I am trying to perform some capacity planning for some of our
residential pops, but the old calcs I used to use seem useless -- as
they were adapted from the dialup days and relied upon a percentage of
users online (~50%) and a percentage of concurrent transmission (~19%).
My present scenario involves a micro-pop terminating 250 residences
where users are expecting 4 mb/s. So I am looking for some baseline to
begin at, so I am wondering what others are doing.
We have calculated our customers peak b/w usage between 20 and 60 kbps/user,
spread across a wide variety of users and wide range of speeds (128/128 up
to 15000/1000 kbps). You only need a few heavy users to skew things. But
400 at 4 Mbps would make me think that 20 to 30 Mbps would be sufficient.
I had a very educational experience with an ISP that provides two
choices to their customers: a) pay as you go (per GB charge with a
token monthly fee for keeping the port active) and b) 150GB per month
"unlimited" package
Both packages were priced with the intent to have the same cost for
customers with similar usage.
After 1 year and about 2000 customers in each package, we found that
the average consumption was 0.2 Mbps per customer in a) and 0.35 Mbps
per customer in b)
This may have changed a bit - but we used to use 2000 high speed = 100
meg of capacity. Based on 5000/800 ADSL or 8000/1000 cable modem
profiles mainly...
After 1 year and about 2000 customers in each package, we found that
the average consumption was 0.2 Mbps per customer in a) and 0.35 Mbps
per customer in b)
Although it's wise to plan for peak average, and depending on your service levels, keep enough cover room (though redundancy may provide that cover room for you) for the massive events.
After 1 year and about 2000 customers in each package, we found that
the average consumption was 0.2 Mbps per customer in a) and 0.35 Mbps
per customer in b)
4000 residential customers at an average of 1.1Gbps? Wonder what the 95th looked like. Seems a bit high.
I've seen everything from ~20 kilobit/s/user at peak, to over 400 (measured at 5 minute average with mrtg with ~500 users).
It differs a lot if you get the "mom and pop"-userbase or if you have bunch of students who are downloading/streaming stuff all the time.
Generally, comparing ADSL 8/1 to ETTH 10/10 or 100/100, download doesn't differ much, but symmetric speed users put out factor 4 more traffic (8/1 users upload half as much as what they download, ETTH users upload double what they download).