Design Con 2015
Breaking News
Comments
Newest First | Oldest First | Threaded View
MeasurementBlues
User Rank
Blogger
Re: Testing Ethernet Compliance
MeasurementBlues   4/1/2014 8:28:54 AM
NO RATINGS
Sanjib,

In this case, the formatting of the bits into packets don;t matter. Speed experiments are done using a PRBS pattern to assure an almost random set of bits. The point is to prove that data rates are possible. What those bits represent is irrelevant here.

zeeglen
User Rank
Blogger
Re: Multimode?
zeeglen   3/31/2014 7:41:33 PM
NO RATINGS
@ DKuchta In general, 1310nm VCSELs have lower ouput power and, to date, much lower modulation speeds than 850nm devices.


Thanks, this answers my question.  Was thinking of an external modulator rather than laser keying.  Amazing that VCSELs can be directly keyed at this rate!


 

DKuchta
User Rank
Rookie
Re: Multimode?
DKuchta   3/31/2014 2:47:32 PM
NO RATINGS
Is your question about fiber properties or VCSEL poperties?

In general, 1310nm VCSELs have lower ouput power and, to date, much lower modulation speeds than 850nm devices.  In the literature, 30Gb/s over 10km of single mode fiber has been demonstrated from a 1270nm (~1310nm) VCSEL.

For 1310nm VCSELs, the single mode fiber distance will be in the 10km range, limited by either the available optical power or the spectral width.

zeeglen
User Rank
Blogger
Multimode?
zeeglen   3/30/2014 10:54:00 AM
NO RATINGS
Since the 850 nm multimode fiber lengths have such significance in the test results, wonder what would the maximum lengths be using singlemode fiber at 1310 nm?

Sanjib.A
User Rank
CEO
Testing Ethernet Compliance
Sanjib.A   3/30/2014 3:36:18 AM
NO RATINGS

While reading this article, a question just occurred to me, which I came across a few days back and I did not know the answer. To implement Fast Ethernet or Giga-bit Ethernet, we generally use the off-the-shelf processors with in-built MAC, 0ff-the-shelf PHY chips compliant to the Ethernet standard and magnetics, connectors per standard. What are the test cases which need to be done to check whether Ethernet implemented actually complied to the respective standards?



Top Comments of the Week
Flash Poll
Like Us on Facebook

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
EE Life
Frankenstein's Fix, Teardowns, Sideshows, Design Contests, Reader Content & More
Max Maxfield

Want a Voltera Desktop PCB Printer?
Max Maxfield
9 comments
I just received an email from my chum Javi in Spain. "Have you heard about Voltera (VolteraInc.com)? It's a Canadian company that is going to offer desktop-size PCB printers for fast ...

Aubrey Kagan

Have You Ever Been Blindsided by Your Own Design?
Aubrey Kagan
37 comments
I recently read GCHQ: The uncensored story of Britain's most sensitive intelligence agency by Richard J. Aldrich. The Government Communication Headquarters (GCHQ), Britain's equivalent of ...

Martin Rowe

No 2014 Punkin Chunkin, What Will You Do?
Martin Rowe
2 comments
American Thanksgiving is next week, and while some people watch (American) football all day, the real competition on TV has become Punkin Chunkin. But there will be no Punkin Chunkin on TV ...

Rich Quinnell

Making the Grade in Industrial Design
Rich Quinnell
15 comments
As every developer knows, there are the paper specifications for a product design, and then there are the real requirements. The paper specs are dry, bland, and rigidly numeric, making ...

Special Video Section
The LT8640 is a 42V, 5A synchronous step-down regulator ...
The LTC2000 high-speed DAC has low noise and excellent ...
How do you protect the load and ensure output continues to ...
General-purpose DACs have applications in instrumentation, ...
Linear Technology demonstrates its latest measurement ...
10:29
Demos from Maxim Integrated at Electronica 2014 show ...
Bosch CEO Stefan Finkbeiner shows off latest combo and ...
STMicroelectronics demoed this simple gesture control ...
Keysight shows you what signals lurk in real-time at 510MHz ...
TE Connectivity's clear-plastic, full-size model car shows ...
Why culture makes Linear Tech a winner.
Recently formed Architects of Modern Power consortium ...
Specially modified Corvette C7 Stingray responds to ex Indy ...
Avago’s ACPL-K30T is the first solid-state driver qualified ...
NXP launches its line of multi-gate, multifunction, ...
Doug Bailey, VP of marketing at Power Integrations, gives a ...
See how to ease software bring-up with DesignWare IP ...
DesignWare IP Prototyping Kits enable fast software ...
This video explores the LT3086, a new member of our LDO+ ...
In today’s modern electronic systems, the need for power ...