Synchronous Ethernet White Paper V051310
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Transcript of Synchronous Ethernet White Paper V051310
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Synchronous
Ethernet
Synchronous Ethernet Transport
over the E-Link 1000EXR
E-Band Communications Corp.
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E-Band Communications Corp. 2 Phone: +1-858-408-066010095 Scripps Ranch Ct, Suite A Fax: +1-858-408-0655
San Diego, CA 92131 USA www.e-band.com 2010 E-Band Communications Corp. V051310
Synchronous Ethernet Transport over E-Link 1000EXR
The E-Link 1000 radio family is capable of transporting Synchronous Ethernet using thecurrently implemented methods covered in IETF 1588 and ITU-G.8261, and other methods using
Adaptive Clock Recovery. Each of these methods maintain clock synchronization that eitheruses characteristics of the GigE line coding scheme (8B/10B) or an exchange of timing
information (consisting of packets) between network elements. The E-Link solution sends theraw Gigabit Ethernet data bits over the air without inspecting any of the bits or packets. We do
not affect the timing these bits represent. E-Link keeps the entire payload in its native format
and transparently sends those bits across to the other end of the link. Any timing, jitter, orwander is detected by the network elements, using the above methods, and changes are
automatically compensated for.
E-Band Communications Corp. has tested E-Link radios with a large PWE vendor that supportsall three of these protocols, and all were passed/approved. The clock recovery results presentedbelow are compared to the G.823 Sync mask taken from section 6.2.3 of G.823. This mask is
actually meant to be used with E1 signals but it provides a point-of-reference for this document.
Table 3/G.8261 - Case 2A: 2048 kbit/s interface wander budget
Observation Interval
(sec)
MTIE requirement
(s)
0.1
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E-Band Communications Corp. 3 Phone: +1-858-408-066010095 Scripps Ranch Ct, Suite A Fax: +1-858-408-0655
San Diego, CA 92131 USA www.e-band.com 2010 E-Band Communications Corp. V051310
The following pages show the graphs from the Agilent Test set use to test the clocking. As you
can see, in all three cases, our device performs better than required.
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E-Band Communications Corp. 4 Phone: +1-858-408-066010095 Scripps Ranch Ct, Suite A Fax: +1-858-408-0655
San Diego, CA 92131 USA www.e-band.com 2010 E-Band Communications Corp. V051310
Synchronous Ethernet Clock Recovery Test Results
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E-Band Communications Corp. 5 Phone: +1-858-408-066010095 Scripps Ranch Ct, Suite A Fax: +1-858-408-0655
San Diego, CA 92131 USA www.e-band.com 2010 E-Band Communications Corp. V051310
IEEE 1588 Clock Recovery Test Results
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E-Band Communications Corp. 6 Phone: +1-858-408-066010095 Scripps Ranch Ct, Suite A Fax: +1-858-408-0655
San Diego, CA 92131 USA www.e-band.com 2010 E-Band Communications Corp. V051310
Adaptive Clock Recovery Test Results
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E-Band Communications Corp. 7 Phone: +1-858-408-066010095 Scripps Ranch Ct, Suite A Fax: +1-858-408-0655
San Diego, CA 92131 USA www.e-band.com 2010 E-Band Communications Corp. V051310
About E-Band Communications
E-Band Communications Corporation is the leading supplier of ultra-high capacity 70/80GHz wireless solutions, serving 4G carriers (WiMAX, LTE) and enterprises. In 2009, E-Band achieved the highest market share in the U.S., based on publicly available annualFCC license data. A key advantage is its Monolithic Microwave Integrated Circuit(MMIC) technology originally designed for high-end military applications and now underexclusive field-of-use license from a major defense contractor. E-Band's investorsinclude Avalon Ventures, Hercules Technology Growth Capital, Reliance ADA Group,ADC Telecommunications, Investec, Express Ventures, OpenAir Ventures and a top-
three U.S. telecommunications carrier.
www.e-band.com
E-Band Communications Corp. Phone: +1-858-408-066010095 Scripps Ranch Ct, Suite A Fax: +1-858-408-0655San Diego, CA 92131 USA
