Re: [asterisk-users] Moving from DSL to T1

[Steve Underwood]

  On 09/14/2010 04:23 AM, Joel Maslak wrote:
> On Mon, Sep 13, 2010 at 1:12 PM, Hans Witvliet  > wrote:
>
> No these are also geo-stationary (same altitude, so same delay),
> commercial and military satelites,
>
>
> Yes, exactly.  Geostationary satellites have been used for telephone 
> for ages (and are still used for remote areas - they have advantages 
> over the disintegrating constellations such as iridium - namely 
> predictability).

When geostationary satellites were the normal thing for intercontinental 
calls, the call was normally satellite one way and cable the other. 
Satellite both ways would have been cheaper, but the total round trip 
latency was go bad, it was hard to hold a proper conversation.
>
> As for consumer (home) grade satellite internet service, it's pretty 
> low quality.  But if you have money, you can have just as good of 
> service as the telcos enjoy for TDM voice over them (even with VoIP).  
> I know several organizations using them (but they are paying more than 
> the $100 or so a month as is typical for a home user - a lot more).

Steve


-- 
_
-- Bandwidth and Colocation Provided by http://www.api-digital.com --
New to Asterisk? Join us for a live introductory webinar every Thurs:
   http://www.asterisk.org/hello

asterisk-users mailing list
To UNSUBSCRIBE or update options visit:
   http://lists.digium.com/mailman/listinfo/asterisk-users

Re: [asterisk-users] Moving from DSL to T1

[Kevin Keane]

-Original Message-
From: asterisk-users-boun...@lists.digium.com 
[mailto:asterisk-users-boun...@lists.digium.com] On Behalf Of Hans Witvliet
Sent: Monday, September 13, 2010 12:13 PM
To: asterisk-users@lists.digium.com
Subject: Re: [asterisk-users] Moving from DSL to T1

On Mon, 2010-09-13 at 00:32 -0700, Kevin Keane wrote:

> 
> > Latency also is the reason VoIP does not work at all over satellite 
> > connections even though they tend to have plenty of bandwidth.
> Please define "does not work at all over satellite" ???
> Sure, it is not studio HIFI quality, but is th same quality as you get from 
> official commercial telco providers.
> We still have voip over S-band and X-band satelites running NOW between NL 
> and afghanistan. All the people are more than satisfied.
> 
> **
> Should have been more specific. I was talking about Internet over satellite 
> in the USA. I believe those are geostationary TV satellites. I am not 
> familiar with S-band and X-band, but assume they are in lower orbit. That 
> would explain how it can work for you.
> 

No these are also geo-stationary (same altitude, so same delay), commercial and 
military satelites, 

**
In that case, my guess is that they have a dedicated channel for the voice, 
maybe even some kind of clocking mechanism. Some T-1 lines here in the USA also 
have that (one more reason why T-1 works better than DSL/Cable for VoIP). The 
consumer internet satellite services just mix all kind of Internet traffic, so 
one packet may have a very low latency while the next one may have a much 
higher latency, or get lost altogether.

Another thing about the consumer satellites is that they are probably optimized 
for TCP rather than UDP. For TCP, they are using huge retransmission window 
sizes. That allows large chunks of data to arrive without waiting for 
confirmation, and the satellite can organize the data into a stream. With UDP, 
each packet basically stands on its own. Just a guess about another area where 
these two could be different.


-- 
_
-- Bandwidth and Colocation Provided by http://www.api-digital.com --
New to Asterisk? Join us for a live introductory webinar every Thurs:
   http://www.asterisk.org/hello

asterisk-users mailing list
To UNSUBSCRIBE or update options visit:
   http://lists.digium.com/mailman/listinfo/asterisk-users

Re: [asterisk-users] Moving from DSL to T1

[Joel Maslak]

On Mon, Sep 13, 2010 at 1:12 PM, Hans Witvliet  wrote:


> No these are also geo-stationary (same altitude, so same delay),
> commercial and military satelites,
>

Yes, exactly.  Geostationary satellites have been used for telephone for
ages (and are still used for remote areas - they have advantages over the
disintegrating constellations such as iridium - namely predictability).

