The Five Things You Need to Know Before Migrating to 40 100G Speeds

The Five Things You Need to Know Before Migrating to 40/100G Speeds

December 14, 2011

©2011 CABLExpressAll rights reserved. All trademarks are property of their respective owners.

Today’s Agenda

• An archived version of this webinar will available at www.cablexpress.com/webinars by Dec 21st.

• Presentation Agenda:

– Introductions

– The Five Things You Need to Know Before Migrating to 40/100G Speeds

– Conclusion/Q&A

• Presented by:

– Kent Goldsmith, Engineering Manager, CABLExpress

– Josh Taylor, Senior Product Manager, CABLExpress


http://www.cablexpress.com/webinars

The connector of choice

• MPO style connector

– Multimode vs. Singlemode

– Parallel vs. Serial Transmission

– Transceivers

The Five Things You Need to Know Before Migrating to 40/100 G Speeds

#1: Choosing a Connector

Multimode vs. Singlemode

• We have choices:

– Distance

– $$$



Parallel vs. Serial Transmission

• Serial Transmission

– Duplex transmission

– Speed limitations

Typical 1G Transceiver The LC duplex




• Parallel

– Multiple fibers

– MPO style connector

100G parallel optics

40G parallel optics



Parallel vs. Serial TransmissionRX TX RX TX




100G Ethernet40G Ethernet



Transceivers

Xena Networks CF-X12-C11901-01 100G Ethernet CFPTransceiver Module

100G transceiver

Typical 1G/10G Transceiver



Link Distances and Loss Amounts

• Max Link Lengths

– OM3 = 100M

– OM4 = 150M

• Max Loss Budgets

– OM3 = 1.9dB

– OM4 = 1.5dB


#2: Total Link Distance and Loss Budget

10GB IEEE Loss Budget: 2.6dBSkinny-Trunk® Maximum Loss Budget: 1.55dB

Headroom : 1.05dB

H Series Module

.4dB

Z Mount.35dB

H Series Module

.4dB

H Series Module

.4dB







What is Skew?

skew

Skew: The difference between arrival times of the parallel transmitted signal as they reach the receiver on the other end.

79 nanoseconds = 0.000000079 seconds


#3: Skew

Skew is not an issue with CABLExpress Skinny-Trunk products…why?

• The 802.3ba standard specifies 79 nanoseconds (79,000 picoseconds)

• The devices that measure skew do it in picoseconds

• 8 picoseconds is a typical skew measurement

• The standard calls for a 79,000 ps maximum

• Typical skew numbers are nowhere near that

• Conclusion: Skew is not an issue (when working with CABLExpress)!


#3: Skew

What Bandwidth “Glass”?


#4: What bandwidth glass?

TIA 802.3baPhysical Layers for 40Gb/s and 100Gb/s

OM3

• 100 meter Link Limit

OM4

• 150 meter Link Limit

The benefit of OM4 is 50m more distance.



Producing OM4 LASER Optimized Glass

• OM2 glass is intentionally drawn from a different production source

• Both OM3 and OM4 glass are produced (drawn) from the same production source

• The goal of this manufacturing process is to produce OM4 grade glass

– Most of what is produced is OM3 grade

– That’s why OM4 is more expensive

– OM4 glass can be 30% to 40% more than OM3

– This is changing as the manufacturing process is improved



• If managed properly, you DON’T have to think about it

• If not, it can cause major issues

• There are 3 methods recognized by TIA-568-C.01. Method A

2. Method B

3. Method C

• Try and deploy only 1 method per site.

Polarity (Light Path): Polarity maintains working optical link


#5: Light Path

Duplex Parallel

Method A • Different jumpers are needed for this method • For parallel signals, an extended trunk will most likely be needed for workability, but necessary for link


#5: Light Path

Duplex Parallel

Method B• Only method deploying MPO key up/key up couplers…doesn’t work for singlemode (will run into problems

with singlemode because of angle polish on MPO)• For parallel signals, an extended trunk will likely be needed for workability


#5: Light Path

Duplex Parallel

Method C• For parallel signals, an extended trunk will most likely be needed for workability,

but necessary for link


#5: Light Path

Polarity (Light Path): Conclusion

• Duplex hardware is in position now, future parallel hardware will likely be placed at a different location…extender trunks will be necessary

• All 3 methods are forward compatible regarding parallel signals

• Try not to mix deployment methods at the same site, this can lead to confusion

• Method C was the first method to be used in the industry

• Method C is the method with the fewest amount of issues


#5: Light Path

Questions from the Audience?


THANK YOU!

www.cablexpress.com


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The Five Things You Need to Know Before Migrating to 40 100G Speeds