Upstream bandwidth usage

Fri Jun 10 01:26:33 UTC 2022

GPON is TDM (Time Division Multiplexing).  The downstream is essentially OC-48 (2.4Gbps).   The OLT sets the clock and each ONT has a specific timeslot for uploading.  Some vendors can adjust the timeslot reservations to ‘guarantee’ specific upload speeds to specific ONTs

From: NANOG <nanog-bounces+matthew=corp.crocker.com at nanog.org> on behalf of Mel Beckman <mel at beckman.org>
Date: Thursday, June 9, 2022 at 7:31 PM
To: Adam Thompson <athompson at merlin.mb.ca>
Cc: nanog at nanog.org <nanog at nanog.org>
Subject: Re: Upstream bandwidth usage
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Adam,

Your point on asymmetrical technologies is excellent. But you may not be aware that residential optical fiber is also asymmetrical. For example, GPON, the latest ITU specified PON standard, and the most widely deployed, calls for a 2.4 Gbps downstream and a 1.25 Gbps upstream optical line rate.

 -mel

> On Jun 9, 2022, at 3:08 PM, Adam Thompson <athompson at merlin.mb.ca> wrote:
> However, if you're talking about fiber service, it's pretty much pure marketing-dept-driven BS, combined with some vague justification of not letting TOR nodes or copyright-ignoring seeders/Warez-providers/etc. overwhelm the network in unexpected ways.
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