As for consumer (home) grade satellite internet service, it's pretty low
quality.  But if you have money, you can have just as good of service as the
telcos enjoy for TDM voice over them (even with VoIP).  I know several
organizations using them (but they are paying more than the $100 or so a
month as is typical for a home user - a lot more).
-- 
_
-- Bandwidth and Colocation Provided by http://www.api-digital.com --
New to Asterisk? Join us for a live introductory webinar every Thurs:
   http://www.asterisk.org/hello

asterisk-users mailing list
To UNSUBSCRIBE or update options visit:
   http://lists.digium.com/mailman/listinfo/asterisk-users

Re: [asterisk-users] Moving from DSL to T1

[Hans Witvliet]

On Mon, 2010-09-13 at 00:32 -0700, Kevin Keane wrote:

> 
> > Latency also is the reason VoIP does not work at all over satellite 
> > connections even though they tend to have plenty of bandwidth.
> Please define "does not work at all over satellite" ???
> Sure, it is not studio HIFI quality, but is th same quality as you get from 
> official commercial telco providers.
> We still have voip over S-band and X-band satelites running NOW between NL 
> and afghanistan. All the people are more than satisfied.
> 
> **
> Should have been more specific. I was talking about Internet over satellite 
> in the USA. I believe those are geostationary TV satellites. I am not 
> familiar with S-band and X-band, but assume they are in lower orbit. That 
> would explain how it can work for you.
> 

No these are also geo-stationary (same altitude, so same delay),
commercial and military satelites, 

-- 
_
-- Bandwidth and Colocation Provided by http://www.api-digital.com --
New to Asterisk? Join us for a live introductory webinar every Thurs:
   http://www.asterisk.org/hello

asterisk-users mailing list
To UNSUBSCRIBE or update options visit:
   http://lists.digium.com/mailman/listinfo/asterisk-users

Re: [asterisk-users] Moving from DSL to T1

[Joel Maslak]

On Mon, Sep 13, 2010 at 1:32 AM, Kevin Keane wrote:

My numbers are from an AT&T DSL line in California, suburban San Diego
> county, and just around the corner from the central office. So it is not the
> distance (with DSL, the distance does make quite a difference). On the other
> hand, there are several hops just to get to the Internet backbone.
>

Lots of misconceptions in this thread.  I'll limit this discussion to what I
know - ADSL, T1, and cable as delivered by US telcos/ISPs.

I just measured my Denver, CO Qwest DSL line.  I have a short DSL line -
about 4 city blocks, but then, like most metro areas served by Qwest, once
my connection ends up in the exchange, I'm backhauled about 30 miles via ATM
to the actual edge router(s) that serve the metro area (the edge router is
not in the central office).:

10 packets transmitted, 10 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 28.646/31.359/33.828/1.603 ms

This is pretty typical of Qwest DSL in Colorado and Wyoming.  I've literally
run hundreds of DSL sites in these states, and find that the DSL product is
a great bargain for business (I usually didn't run it to Qwest's edge router
but to my own corporate routers, as basically an ATM circuit that just
happens to be delivered on DSL).  I ran a large video conferencing network
on it without any issues (H323).

The reason for the times being around 30 ms round trip is that Qwest uses
interleaving on the DSL circuit.  It's on for a reason (it makes TCP streams
faster - instead of retransmitting whole 1500 byte TCP packets, the system
retransmits the 53 byte ATM cell instead. It might have to do that several
times, for several packets that get corrupted, but it will still be faster
than TCP dealing with the loss.  Of course VoIP doesn't use TCP, nor does it
need 100% guaranteed packet delivery.  But this also can help with jitter,
depending on what else is on the line.  Typical T1s do not do this
interleaving (they are better engineered, regardless of whether they are
delivered on true T1 media or backhauled via HDSL - either way, the packets
make it out the other end a lot more reliably than they do on ADSL
connections).

For DSL, there are no shared connections between the telephone exchange and
the home - everything there is dedicated.  Cable shares a connection with
your neighbors.  T1 is dedicated to the Exchange as well (burstable or
dedicated bandwidth both).

At the Exchange, DSL is aggregated on a large (OC3 typically) ATM circuit to
get transported to the ISP (or telco's own) edge router.  This is shared
bandwidth with everyone else on the same DSLAM.  A point-to-point T1 has
dedicated bandwidth (no aggregation) to the ISP.  A frame relay, MPLS, or
ATM T1 has the amount of dedicated bandwidth you pay for (in my experience,
usually none, as that's cheapest) with the rest of the bandwidth provided if
there is capacity on that ATM circuit between the central office and the
ISP/telco edge router.  Cable is also usually aggregated at some
intermediate point, similar to DSL.  Once connected to the ISP edge router,
all circuits are aggregated out to the internet backbone via a connection
smaller than the sum of all the subscriber bandwidths.

