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Fiber lover

@paxio.net

Google not symmetric?

I understood google fiber used GPON. If so, their offering couldn't be symmetric.

Skippy25

join:2000-09-13
Hazelwood, MO
Maybe you should doing a little reading to further your understanding.

xenophon

join:2007-09-17
reply to Fiber lover
»www.gfiberforum.com/forum/thread···-or-GPON

quote:
John Toccalino, project manager, explains that being installed in various parts of the city a few huts or nodes called Google Fiber Huts. Inside house the OLT equipment that connect the pairs of fiber, which then hung from utility poles, reach every home. For its explanation, we understand that Google is not using a GPON network like the one in Spain is installing Telefónica.

Google does reach each individual fiber from Google Hut Fiber to the home. The main advantage is that each line is independent and can use their full capacity for a single user. The disadvantage is that a deployment of this type is more expensive than the displays in a tree, as used by Telefonica, in which each fiber coming from the OLT is divided into several stages into sub-segments by splitters, so that all Users are both the same optical signal, but each uses it only for the fraction of time allocated to it.

With this architecture, the network of Google not only provides 1 Gbps to each user, but this is symmetrical, which would be impossible in a GPON deployment, having to share all the users upload rate up to 1, 25 Gbps

Sammer

join:2005-12-22
Canonsburg, PA
said by xenophon:


With this architecture, the network of Google not only provides 1 Gbps to each user, but this is symmetrical, which would be impossible in a GPON deployment, having to share all the users upload rate up to 1, 25 Gbps

Actually 1 Gbps symmetrical is possible with a GPON (2.5 Gbps / 1.25 Gbps theoretical) deployment but it might be seriously oversubscribed if 32 customers sharing the same optical fiber all went online at exactly the same time.