[189304] in North American Network Operators' Group
Re: Cost-effectivenesss of highly-accurate clocks for NTP
daemon@ATHENA.MIT.EDU (Mel Beckman)
Sun May 15 23:12:59 2016
X-Original-To: nanog@nanog.org
From: Mel Beckman <mel@beckman.org>
To: joel jaeggli <joelja@bogus.com>
Date: Mon, 16 May 2016 03:12:51 +0000
In-Reply-To: <72866b4c-a0eb-8fa3-8a28-5520e1b24ef4@bogus.com>
Cc: "nanog@nanog.org" <nanog@nanog.org>
Errors-To: nanog-bounces@nanog.org
Joe and Eric,
It's frustrating how far public safety technology lags behind what Industry=
can actually deliver. It's the same in aviation. Institutions are slow to =
adopt new tech due to fears about reliability, and and unwillingness to tak=
e any risk at all. So PS and aviation capabilities lag horribly. This is w=
hy commercial pilots, tired of waiting on the FAA, are buying their own tab=
lets and running non-certified navigation tools. And police officers use ce=
llular data connection with VPN to query wants and warrants databases.=20
-mel beckman
>> On May 15, 2016, at 5:28 PM, joel jaeggli <joelja@bogus.com> wrote:
>>=20
>>> On 5/15/16 10:05 AM, Eric S. Raymond wrote:
>>> Mel Beckman <mel@beckman.org>:
>>> The upshot is that there are many real-world situations where
>>> expensive clock discipline is needed. But IT isn't, I don't think,
>>> one of them, with the exception of private SONET networks (fast
>>> disappearing in the face of metro Ethernet).
>>=20
>> Thank you, that was very interesting information. I'm not used to think=
ing
>> of IT as a relatively low-challenge environment!
>>=20
>> You're implicitly suggesting there might be a technical case for
>> replacing these T1/T3 trunks with some kind of VOIP provisioning less
>> dependent on accurate time synch. Do you think that's true?
>=20
> APCO and TETRA trunked radio are mature systems, they do carry data,
> but are somewhat lower bandwidth. Being TDM they are dependent on
> accurate clocks.
>=20
> LTE systems are used or envisioned being used for high bandwidth
> applications.
>=20
>=20
>=20