So, frame relay, MPLS, and ATM T1s - as typically ordered - often function
like DSL, with the same choke points.  Even a point-to-point T1 that goes
"to the internet" however will hit a choke point and might have packet loss
- no matter how much you paid for the T1 (the internet backbone itself has
packet loss and choke points).

Cable has an additional choke point (subscriber loop).

Now, hopefully the ISP and telco have engineered everything to not have
significant choke points and you'll never have a capacity problem (the same
goes with their peering connections - hopefully they, too, are big enough).
But even an MPLS burstable T1 could perform badly at high capacity times.

Most of these choke points (such as the DSL DSLAM to edge router) do know to
not let one user monopolize the uplink, but to let each user have the same
approximate capacity when there is congestion.  So someone with say only one
VoIP call won't experience packet loss or changes, while another user
downloading a movie will see a slower download.  (in the IP world, this is
called "fair queuing" - in the ATM world, it goes by other names; they idea
is that you should give everyone the same amount of possible bandwidth in a
congestion situation, even if they aren't using all of that bandwidth).

Most of these technologies do not let you apply QoS to the choke points
effectively.  So you are left with point-to-point T1s or other T1s that you
buy with guaranteed (more expensive) bandwidth.  But you can't QoS across
the internet.  Sure, you can do some traffic shaping on a DSL line, and
it'll work good most of the time, but there are no guarantees with
guaranteed bandwidth!

So, the only way to gaurantee packet delivery is to build your voice IP
network like you would have buil

Re: [asterisk-users] Moving from DSL to T1

[Kevin Keane]

-Original Message-
From: asterisk-users-boun...@lists.digium.com 
[mailto:asterisk-users-boun...@lists.digium.com] On Behalf Of Hans Witvliet
Sent: Sunday, September 12, 2010 11:52 PM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [asterisk-users] Moving from DSL to T1

On Sun, 2010-09-12 at 15:32 -0700, Kevin Keane wrote:
> In terms of telephony, a T-1 can make a huge difference over DSL. DSL 
> gives you a lot of raw bandwidth, true, but for voice that really 
> doesn't matter all that much. Voice calls only take a relatively small 
> amount of bandwidth anyway; you can fit dozens of concurrent calls 
> into a DSL or T-1. When used strictly for telephony (non-VoIP), a T-1 
> is designed for 24 concurrent calls, each one takes up 56kbit. For 
> VoIP use, most providers tell you that a phone call takes up about 
> 80kbit/s.
> 
>  
> 
> What really matters is the latency, and T-1 is a huge improvement over 
> DSL in that area. The easiest way to measure latency is the ping time 
> to a server that is "close to you" Internet-wise. A DSL has latencies 
> of between 40ms (if it's extremely good and not too many other people 
> are using it) and 1000ms (if there is a problem somewhere). A good T-1 
> may have latencies as low as 5 ms or so. Also, with a T-1 the 
> bandwidth is guaranteed and bidirectional. With a DSL line, you may 
> get burstable bandwidth - you don't actually have that bandwidth, you 
> just get to compete for excess bandwidth with your neighbors.

You consider 40ms extremely good???
Either your isp or youself must have a considerable number of hops to cross.
At home (cheap abo) i got following transit delays (round trip) national 15 ms 
international 17-35 transatlatic or satelite is above 200ms

At work
national 3-4 ms
international 20-25 ms


(sorry about the weird quoting - Outlook insists on top-posting!)
Wow. I think I have to move to the Netherlands. The European telecom landscape 
is quite a bit different from US, so I'm not completely surprised. The USA no 
longer has the fastest Internet in the world anyway.

My numbers are from an AT&T DSL line in California, suburban San Diego county, 
and just around the corner from the central office. So it is not the distance 
(with DSL, the distance does make quite a difference). On the other hand, there 
are several hops just to get to the Internet backbone.

Your work numbers sound like what I have seen with a T-1 here.

