From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ed1-x530.google.com (mail-ed1-x530.google.com [IPv6:2a00:1450:4864:20::530]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by lists.bufferbloat.net (Postfix) with ESMTPS id C87663B29D for ; Thu, 13 Jan 2022 10:28:27 -0500 (EST) Received: by mail-ed1-x530.google.com with SMTP id o6so24469059edc.4 for ; Thu, 13 Jan 2022 07:28:27 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=79VrHs4fQTP3pbLHls2LsEU8CcMB02Mvtm1sw6i9QAs=; b=M6Dr8LPUwd/iiAMoByhAa95nL6N/gsxcWSNyfvqdAaOWmYEflxnkBLvjBI0iXtbUBN ACBXTFJZtqcLKUwP2KKx7J7X3nCWdYJHExARvWmKb8NYv4zSaJ2kIWYV+UtzgqOZZMIw oJ47z+HmitwexpjDC1P4VjOe+CHsZnVidBrRq2pjEf5jNKx7FwiZVNG9IJH4iQokcEn6 PxP8MJOkJar1LCrDGHkDlonXZK0FprCD0TN14QFBuPCISlsGhEBT02j2BiFPhqRsuf0k yidAqXX3ZkdW5RmurWx3u7osL3btnua/O4pBzqc9MxriMO1gUaHh4LSSt3BMvI0hyBP+ 5Ubw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=79VrHs4fQTP3pbLHls2LsEU8CcMB02Mvtm1sw6i9QAs=; b=tK4i/lOt4qyfSAlJADwQowG5Cxt4g63Am1d11MsU9NsagGtpTshmSfiTMXOOmHWYl7 dyKiTq5E6lS/l+w6p1S0qcQzwDiVN+v+sQ6VOD7EZeghA7dilI7w80sChN+lFrRCes3m e5fEKv/XJ8fpJM329h4bZca+k0xbzAuxO+2thKPOLdRFo9bHtef6bhuS7V5cJKsctzyU SPF9dCpjSR4z92dfJBBTIZ4QWmAVZzqw8Ap/5sQMOCPtJ1ERRshAopKzFTwnmT0LyorF V78sTnJSMK0qTaFgIkNuvStBiL5ntsGFVkhLFcJXKE/8dzVhrQdYSj+N+yymk+wrXQ8u xmkA== X-Gm-Message-State: AOAM5308TwKm46gAw+7nH5gitPlOmmuv0YrEbFuqn7WA5yvLyLabmh6O /tc7A9Xp9y5ksl7/R4ViR7fPT06/8WwGn57I25SVFpjk X-Google-Smtp-Source: ABdhPJxjnGmD855AUutF9Mf/iv/qtbmyvVKpVy1h2FaZLQXQVJrCfmCsE/zikcvAiRZvD3DGhax6DQPqO/xDZUjQiik= X-Received: by 2002:a17:907:9085:: with SMTP id ge5mr3998417ejb.128.1642087706706; Thu, 13 Jan 2022 07:28:26 -0800 (PST) MIME-Version: 1.0 References: <6D533A43-C4E9-4D48-BC9B-26630F1E17F5@gmx.de> In-Reply-To: From: Dave Taht Date: Thu, 13 Jan 2022 07:28:13 -0800 Message-ID: To: Sebastian Moeller Cc: cerowrt-devel Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Subject: Re: [Cerowrt-devel] a smart SFP X-BeenThere: cerowrt-devel@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: Development issues regarding the cerowrt test router project List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 13 Jan 2022 15:28:28 -0000 yes, well, I dislike intensely the implications of not-so-intelligently splitting those 128 terminals is, and was pleased to see there was support at least, for hardware flow control on the uplink side in the spec. Since we've fixed dsl, cable, and wifi, getting gpon more right has increasingly been on my mind... so pulling a testbed together of some sort would be cool, and for that matter, having a SFP that could go right into a SFP enabled home router rather than a separate unit seems like a good idea, also. On Thu, Jan 13, 2022 at 6:51 AM Sebastian Moeller wrote: > > Yes sorry, > > in GPON you have the unit at the telco side, often called OLT (optical li= ne termination/terminal or similar, which feeds the whole segment of up to = ~128 remote terminals and receives data from all) the passive splitter (if = any) and the remote customer units that are called either ONU or ONT, but t= hat are just two names for the same unit (not sure who uses which nomenclat= ure, the local incumbent seems to prefer ONU, but their marketing name is G= lasfasermodem, which just translates to fiber-modem). Nomenclature seems ot= be consistent for the whole PON family, so in XG-PON or XGS-PON the unit a= pparently still are called OLT and ONU/ONT. And given that PON requires som= e smarts and configurability of the ONUs these tend to be small computers i= n their own right with their own little (or not so little) OSes. > > Regards > Sebastian > > > > > On Jan 13, 2022, at 15:38, Dave Taht wrote: > > > > And a gpon onu > > > > https://www.fs.com/products/133619.html > > > > On Thu, Jan 13, 2022 at 6:23 AM Sebastian Moeller wro= te: > >> > >> That is similar to what happens in some GPON-ONT SFPs, some run a full= small Linux distribution like OpenWrt inside.... though for ethernet that = is unexpected. > >> This is also similar to SFP VDSL "modems" which likely run their own e= mbedded OS as well inside the SFP package (at a time there was even a PCI V= DSL2 "modem" that was actually running its own embedded system on the PCI b= oard, IIRC, it pretended to the main computer to be an ethernet NIC). > >> > >> Regards > >> Sebastian > >> > >> > >> > >>> On Jan 13, 2022, at 15:18, Dave Taht wrote: > >>> > >>> running linux, of course. > >>> > >>> https://blog.benjojo.co.uk/post/smart-sfp-linux-inside > >>> > >>> -- > >>> I tried to build a better future, a few times: > >>> https://wayforward.archive.org/?site=3Dhttps%3A%2F%2Fwww.icei.org > >>> > >>> Dave T=C3=A4ht CEO, TekLibre, LLC > >>> _______________________________________________ > >>> Cerowrt-devel mailing list > >>> Cerowrt-devel@lists.bufferbloat.net > >>> https://lists.bufferbloat.net/listinfo/cerowrt-devel > >> > > > > > > -- > > I tried to build a better future, a few times: > > https://wayforward.archive.org/?site=3Dhttps%3A%2F%2Fwww.icei.org > > > > Dave T=C3=A4ht CEO, TekLibre, LLC > --=20 I tried to build a better future, a few times: https://wayforward.archive.org/?site=3Dhttps%3A%2F%2Fwww.icei.org Dave T=C3=A4ht CEO, TekLibre, LLC