Fernando Villarruel, Cisco Systems Michael Eggert, Cox Communications Harj Ghuman, Cox Communications Marek Hajduczenia, Charter Communications

For IEEE 802.3 Interim March 5-8 2018

Beyond 10km Optical PHYs Study Group

Backhaul Capacity for Optics in Remote PHY and answers to other questions

Adding detail to messaging so far…

• Remote PHY and Ethernet • DWDM, how many wavelengths • 100G and/or 200G • Non RPHY services • Context for OTN • Context for Cost • Context for timelines

What is Remote PHY ?

“Remote PHY” is a collection of specifications sanctioned by CableLabs that allows DOCSIS to ride over an Ethernet Network

• CableLabs, MHAv2 Series

• CM-SP-R-PHY: Remote PHY System Specification

• CM-SP-R-DEPI: Downstream External PHY Interface Specification

• CM-SP-R-UEPI: Upstream External PHY Interface Specification

• CM-SP-R-DTI: Remote DOCSIS Timing Interface Specification

• CM-SP-R-OSSI: Operation support Systems Interface Specification

• CM-SP-R-GCP: Generic Control Plan Specification

• CM-SP-R-OOB: Out of Band signals Specification

**No new Ethernet requirements.

RPHY Framing

802.1Q VLAN

(optional)

MPLS Header

(optional)

IPv4/6 Header

L2TPv3 Pseudowire

Header

Payload DOCSIS Frames

Ethernet CRC

802.3 Ethernet Header

HUB R-PHY

Node

R-PHY

Node

Aggregation Node Router

Modem

Operation Systems Billing System

DOCSIS Core

VIDEO Core

R-P

HY

Fra

mer

Client to Client

Eth. Backhaul

“RPHY Domain” Ethernet Physical Layer

DOCSIS Analog Eth

PHY Eth PHY

Eth PHY

Eth PHY

Eth PHY

Eth PHY

Remote-PHY defines Pseudowires (L2TPV3) that transmit: -DOCSIS (data traffic) -Broadcast Video -and management within an IP packet and an Ethernet frame. - Transmitted over Ethernet physical layer - Ethernet/IP frames make DOCSIS/Video invisible to the network - no impact to coaxial plant, packet cores, modems & OSS/BSS - DOCSIS data makes up the bulk of the payload volume - Allows a multivendor interoperable environment.

A note on Service Cores

• DOCSIS and Video cores organize and distribute a bandwidth availability per the policy given by Operation and Billing systems. (OSS/BSS)

• DOCSIS data is unique per service group.

• Video can be unique per service group or the same for two or more service groups.

• When video is the same for all service groups we call it broadcast – Fox, CBS, NBC, etc.

Remote PHY Backhaul Physical vs. logical functions

R-PHY Physical Distribution

DOCSIS

VIDEO

HUB R-

PHY

Node

R- PHY

Node

Aggregation Node

• 10 - 80 km • Existing Fiber plant • 100GHz DWDM • 1-16 λs per fiber • Duplex

10GE (existing PHY) < 2 km New Fiber

10-16 PHY Nodes

MUX

DMUX

R-P

HY

Fra

mer

Client to Client

Eth. Backhaul

Eth PHY

Eth PHY

Eth PHY

Eth PHY

Eth PHY

Eth PHY

R-PHY

Node

R-PHY

Node

R-PHY

Node Logical Distribution

DOCSIS

VIDEO

HUB

Router

(Multicast)

SG

SG

SG

SG

R-PHY

Node

R-PHY

Node

R-PHY

Node

R-PHY

Node

R- PHY

Node

R-PHY

Node

R-PHY

Node

R-PHY

Node

R- PHY

Node

R-PHY

Node

R-PHY

Node

R-PHY

Node

R-PHY

Node

• ~200 Subscribers / service group (SG) • Broadcast video

• one video SG for all. • Unicast video considered data carried by DOCSIS.

MUX

DMUX

R-P

HY

Fra

mer

Client to Client

Eth. Backhaul

Eth PHY

Eth PHY

Eth PHY

Eth PHY

Eth PHY

Eth PHY

Eth PHY

Eth PHY

Eth PHY

Eth PHY

Eth PHY

Eth PHY

Eth PHY

Eth PHY

Eth PHY

Eth PHY

Eth PHY

Eth PHY

Eth PHY

Eth PHY

What is the capacity needed for the Remote PHY Ethernet Backhaul?