 

> Latency also is the reason VoIP does not work at all over satellite 
> connections even though they tend to have plenty of bandwidth.
Please define "does not work at all over satellite" ???
Sure, it is not studio HIFI quality, but is th same quality as you get from 
official commercial telco providers.
We still have voip over S-band and X-band satelites running NOW between NL and 
afghanistan. All the people are more than satisfied.

**
Should have been more specific. I was talking about Internet over satellite in 
the USA. I believe those are geostationary TV satellites. I am not familiar 
with S-band and X-band, but assume they are in lower orbit. That would explain 
how it can work for you.


--
_
-- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to 
Asterisk? Join us for a live introductory webinar every Thurs:
   http://www.asterisk.org/hello

asterisk-users mailing list
To UNSUBSCRIBE or update options visit:
   http://lists.digium.com/mailman/listinfo/asterisk-users

-- 
_
-- Bandwidth and Colocation Provided by http://www.api-digital.com --
New to Asterisk? Join us for a live introductory webinar every Thurs:
   http://www.asterisk.org/hello

asterisk-users mailing list
To UNSUBSCRIBE or update options visit:
   http://lists.digium.com/mailman/listinfo/asterisk-users

Re: [asterisk-users] Moving from DSL to T1

[Hans Witvliet]

On Sun, 2010-09-12 at 15:32 -0700, Kevin Keane wrote:
> In terms of telephony, a T-1 can make a huge difference over DSL. DSL
> gives you a lot of raw bandwidth, true, but for voice that really
> doesn’t matter all that much. Voice calls only take a relatively small
> amount of bandwidth anyway; you can fit dozens of concurrent calls
> into a DSL or T-1. When used strictly for telephony (non-VoIP), a T-1
> is designed for 24 concurrent calls, each one takes up 56kbit. For
> VoIP use, most providers tell you that a phone call takes up about
> 80kbit/s.
> 
>  
> 
> What really matters is the latency, and T-1 is a huge improvement over
> DSL in that area. The easiest way to measure latency is the ping time
> to a server that is “close to you” Internet-wise. A DSL has latencies
> of between 40ms (if it’s extremely good and not too many other people
> are using it) and 1000ms (if there is a problem somewhere). A good T-1
> may have latencies as low as 5 ms or so. Also, with a T-1 the
> bandwidth is guaranteed and bidirectional. With a DSL line, you may
> get burstable bandwidth – you don’t actually have that bandwidth, you
> just get to compete for excess bandwidth with your neighbors.

You consider 40ms extremely good???
Either your isp or youself must have a considerable number of hops to
cross.
At home (cheap abo) i got following transit delays (round trip)
national 15 ms
international 17-35
transatlatic or satelite is above 200ms

At work
national 3-4 ms
international 20-25 ms

 

> Latency also is the reason VoIP does not work at all over satellite
> connections even though they tend to have plenty of bandwidth.
Please define "does not work at all over satellite" ???
Sure, it is not studio HIFI quality, but is th same quality as you get
from official commercial telco providers.
We still have voip over S-band and X-band satelites running NOW between
NL and afghanistan. All the people are more than satisfied.


> To answer the OP’s question: assuming that you will be using the T-1
> for mixed VoIP and data (the most likely scenario in this case), a T-1
> is really not much different from a DSL line. Both provide you with IP
> connectivity. Just make sure that QoS is set up correctly on your
> router and firewall to give priority to VoIP calls. If you are using
> VoIP and DSL concurrently and your router/firewall supports that
> configuration, you may also need to modify routing tables to make sure
> calls go in and out over the correct link.


Other big advantage of T1 above (commercial end-user grade) DSL lines, is that 
you have a higher upload bandwith
Theyoften sell it as 1Mb up, but most of the time you'll have to be
satisfied with the half. But with strong compression that is still more
than enough.


-- 
_
-- Bandwidth and Colocation Provided by http://www.api-digital.com --
New to Asterisk? Join us for a live introductory webinar every Thurs:
   http://www.asterisk.org/hello

asterisk-users mailing list
To UNSUBSCRIBE or update options visit:
   http://lists.digium.com/mailman/listinfo/asterisk-users

Re: [asterisk-users] Moving from DSL to T1

[Gordon Henderson]

On Sun, 12 Sep 2010, Kevin Keane wrote:

