rlawsha
join:2008-02-05
| Adtran Total Access 238 DSL Latency?
We have ten schools in our town that all connect with Adtran Total Access 238 DSL units. Actually all these schools connect to the phone company and from the phone company is a 100 meg fiber to our high school (network core). That way each building gets a dedicated 10 meg run.
Each building has a Cisco layer 3 switch. We run seperate VLANS for each school. We get very good bandwidth and can sustain about 8 megabits of data throughput at each school.
However, the latency sucks. Most applications are fast but we have a database application that makes tons of small requests and it slows down the app something terrible.
Other applications like file transfers, termminal services, web browsing, email, whatever, are very fast.
Ping time on small packets between the Cisco switches at the remote schools and the network core are about 9ms.
Anyone who has had any experience with these particular Adtran units and can offer any help on lowering the latency would be appreciated. |
|
djweis
join:2006-04-02
West Des Moines, IA | There's very little you can do to change the settings on the 238's. Your latency doesn't seem that high for the type of circuit. |
|
rlawsha
join:2008-02-05
| What if the 238's were replaced with something else? The phone company said they are will to try some new equipment. Does Adtran make a different model that would help us? How about a different brand? How much of this is the specific equipment and how much of the problem is related to the nature of DSL? |
|
djweis
join:2006-04-02
West Des Moines, IA | How much latency do you get for a default sized ping packet and how much do you get for a 1k ping packet? We use both those devices and some from Actelis. I am behind a 238 right now and getting 3-4 ms to a server at the far end. |
|
rlawsha
join:2008-02-05 | ping times from layer 3 switches directly connected to the dsl lines: default size packet average is 10ms average, 1000 byte size packet is 12ms average |
|
djweis
join:2006-04-02
West Des Moines, IA | You're probably not going to get much lower than that, how full is the pipe? |
|
rlawsha
join:2008-02-05 | Almost empty |
|
