Planning 10G PON
JU LY/ A UG 201 2 5 ®
DAVID RUSSELL is solutions
marketing director at Calix .
By DAVID RUSSELL
The right strategy
on whether you expect
to use 10G EPON
C OMMERCIAL deployments
of 10- Gbps passive optical
networks ( 10G PONs) are
just in their infancy. But all service
providers need to plan now how they
will deploy these new technologies
on top of their existing networks.
Luckily, the working groups that
created these standards, the ITU
( FSAN) and IEEE, took into account
carriers’ network migration concerns.
A few simple planning steps today
should eliminate a lot of headaches
down the road when service providers
are ready for 10G PONs.
10G PON standards
To understand the 10G PON
migration strategies, it is helpful
to have a basic understanding
of the 10G PON standards.
10G EPON. The first completed
10G standard was IEEE 10G EPON
( 802.3av) in September 2009. The
vendor community has completed
technology development based
on this standard, and products
are now commercially available.
IEEE 10G EPON supports both
10G downstream/ 10G upstream
as well as a 10G downstream/ 1G
upstream formats. In both cases,
the downstream transmission
uses a 1577- nm wavelength. In the
upstream, the 10G version uses
1270 nm and the 1G uses 1310
nm ( from 1260 nm to 1360 nm).
10G GPON ( G. 987). The ITU
ratified the 10G GPON standard,
officially known as XG- PON (“ X”
being Roman numeral 10), in June
2010. There are as yet no known
commercial deployments. The
IEEE and the ITU coordinated
on their wavelength selection,
so XG- PON uses 1577 nm in the
downstream and 1270 nm for the
upstream. Figure 1 diagrams the
10G EPON and GPON standards.
FSAN, which acts as a working
group for the ITU on PON standards,
continued to work on a standard
beyond XG- PON. This standard
is referred to as NG- PON2. A
variety of technologies have been
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