> -Original Message-
> From: asterisk-users-boun...@lists.digium.com 
> [mailto:asterisk-users-boun...@lists.digium.com] On Behalf Of Steve Edwards
> Sent: Sunday, September 12, 2010 5:57 PM
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> Subject: Re: [asterisk-users] Moving from DSL to T1
>
> On Sun, 12 Sep 2010, Kevin Keane wrote:
>
>> What really matters is the latency, and T-1 is a huge improvement over
>> DSL in that area. The easiest way to measure latency is the ping time
>> to a server that is ?close to you? Internet-wise. A DSL has latencies
>> of between 40ms (if it?s extremely good and not too many other people
>> are using it) and 1000ms (if there is a problem somewhere). A good T-1
>> may have latencies as low as 5 ms or so. Also, with a T-1 the
>> bandwidth is guaranteed and bidirectional. With a DSL line, you may
>> get burstable bandwidth ? you don?t actually have that bandwidth, you
>> just get to compete for excess bandwidth with your neighbors.
>
>> You are confusing DSL with cable.
>
> Both, actually. The latency numbers are actual numbers measured at a customer 
> site.

Ouch.

My home/office ADSL connection (8Mb in/832Kb out) - ping to my external 
default route:

   $ ping -q -c10 188.39.1.26
   PING 188.39.1.26 (188.39.1.26) 56(84) bytes of data.

   --- 188.39.1.26 ping statistics ---
   10 packets transmitted, 10 received, 0% packet loss, time 9008ms
   rtt min/avg/max/mdev = 12.913/13.266/13.747/0.286 ms

Ping to one of my hosted servers:

   $ ping -q -c10 unicorn.drogon.net
   PING unicorn.drogon.net (195.10.225.68) 56(84) bytes of data.

   --- unicorn.drogon.net ping statistics ---
   10 packets transmitted, 10 received, 0% packet loss, time 9009ms
   rtt min/avg/max/mdev = 17.801/18.443/19.994/0.610 ms

If 40ms is when it's extremely good, then I'm glad I don't live where you 
are!

(However you're right about leased lines, E1 where I am is typically 
2ms-3ms, but people here are moving to Ethernet based carriers now)

Gordon

-- 
_
-- Bandwidth and Colocation Provided by http://www.api-digital.com --
New to Asterisk? Join us for a live introductory webinar every Thurs:
   http://www.asterisk.org/hello

asterisk-users mailing list
To UNSUBSCRIBE or update options visit:
   http://lists.digium.com/mailman/listinfo/asterisk-users

Re: [asterisk-users] Moving from DSL to T1

[Kevin Keane]

-Original Message-
From: asterisk-users-boun...@lists.digium.com 
[mailto:asterisk-users-boun...@lists.digium.com] On Behalf Of Steve Edwards
Sent: Sunday, September 12, 2010 5:57 PM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [asterisk-users] Moving from DSL to T1

On Sun, 12 Sep 2010, Kevin Keane wrote:

> What really matters is the latency, and T-1 is a huge improvement over 
> DSL in that area. The easiest way to measure latency is the ping time 
> to a server that is “close to you” Internet-wise. A DSL has latencies 
> of between 40ms (if it’s extremely good and not too many other people 
> are using it) and 1000ms (if there is a problem somewhere). A good T-1 
> may have latencies as low as 5 ms or so. Also, with a T-1 the 
> bandwidth is guaranteed and bidirectional. With a DSL line, you may 
> get burstable bandwidth – you don’t actually have that bandwidth, you 
> just get to compete for excess bandwidth with your neighbors.

>You are confusing DSL with cable.

Both, actually. The latency numbers are actual numbers measured at a customer 
site.

The sharing of excess bandwidth also happens with both, just in different 
places.

-- 
_
-- Bandwidth and Colocation Provided by http://www.api-digital.com --
New to Asterisk? Join us for a live introductory webinar every Thurs:
   http://www.asterisk.org/hello

asterisk-users mailing list
To UNSUBSCRIBE or update options visit:
   http://lists.digium.com/mailman/listinfo/asterisk-users

Re: [asterisk-users] Moving from DSL to T1

[Steve Edwards]

On Sun, 12 Sep 2010, Kevin Keane wrote:

What really matters is the latency, and T-1 is a huge improvement over 
DSL in that area. The easiest way to measure latency is the ping time to 
a server that is “close to you” Internet-wise. A DSL has latencies of 
between 40ms (if it’s extremely good and not too many other people are 
using it) and 1000ms (if there is a problem somewhere). A good T-1 may 
have latencies as low as 5 ms or so. Also, with a T-1 the bandwidth is 
guaranteed and bidirectional. With a DSL line, you may get burstable 
bandwidth – you don’t actually have that bandwidth, you just get to 
compete for excess bandwidth with your neighbors.