• Single direction (downstream) capacity, per lambda

• Router in Agg Node servicing:

• 16 R-PHY Nodes

• 4 or 8 R-PHY nodes per DOCSIS service group

• Compounded annual growth rate (CAGR) 40% DOCSIS Data

• Static 1.25 Gpbs Broadcast video

• Broad Market View

• United States (US) SG start at 3 Gbps

• Latin America / Europe (Latam/EU) start at 1 Gbps

• Start in 2019 as most capacity has already been planned for then.

Client to Client R-PHY Backhaul Capacity

0

50

100

150

200

250

300

2018 2020 2022 2024 2026 2028 2030

Bac

khau

l Cap

acit

y (G

pgs

)

Timeline (Yrs)

US 4 PRD per SG

LATAM / EU 4 RPD per SG

US 8 RPD per SG

LATAM / EU 8 RPD per SG

0

50

100

150

200

250

300

2018 2020 2022 2024 2026 2028 2030

Bac

khau

l Cap

acit

y (G

pgs

)

Timeline (Yrs)

US 4 PRD per SG

LATAM / EU 4 RPD per SG

US 8 RPD per SG

LATAM / EU 8 RPD per SG

Backhaul Optics Planning

(1-5) 10G ZR

(1-3) 100 G

(1) 200 G

• 100G DWDM Ethernet PHY needed to make this transition

• Leverage mature technology

0

50

100

150

200

250

300

2018 2020 2022 2024 2026 2028 2030

Bac

khau

l Cap

acit

y (G

pgs

)

Timeline (Yrs)

US 4 PRD per SG

LATAM / EU 4 RPD per SG

US 8 RPD per SG

LATAM / EU 8 RPD per SG

Backhaul Optics Adoption Timelines

(1-5) 10G ZR

(1-2) 100 G Eth. PHY

(1) 200 G Eth PHY

• Adoption time frame is dependent on cost delta between 1-5 10G DWDM ZR and 100G DWDM optics

• Early deployments with DWDM 10G ZR, quickly exhaust fiber capacity.

100G client (Ethernet) specification is needed today to enable RPHY is full scale deployments. - Routers must be installed day one with capability to grow to 100G backhaul. Can use a handful of 10G ports to start, but not for long. - note, 200G is also useful, but 100G is the high volume runner with expected robust cost reductions.

What about other services’ impact on backhaul ?

• Unicast. • Terminate at multiple

packet cores. • 12-18, 10G downlinks • 200G useful • Don’t have to use a router

could use an (OTN) Muxponder at aggregation node

• A minority of links compared to R-PHY.

See: http://www.ieee802.org/3/B10K/public/18_01/knittle_b10k_01_0118.pdf

Cores Router (100G)

100G

...…

.....

……

……

……

…

.……

……

...

100/200

GE

DWDM

Aggregation Router (10G)

…

…

…..

10G

RPD

RPD

RPD

RPD

RPD

RPD

RPD

RPD

HDC NODES 8-18 RPD’s

HFC NODES 8-18 RPD’s

HFC NODES 8-18 RPD’s

Other Services

8-18 RPD’s

10G 10G 10G

…..…

……

……

..

..…

..…

..…

..…

..…

..…

PACKET CORES

…

…

10 GE DWDM

10G

..…

100G

MuxP (20x10)

MuxP

100 / 200G OTN

DWDM

100G

10 GE DWDM

Field Router

Field Router

HU

B / HEAD

END

O

UTSID

E PLANT

• Available today

• In definition and CableLabs and proposed at this study group

• Proprietary link solutions

Added detail to messaging so far…

• Remote PHY and Ethernet • DWDM, how many wavelengths • 100G, 200G • Other services • Context for OTN • Context for Cost • Context for timelines

Fernando Villarruel, Cisco Systems Michael Eggert, Cox Communications Harj Ghuman, Cox Communications Marek Hajduczenia, Charter Communications

For IEEE Ad-Hoc February 20, 2018

Backhaul Optics for Remote PHY Answers to questions so far