tag

Payload

FCS

S-Tag

C-DA

C-SA

C-Tag

Payload

FCS

S-Tag

C-DA

C-SA

Payload

FCS

C-DA

C-SA

Payload

FCS


> Internal Only

• The ONU encapsulates incoming untagged traffic using a dynamically assigned C-

Tag/S-Tag pair. OLT then removes tags before entering the router in the DPoE

System

IP HSD Service Through the ONU CMCI Interface

CPE D-ONU

DPoE System

IP

NetworkOLT Router

EVC

C-DA

C-SA

C-Tag

Payload

FCS

S-Tag

C-DA

C-SA

Payload

FCS

C-DA

C-SA

Payload

FCS


> Internal Only

• DEMARC devices are used to provision business services in existing

MSO networks, typically connected to dedicated CWDM link

• There is strong drive to retrofit such devices with DPoE uplink (SFP

ONU) for lower cost transport solution.

• The process of DEMARC service provisioning is currently fully manual

and requires a truck roll every time service changes are needed

(configuration is done manually on the DEMARC device at customer

site)

• There is a strong drive for service configuration automation to allow

operators to change provisioning on demand.

• The DEMARC Auto Configuration mechanism (DAC) process provides

means for the automatic discovery, configuration of an in-band IP

management service, and the discovery and transfer of a configuration

file specific to the particular DEMARC that is discovered and connected

DEMARC Auto Configuration


> Internal Only

1. DPoE ONU registers with DPoE System, EVC is established. This is the DEMARC

Management EVC.

2. D-ONU sends LLDP (802.1AB) messages to DEMARC on UNI port. Parameters sent include:

– Bridge Type (PB, PBB)

– S-Tags and C-Tags if any (PB)

– I-Tags and B-Tag if any (PBB)

3. EVC now extends to DEMARC

4. DEMARC performs DHCP and obtains IP parameters and config file location

5. DEMARC downloads configuration file and configures ports and services

DAC Overview

DEMARC D-ONU

DPoE System

IP

NetworkOLT Router

EVC

LLDP


> Internal Only

Metro

/SONET

/PTN

/MPLS

OC-3/T1

BTS/NodeB

FTTO

T1

Splitter

FTTH

Business

(DPoE/1G-EPON/10G-EPON)

Mobile Backhaul

(DPoE/

1G-EPON/

10G-EPON)

Residential

(DPoE/EPoC)

GEGE/10GE

RNC

GGSN

SGSN

MGW

HLR

MSC Server

IPTV

Softswitch

Service Server

DOCSIS Back-office

TFTP

Splitter1G-EPON/

10G-EPON

ONU

1G-EPON/

10G-EPON

MDU

Splitter

Metro

/SONET

/PTN/MPLS

OLTFTTO

EVC

1G-EPON/10G-EPON

ONT

OLT

with embedded DML

Internet

1G/10G

DHCP

Phone

PCIPTV

1G/10G

1G/10G

TCP/IP

DOCSIS Provisioning

and Management Phone

CMCPCIPTV

CoaxCNUAMP

EPoC

� Back-office sees ONU as CM

� Back-office sees OLT as CMTS

CTBH

DPoE/EPoC Complete Solution


> Internal Only

PB/PBB/IP HSD Service Model

S-ONU

MU-SI

DEMARC

DPoE System

B-ONU

Router

OLT

PBB

D

MN

LCI

CMCI

S-ONU

LCI

CMCI

S-ONU

IP-SG2

S2’

SX

S1+C1

S2

S1+C2

S2

IP Data Service

IP Voice Service

S3+C1

S3+C2

I-SID1

MEF Ethernet Service(PB)

MEF Ethernet Service(PBB)

I-SID2

PB

IP-SG1

S1’


> Internal Only

DPoE 2.0 Service Model

S-ONU

MU-SI

DEMARC

DPoE System

B-ONU

Router

OLT

PBB

D

MN

LCI

CMCI

S-ONU

LCI

CMCI

S-ONU

IP-SG2

S2’

SX

S1+C1

S2

S1+C2

S2

IP Data Service

IP Voice Service

MEF Ethernet Service(PB+EoMPLS)

S3+C1

S3+C2

I-SID1

MEF Ethernet Service(PB)

MEF Ethernet Service(PBB+EoMPLS)MEF Ethernet Service(PBB)

I-SID2

VSIPB

IP-SG1

S1’


> Internal Only

FEATURES

MPLS PE/VPLS

IP-SG Auto-configuration

ASP & MESP

PacketCable Provisioning for Voice Services

Multicast

1588v2 – Precision Time Protocol for Ethernet Mobile Backhaul

IPv6

IPDR

Service OAM

Features for Future DPoE versions (Tentative)


Thanks!

dpoe in mso network - scte piedmont · pdf filedpoe in mso network ... e1/t1 stm-1 epon olt...

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