You are confusing DSL with cable.

--
Thanks in advance,
-
Steve Edwards   sedwa...@sedwards.com  Voice: +1-760-468-3867 PST
Newline  Fax: +1-760-731-3000-- 
_
-- Bandwidth and Colocation Provided by http://www.api-digital.com --
New to Asterisk? Join us for a live introductory webinar every Thurs:
   http://www.asterisk.org/hello

asterisk-users mailing list
To UNSUBSCRIBE or update options visit:
   http://lists.digium.com/mailman/listinfo/asterisk-users

Re: [asterisk-users] Moving from DSL to T1

[Kevin Keane]

In terms of telephony, a T-1 can make a huge difference over DSL. DSL gives you 
a lot of raw bandwidth, true, but for voice that really doesn't matter all that 
much. Voice calls only take a relatively small amount of bandwidth anyway; you 
can fit dozens of concurrent calls into a DSL or T-1. When used strictly for 
telephony (non-VoIP), a T-1 is designed for 24 concurrent calls, each one takes 
up 56kbit. For VoIP use, most providers tell you that a phone call takes up 
about 80kbit/s.

What really matters is the latency, and T-1 is a huge improvement over DSL in 
that area. The easiest way to measure latency is the ping time to a server that 
is "close to you" Internet-wise. A DSL has latencies of between 40ms (if it's 
extremely good and not too many other people are using it) and 1000ms (if there 
is a problem somewhere). A good T-1 may have latencies as low as 5 ms or so. 
Also, with a T-1 the bandwidth is guaranteed and bidirectional. With a DSL 
line, you may get burstable bandwidth - you don't actually have that bandwidth, 
you just get to compete for excess bandwidth with your neighbors.

Latency also is the reason VoIP does not work at all over satellite connections 
even though they tend to have plenty of bandwidth.

To answer the OP's question: assuming that you will be using the T-1 for mixed 
VoIP and data (the most likely scenario in this case), a T-1 is really not much 
different from a DSL line. Both provide you with IP connectivity. Just make 
sure that QoS is set up correctly on your router and firewall to give priority 
to VoIP calls. If you are using VoIP and DSL concurrently and your 
router/firewall supports that configuration, you may also need to modify 
routing tables to make sure calls go in and out over the correct link.

From: asterisk-users-boun...@lists.digium.com 
[mailto:asterisk-users-boun...@lists.digium.com] On Behalf Of jon pounder
Sent: Sunday, September 12, 2010 12:07 PM
To: asterisk-users@lists.digium.com
Subject: Re: [asterisk-users] Moving from DSL to T1

On 09/12/2010 02:34 PM, Kyle Kienapfel wrote:


Really it depends on what the capabilies of dsl were assuming you are just 
using both dsl and t1 as internet connections.

a dsl that has close to 1mb/sec out and 10mb/sec or so in, is going to be 
pretty comparable to a t1 actually so not really sure why you would make that 
switch in the first place.

as long as there is a static ip for the server on either, you wouldn't see much 
difference. (t1 is actually usually delivered over hdsl which is basically the 
same thing as adsl except the bandwidth is more symetric.)

if you have a low speed dsl, such as like 128kb/sec up and 512 down you'll see 
much faster performance, but again not much big diff if both are just internet 
connections.

This is also assuming your carrier doesn't particularly grossly oversell either 
service. You need to make sure you are getting transit, not burstable, or 
quality may suffer depending on how its oversold.




On Sun, Sep 12, 2010 at 10:43 AM, Richard Stuppi 
mailto:rich...@stuppi.com>> wrote:
I work in a small office and have fallen into the role of network support based 
on knowing enough about networking to be dangerous.

Our office is moving from DSL to a T1.  Were using Asterisk as our PBX and I'm 
looking for hints or resources that might help me make the transition as error 
free as possible.

Are there well known gotchas that I shoud be aware of?

Thanks in advance,

Richard Stuppi
rich...@stuppi.com<mailto:rich...@stuppi.com>
626-221-8010


You should be more specific,
A)Are you switching from voip over DSL to voip over T1
B) ... or using the T1 for phones?
C)Are you switching from analog lines + DSL to just a T1 for voice and data?

