Phy Layer Monitoring - IEEEgrouper.ieee.org/groups/802/3/ba/public/mar08/jiang_01_0308.pdf ·...

HUAWEI TECHNOLOGIES Co., Ltd.IEEE 802.3ba Task Force, 2008

PHY Layer Monitoring

Chiwu Ding, Zeng Li, and WB Jiang

HUAWEI TECHNOLOGIES Co., Ltd.

Page 3

IEEE 802.3ba Task Force, 2008

Outline

• PHY monitoring in 10GE• 100GE PHY Monitoring

–Improvement to multi-lane architecture

• Detailed discussion on 100GE PHY Monitoring–PHY OAM block definition

–Transmission mechanism of PHY OAM


Page 4


PHY Monitoring in 802.3ae• There is a Link Fault Signaling mechanism in 10GE

– Reside in Reconciliation Sublayer (RS)– To monitor link status between local RS & remote RS and perform link status

notification– Sublayers within the PHY are required to detect faults that render a link unreliable

High Layer

MACRS

PCSWIS (Optional)

PMAPMD

High Layer

MACRS

PCSWIS (Optional)

PMAPMD

XGMII

MDI

PHY

LF RF

RF RF

RF

RF

RF

LF: Local FaultFaults detected between the remote RS and the local RS

RF: Remote FaultRF signal originated at RS when detects LF


Page 5


PHY Monitoring in 802.3ae• Link fault status covers all possible defects detected between

local RS and remote RS– I/O Signal Detect– Protocol Detect, includes:

• CODEC Synchronization• Lane Alignment (Multi-Lane Only, 10GBASE-X)• WIS Frame/Payload Acquisition• Link Status Report Recognized

• RS reports the fault status of the link– Local Fault indicates a fault detected on the receive data path– Remote Fault indicates a fault on the transmit path

• RS response to the link fault status– LF: Stop sending MAC data, and continuously generate a RF status on the

transmit path when LF status reaches the RS– RF: Stop sending MAC data, and continuously generate Idle on the transmit path

when RF status received by the RS


Page 6


100GE PHY Monitoring Suggestion

• Inherit Link Fault Signaling mechanism from 10GE• Improve 100GE multi-lane architecture to provide enhanced

PHY OAM function–Monitor each lane separately–Distinguish between lane status and link status

• LLF: Local Lane Fault• RLF: Remote Lane Fault

– Indicate more detailed link or lane status information for management• Signal fault/defect, Protocol fault/defect, Synchronization error, etc.?• Fault location indicate

–Mapping between 100GE PHY OAM and transport network OAM–Some more functions to be considered

• BER monitor• Auto negotiate via PHY OAM


Page 7


100GE PHY Monitoring Suggestion

• New PCS architecture will be introduced in 100GE, and multi-lane PHY monitoring should be supported to per lane or per lambda–Independent laser monitoring (fault, performance, laser degradation)

–Improve Ethernet PHY reliability

OTN Line-card

Router Line-card

OTN Line-card

Router Line-card

OTN Line-card

Router Line-card

OTN Line-card

Router Line-card

4x25G xWDM

(4-Lane PMD)10x10G Multi-lane fiber

(10-Lane PMD)

λ

λ


Page 8


PHY OAM Process

• PHY OAM is defined as a new block type.• Two options may be considered to transmit PHY OAM on

lane–Insert PHY OAM by stealing from IPG without extra bandwidth

–Increase line rate to carry the PHY OAM

• Receive and notify the PHY OAM information–Detect PHY OAM information at receive path

–Indicate PHY OAM information to upper layer


Page 9


What Should the OAM Block Look like?•OAM block: 64-bit data + 4-bit ctrl

NullNewNNNNNNNN

Alignment1101AAAAAAAA

OAM1011OOOOOOOO

ReserveNewXXXXXXXX

Control1111CCCCCCCCTerminate0001TDDDDDDDTerminate0010CTDDDDDDTerminate0011CCTDDDDDTerminate0100CCCTDDDDTerminate0101CCCCTDDDTerminate0110CCCCCTDDTerminate0111CCCCCCTDTerminate1000CCCCCCCT

