From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-iy0-f171.google.com (mail-iy0-f171.google.com [209.85.210.171]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority" (verified OK)) by huchra.bufferbloat.net (Postfix) with ESMTPS id 0E7F020036C for ; Sat, 17 Mar 2012 13:53:32 -0700 (PDT) Received: by iadj38 with SMTP id j38so12987016iad.16 for ; Sat, 17 Mar 2012 13:53:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=subject:mime-version:content-type:from:in-reply-to:date:cc :message-id:references:to:x-mailer; bh=BwqCMuGiVBsvrM3grdIVb1V6jOZfWREPu6rFOMp8NA8=; b=wGv+e+r3+pioH0ZzzCJyAPfWj8WQaGsfzyFsp5W8+BnL7UyRSPTZN2KGQqZpwaDuUK Z9z1tf/Sx3EXJsHetLR7n5SaTdTzXakZfrnJUqLF64WYohVPFOVJmiunEwMHcLRWm7/7 5kq2ClrFaUf4K+8kwEElP4dWXyHAaqCY2rqTdSiDJZnOnjNU+Bf9Yb8f1N1hdeHu567U FVZMLG9UlLEm5ei/+ZEcsHRye5oj7tXEkRRGrnLIiTVDttY5Om7fl+DoAvVIBC69sday 0M1J3TOXCi9gt+qtOnBynUsHvg5GYWuffq0RnwV+Wu8l+Y37kBwm3AmNUGvpb8ovsrQT vovw== Received: by 10.50.202.69 with SMTP id kg5mr1635273igc.7.1331978006044; Sat, 17 Mar 2012 02:53:26 -0700 (PDT) Received: from andrewm-lo.lan (136.236.69.111.dynamic.snap.net.nz. [111.69.236.136]) by mx.google.com with ESMTPS id rd7sm1546592igb.14.2012.03.17.02.53.22 (version=TLSv1/SSLv3 cipher=OTHER); Sat, 17 Mar 2012 02:53:24 -0700 (PDT) Mime-Version: 1.0 (Apple Message framework v1257) Content-Type: multipart/signed; boundary="Apple-Mail=_4AE2F726-10B8-49A2-B6A0-3D42E02EDAEB"; protocol="application/pkcs7-signature"; micalg=sha1 From: Andrew McGregor In-Reply-To: <20120317064513.GA3482@thyrsus.com> Date: Sat, 17 Mar 2012 22:53:18 +1300 Message-Id: <1014E797-3720-4CD3-B2A9-2E70DA1D7C77@gmail.com> References: <20120317064513.GA3482@thyrsus.com> To: esr@thyrsus.com X-Mailer: Apple Mail (2.1257) Cc: thumbgps-devel@lists.bufferbloat.net Subject: Re: [Thumbgps-devel] PPS over USB Serial can work X-BeenThere: thumbgps-devel@lists.bufferbloat.net X-Mailman-Version: 2.1.13 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 17 Mar 2012 20:53:32 -0000 --Apple-Mail=_4AE2F726-10B8-49A2-B6A0-3D42E02EDAEB Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=iso-8859-1 I probably can, but it might be three weeks or so given my schedule. Andrew On 17/03/2012, at 7:45 PM, Eric S. Raymond wrote: > Andrew McGregor : >> I decided to try a practical experiment, to prove one way or another = if USB=20 >> serial PPS on a consumer router can work, and how well. >>=20 >> Short summary: it works, jitter is at the 300 =B5s level. >=20 > Excellent! >=20 > Any chance you can run a similar test with a PL2303? The FTDI SIO is = only=20 > the second-most-likely converter to wind up in our device. I see = PL2303 > breakout boards are available for < $10 on eBay, though you might have = to work > a bit to find one that has pins for the handshake lines on the input = side. > --=20 > Eric S. = Raymond --Apple-Mail=_4AE2F726-10B8-49A2-B6A0-3D42E02EDAEB Content-Disposition: attachment; filename=smime.p7s Content-Type: application/pkcs7-signature; name=smime.p7s Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIFLjCCBSow ggQSoAMCAQICEQDMQ2ZKvgsUYA5oQg5SjWfVMA0GCSqGSIb3DQEBBQUAMIGTMQswCQYDVQQGEwJH