Muni fiber: L1 or L2?

Fri Feb 1 22:17:26 UTC 2013

On 13-02-01 16:03, Jason Baugher wrote:

> The reason to push splitters towards the customer end is financial, not
> technical.

It also has to do with existing fibre infrastructure. If a Telco has
already adopted a "fibre to a node" philosophy, then it has a;ready
installed a limited number of strands between CO and many neighbouhoods.

It makes sense to standardise on one technology. And if that technology,
because it is used by many, ends up much cheaper due to economies of
scale, it makes sense to adopt it.

And remember that it isn't just the cable. You need to consider the OLT
cards. An OLT card can often support a few GPON systems each passing 32
homes.

With 1 strand per home, you take up one port per home served. (possibly
per home passed depending on deployment philosophy). So you end up
needing far more cards in an OLT to serve the same number of people.
More $$$ needed.

GPON isn't suited for trunks. But for last mile, is it really so bad ?
2.mumble gpbs of capacity for 32 homes yields 62mbps of sustained
download for each home. (assuming you have 32 homes conected and using
it at same time)

If you have multicast and everyone is watching superbowl at same time,
you're talking up very little bandwidth on that 2.mumble GPON link.