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Broadband
Passive optical networks (PONS)
There are only passive distribution components in a
PON bus network topology - resulting in a reliable network.
In case of a power failure, only the local network element
is affected. Some advantages of PON:
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It is better than SDH, SONET for point-to-multipoint
or bus topology.
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It has flexible combination configurations. Splitters
can be either close to the subscribers or to the
exchange. Multiple levels of splitting can be performed.
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It is able to cost effectively fill the gaps between
COs.
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It widens the SDH ring and extends the service area.
PON covers an area up to 120km wide, widening the
coverage of SDH rings. It is suitable for islands
and for expanding city rings into the suburbs.
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It delivers multiservice interfaces such as 10BT,
100BT, E1, FE1, T1, FT1, V.35, Nx64K, BRI-/PRI-ISDN
and POTS.
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It integrates the existing metropolitan SDH rings
and delivers multiple services. It fills the gap
of the existing range, extends the service delivery
range and delivers multiple services typically up
to 20km.
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It is reliable and cost-effective. Passive optical
splitters reduce maintenance and operation costs
by eliminating power supply and unreliable add/drop
multiplexers (ADMs).
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It effectively loads ring traffic. PON easily accommodates
the extra bandwidth by directly connecting to a
backbone ADM.
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It allows fiber-redundancy protection.
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