-- 
_
-- Bandwidth and Colocation Provided by http://www.api-digital.com --
New to Asterisk? Join us for a live introductory webinar every Thurs:
   http://www.asterisk.org/hello

asterisk-users mailing list
To UNSUBSCRIBE or update options visit:
   http://lists.digium.com/mailman/listinfo/asterisk-users

Re: [asterisk-users] Moving from DSL to T1

[jon pounder]

On 09/12/2010 02:34 PM, Kyle Kienapfel wrote:


Really it depends on what the capabilies of dsl were assuming you are 
just using both dsl and t1 as internet connections.


a dsl that has close to 1mb/sec out and 10mb/sec or so in, is going to 
be pretty comparable to a t1 actually so not really sure why you would 
make that switch in the first place.


as long as there is a static ip for the server on either, you wouldn't 
see much difference. (t1 is actually usually delivered over hdsl which 
is basically the same thing as adsl except the bandwidth is more symetric.)


if you have a low speed dsl, such as like 128kb/sec up and 512 down 
you'll see much faster performance, but again not much big diff if both 
are just internet connections.


This is also assuming your carrier doesn't particularly grossly oversell 
either service. You need to make sure you are getting transit, not 
burstable, or quality may suffer depending on how its oversold.






On Sun, Sep 12, 2010 at 10:43 AM, Richard Stuppi > wrote:


I work in a small office and have fallen into the role of network
support based on knowing enough about networking to be dangerous.

Our office is moving from DSL to a T1.  Were using Asterisk as our
PBX and I'm looking for hints or resources that might help me make
the transition as error free as possible.

Are there well known gotchas that I shoud be aware of?

Thanks in advance,

Richard Stuppi
rich...@stuppi.com 
626-221-8010



You should be more specific,
A)Are you switching from voip over DSL to voip over T1
B) ... or using the T1 for phones?
C)Are you switching from analog lines + DSL to just a T1 for voice and 
data?


-- 
_
-- Bandwidth and Colocation Provided by http://www.api-digital.com --
New to Asterisk? Join us for a live introductory webinar every Thurs:
   http://www.asterisk.org/hello

asterisk-users mailing list
To UNSUBSCRIBE or update options visit:
   http://lists.digium.com/mailman/listinfo/asterisk-users

Re: [asterisk-users] Moving from DSL to T1

[Kyle Kienapfel]

On Sun, Sep 12, 2010 at 10:43 AM, Richard Stuppi  wrote:

> I work in a small office and have fallen into the role of network support
> based on knowing enough about networking to be dangerous.
>
> Our office is moving from DSL to a T1.  Were using Asterisk as our PBX and
> I'm looking for hints or resources that might help me make the transition as
> error free as possible.
>
> Are there well known gotchas that I shoud be aware of?
>
> Thanks in advance,
>
> Richard Stuppi
> rich...@stuppi.com
> 626-221-8010
>
>
>
You should be more specific,
A)Are you switching from voip over DSL to voip over T1
B) ... or using the T1 for phones?
C)Are you switching from analog lines + DSL to just a T1 for voice and data?
-- 
_
-- Bandwidth and Colocation Provided by http://www.api-digital.com --
New to Asterisk? Join us for a live introductory webinar every Thurs:
   http://www.asterisk.org/hello

asterisk-users mailing list
To UNSUBSCRIBE or update options visit:
   http://lists.digium.com/mailman/listinfo/asterisk-users

[asterisk-users] Moving from DSL to T1

[Richard Stuppi]

I work in a small office and have fallen into the role of network support based 
on knowing enough about networking to be dangerous.

Our office is moving from DSL to a T1.  Were using Asterisk as our PBX and I'm 
looking for hints or resources that might help me make the transition as error 
free as possible.

Are there well known gotchas that I shoud be aware of?

Thanks in advance,

Richard Stuppi
rich...@stuppi.com 
626-221-8010




-- 
_
-- Bandwidth and Colocation Provided by http://www.api-digital.com --
New to Asterisk? Join us for a live introductory webinar every Thurs:
   http://www.asterisk.org/hello

asterisk-users mailing list
To UNSUBSCRIBE or update options visit:
   http://lists.digium.com/mailman/listinfo/asterisk-users