Cellular backup connections

Fri Dec 28 12:29:08 UTC 2018

It's strange. When we use T-Mo on an andriod device the ping times are
30-40 ms. When we try with the modem + raritn console box it jumps to min
of 100+ ms (the modem is high up on top of the rack and we test with the
phones we are on the floor) - Can 5 feet higher make it that much worse?

On Fri, Dec 28, 2018 at 7:23 AM Brandon Martin <lists.nanog at monmotha.net>
wrote:

> On 12/28/18 7:06 AM, Dovid Bender wrote:
> > Hi All,
> >
> > I finally got around to setting up a cellular backup device in our new
> > POP. I am currently testing with T-Mobile where the cell signal strength
> > is at 80%. The connection is 4G. When SSH'ing in remotely the connection
> > seems rather slow. Ping times seem to be all over the place (for
> > instance now I am seeing: rtt min/avg/max/mdev =
> > 174.142/336.792/555.574/99.599 ms) . Is that just cellular or is that
> > more related to the provider and the location where I am? I could in
> > theory test with VZ and ATT as well. With Verizon they charge $500.00
> > just to get a public IP and I want to avoid that if possible.
> >
> > Thanks and sorry in advance if this is off topic.
>
> LTE with a good connection on a lightly loaded cell should be
> significantly less than that in both absolute terms as well as jitter.
>
> I used LTE (Sprint) for a couple years as my primary connectivity when I
> moved out into an area with zero connectivity (fixing that now).  I
> typically saw ~30-40ms to Chicago, which is the nearest major carrier
> PoP.  Jitter was typically less than 10ms.  VoIP was usable.  Others in
> the area on other carriers have reported similar.
>
> Sprint gave me a public IP with no up front charges but did charge $5/mo
> for it.
>
> As you're probably aware, the "signal strength" ("bars") indicators that
> are presented to the consumer-facing interfaces are often very cooked.
> Depending on which RSSI you're looking at, a "very good" signal is
> probably in the realm of -70dBm to -110dBm (note that there are two RSSI
> metrics commonly used with LTE, and they tend to differ by ~20dB).
>
> --
> Brandon Martin
>
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