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Resilient Synchronous Gigabit Ethernet for True 4G

Mobile Backhaul Network

Over the next several years, LTE

worldwide deployments bymobile operators will continue togrow in support of the increasedbandwidth demands being drivenby new data services.

According to Ciscos recentpro!ections, there will be a "#$compound growth rate in mobiledata traffic from #%&% to #%&'and '.( billion personal devices

will be connected to mobilenetwor)s by #%&'. #* and +*service subscriptions will bearound for uite some timealthough this number will dropsteadily with the growing adoption of -*LTE services, according to /nfonetics0esearch 1www.infonetics.com2. 13ee 4igures & and #.2

Connection speeds of mobile devices increase with each new generation5 #*,+* and -* mobile devices are designed to handle speeds of #+% )bps, &-6bps and & *bps, respectively resulting in a &'7fold increase in bandwidth

capacity reuirements as more subscribers convert to -* services.

8uilding the next generation mobile networ) in support of these trendsreuires careful consideration of all the building bloc)s that ma)e up thenetwor). 6obile bac)haul is a critical component, playing a pivotal role in theoverall performance of the networ). /t connects to multiple cell sitessupporting thousands of roaming subscribers and must efficiently handlechanging traffic patterns.

The widely deployed T96 and circuit7switched bac)haul networ)s, such as3O:ET39; are recogni

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bac)haul networ) = one that is capable of providing simultaneous support formultiple generations of high uality services = while efficiently handling theexponential increase in data traffic that will traverse the networ).

A true -* Ethernet mobile bac)haul networ) must meet three fundamental

design reuirements = resiliency that provides five "s availability,synchroni

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Resiliency

An important component to achieving five nines availability is through theimplementation of pac)et ring resiliency protocols, namely, /T>7T *.?%+# and04C +(&" Ethernet Automatic @rotection 3witching 1EA@32 both at the cellsite for microwave access rings and at cell site aggregation for theimplementation of multiple resilient Ethernet rings. *.?%+# and EA@3 provideprotection switching5 EA@3 is a proven technology currently deployed inthousands of service provider networ)s around the world today and*.?%+# isa standard that builds on the proven success of EA@3. 9epending on the

reuirements, mobile operators with EA@3 already deployed in their networ),can choose to migrate to *.?%+#.

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Synchronization3ynchroni9@2 and utili