Start1010DDDSCCCCStart1001DDDDDDDSData0000DDDDDDDD

DescriptionTXC/RXCTXD/RXD

1011

Block type:8bits

OAM type: 8bits•x01H:LLF•x02H:RLF•x03H:status advertisement•x04H:BER Monitor•Others: reserved

Broadcast OAM / lane OAM : 2bits

lane ID : 6bits

OAM value : 24bits

reserved

0xa5


Page 10


Insert OAM Block by Stealing from IPG

Block Generator

Block Distributor 64B/66B

encoder64B/66Bencoder

64B/66Bencoder

66bitLane1

Lane2

Lane10

CTBI

OAM BlockGenerator

PCSMAC/RS

scramble

scramble

scrambleIPG DC

•••

• IPG adjustment gains enough bandwidth for inserted OAM• Introduce Deficit Counter mechanism to collect extra IPG• OAM blocks cover the extra IPG (generator)

Packet IPG Packet IPG Packet IPG Packet IPG Packet IPG Packet PacketIPG IPG Packet

64B 64B 64B64B64B64B64B64B ••• ••• 64B64B64B •••64B •••

IPG Packet IPG Packet

Continuous IPG after adjust


Page 11


Insert OAM Block by Stealing from IPG

64B

64B

64B

O

O

O

64B 64B 64B

64B 64B 64B

64B 64B 64B•••

66B

66B

66B

O

O

O

66B 66B 66B

66B 66B 66B

66B 66B 66B•••

OO OAM block after 64/66 encoding

OAM block before 64/66 encoding

64B

64B

64B

64B

64B

64B

64B 64B 64B

64B 64B 64B

64B 64B 64B•••

64B IPG Block

64B 64B64B64B64B ••• ••• 64B64B64B64B •••

• Adjusts IPG together• Distributes IPG blocks into each lane• PHY OAM replaces the IPG block on each lane

Continuous IPG after adjust


Page 12


Insert OAM Block by Increasing Line Rate

64B

64B

64B

O

O

O

64B 64B 64B

64B 64B 64B

64B 64B 64B

•••

66B

66B

66B

O

O

O

66B 66B 66B

66B 66B 66B

66B 66B 66B

•••

OOOAM block after 64/66 encoding

OAM block before 64/66 encoding

64B

64B

64B

64B 64B 64B

64B 64B 64B

64B 64B 64B

•••

• Line rate increased• PHY OAM blocks are inserted

periodically

64B 64B

64B 64B

64B 64B

64B 64B

64B 64B

64B 64B

O

O

O

O

O

O

66B 66B

66B 66B

66B 66B


Page 13


LLF&RLF Generation

Block Generator



64B/66Bencoder

66bitLane1

Lane2

Lane10

OAM BlockGenerator

PCSMAC/RS

scramble

scramble

scrambleIPG DC

Block Reassemble



64B/66Bencoder

66bitLane1

Lane2

Lane10

OAM BlockDetector

scramble

scramble

scramble

OAM (RLF)

Detect lane unavailable, transmit a Remote Link Fault signaling on transmitting path

Lane Status Detector

OAM (LLF)


Page 14


PHY OAM Indication

Block Reassemble



64B/66Bencoder

66bitLane1

Lane2

Lane10

OAM BlockDetector

scramble

scramble

scramble

• OAM Block Detector picks up the PHY OAM information on lane• Notify the PHY OMA information to upper layer

OAM

OAM

OAM

Detect OAM information and notify upper layer


Page 15


Conclusions

• PHY OAM providing monitoring status of a physical lane–Lane failure will be indicated: (LLF/RLF)–More functions may be defined by PHY OAM

• Auto Negotiate• BER monitor• information advertisement

• Implementation of PHY monitoring/PHY OAM–PHY OAM will be defined in block format–Provide lane fault detection and notification–Two options for OAM block transmission

• Option 1: utilization of IPG space• Option 2: increasing line rate to provide reliable and periodical OAM

transmission bandwidth

HUAWEI TECHNOLOGIES Co., Ltd.IEEE 802.3ba Task Force, 2008

Thank You

Phy Layer Monitoring - IEEEgrouper.ieee.org/groups/802/3/ba/public/mar08/jiang_01_0308.pdf ·...

Documents

Transcript of Phy Layer Monitoring - IEEEgrouper.ieee.org/groups/802/3/ba/public/mar08/jiang_01_0308.pdf ·...