QjEbMBkGA1UECBMSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdTYWxmb3JkMRowGAYDVQQK ExFDT01PRE8gQ0EgTGltaXRlZDE5MDcGA1UEAxMwQ09NT0RPIENsaWVudCBBdXRoZW50aWNhdGlv biBhbmQgU2VjdXJlIEVtYWlsIENBMB4XDTExMTAwMTAwMDAwMFoXDTEyMDkzMDIzNTk1OVowJTEj MCEGCSqGSIb3DQEJARYUYW5kcmV3bWNnckBnbWFpbC5jb20wggEiMA0GCSqGSIb3DQEBAQUAA4IB DwAwggEKAoIBAQC+buTRxzSXTQmMyUqaokLJit3xU5WVudxHijhKbGRSTgJ867L/v8+rNhSoFwCV MdKIu/M7apWgGkkA+MT/LjDFj63jLT+4nTTLIojXZdoezbpp/rQ2ViSbi54AjhZBQ5X+yH2xcXmG KpDhZjeZC1bvKNvBtdOHCAcrx1Ys1BNj+AhwridEX/KD0cq5xSsJhjDggF6XSUOsaiqBHR6fiQMi 7gH8EuFBh83oklb/pdreg1fQ7gKJk/Me/atIbE1gtbIR88oaCtXoHfZxgkFwagwMtBHdkxN+wcZy 9xx78el9Lxrjx2nMq50hRlj/bqg/m4rSox7//DKfx7bfKNZAiSMDAgMBAAGjggHkMIIB4DAfBgNV HSMEGDAWgBR6E04AdFvGeGNkJ8Ev4qBbvHnFezAdBgNVHQ4EFgQUXOXqNkq6sNbrD8B41dPko8Gs JucwDgYDVR0PAQH/BAQDAgWgMAwGA1UdEwEB/wQCMAAwIAYDVR0lBBkwFwYIKwYBBQUHAwQGCysG AQQBsjEBAwUCMBEGCWCGSAGG+EIBAQQEAwIFIDBGBgNVHSAEPzA9MDsGDCsGAQQBsjEBAgEBATAr MCkGCCsGAQUFBwIBFh1odHRwczovL3NlY3VyZS5jb21vZG8ubmV0L0NQUzBXBgNVHR8EUDBOMEyg SqBIhkZodHRwOi8vY3JsLmNvbW9kb2NhLmNvbS9DT01PRE9DbGllbnRBdXRoZW50aWNhdGlvbmFu ZFNlY3VyZUVtYWlsQ0EuY3JsMIGIBggrBgEFBQcBAQR8MHowUgYIKwYBBQUHMAKGRmh0dHA6Ly9j cnQuY29tb2RvY2EuY29tL0NPTU9ET0NsaWVudEF1dGhlbnRpY2F0aW9uYW5kU2VjdXJlRW1haWxD QS5jcnQwJAYIKwYBBQUHMAGGGGh0dHA6Ly9vY3NwLmNvbW9kb2NhLmNvbTAfBgNVHREEGDAWgRRh bmRyZXdtY2dyQGdtYWlsLmNvbTANBgkqhkiG9w0BAQUFAAOCAQEAgmf81vnsAnbcmIAyyqvEKxAK jRHerfreN10DK1ISkUJ//U4uffQV8sAGDtyIErzVFsW6NYRmFCMSE20M1ffbFpWUmXCtm/YTlkf1 5STVjTMNshDzMDhpjx99Z2J5RBJPZpXjwmpQnfKwB7zft9TcUSIb9FvZm33EKdF/XlS12U4Q9fsj 2shZf88RituX2+fCWfHoTWiFEhFUkLRtWf1YpgHpEXr82nqROxs/aWNlqtLnwTTu2ULr/WpUaRDs kom8gFZkMgw5kRfLpSXRrCFSORsZzkH2ooRxaJY7wMwZaCUS1am9DuwVy7gehoc3ZsjsDkMObZeu kx7Cg7GxIkgo+zGCA64wggOqAgEBMIGpMIGTMQswCQYDVQQGEwJHQjEbMBkGA1UECBMSR3JlYXRl ciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdTYWxmb3JkMRowGAYDVQQKExFDT01PRE8gQ0EgTGltaXRl ZDE5MDcGA1UEAxMwQ09NT0RPIENsaWVudCBBdXRoZW50aWNhdGlvbiBhbmQgU2VjdXJlIEVtYWls IENBAhEAzENmSr4LFGAOaEIOUo1n1TAJBgUrDgMCGgUAoIIB2TAYBgkqhkiG9w0BCQMxCwYJKoZI hvcNAQcBMBwGCSqGSIb3DQEJBTEPFw0xMjAzMTcwOTUzMThaMCMGCSqGSIb3DQEJBDEWBBQLzsvY uc9wgPRzICxRT5BEmhclITCBugYJKwYBBAGCNxAEMYGsMIGpMIGTMQswCQYDVQQGEwJHQjEbMBkG A1UECBMSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdTYWxmb3JkMRowGAYDVQQKExFDT01P RE8gQ0EgTGltaXRlZDE5MDcGA1UEAxMwQ09NT0RPIENsaWVudCBBdXRoZW50aWNhdGlvbiBhbmQg U2VjdXJlIEVtYWlsIENBAhEAzENmSr4LFGAOaEIOUo1n1TCBvAYLKoZIhvcNAQkQAgsxgayggakw gZMxCzAJBgNVBAYTAkdCMRswGQYDVQQIExJHcmVhdGVyIE1hbmNoZXN0ZXIxEDAOBgNVBAcTB1Nh bGZvcmQxGjAYBgNVBAoTEUNPTU9ETyBDQSBMaW1pdGVkMTkwNwYDVQQDEzBDT01PRE8gQ2xpZW50 IEF1dGhlbnRpY2F0aW9uIGFuZCBTZWN1cmUgRW1haWwgQ0ECEQDMQ2ZKvgsUYA5oQg5SjWfVMA0G CSqGSIb3DQEBAQUABIIBAL0z9jcBIOE7ZTr/87StvuRoVpwXjjXFkiGh7y3iCs7bCFRlY3jkxU+t 2WF4clQATQD0ujmwkYcci9Iax2JceQVsygNYma8lQA/4SDCjmbFmTlFEXw4Q9y7fTQVW4XYahwIA MXOkvSffgnvg6jfOISxItVWDTjBrU6LlzBZZfoFLLQIG2wUA6yzRg6qrKpbarpx5ZNLpXqnkowzd xU3Ly2WG4MR7VzMXZy/uyEI0n0hg3FIkKY7Cl/JwDSuZqMN9EnyYP1hTSOIUhAWePwjnhUVrkYzY 9QrkFJUrH7J2T6GeXd7VPS7fJlxJuFfRy+Dk1sg5mRpYnCEEBA/gn0I2+G8AAAAAAAA= --Apple-Mail=_4AE2F726-10B8-49A2-B6A0-3D42E02EDAEB--