04-07-2008 10:59 AM - edited 03-03-2019 09:27 PM
We have a heavy bandwidth application that requires point to point connection with our customers. Right now we are using point to point T1 and when required we bundle the T1s for greater bandwidth.
Based on our carrier the break point on the cost of T3 is 6 T1s which we've alredy surpassed.
So I wanted to know if I order the T3 from the carrier would I be able to channelize it into multiple T1s? If yes what is the minimum router model and module I would need. Can the 3800 series router handle this?
04-07-2008 11:23 AM
04-07-2008 11:50 AM
Absolutely no need for external devices when using channelized T3. You can use as small as a 7200 router with PA-MC-T3 and you're all set.
Hope this helps, please rate post if it does!
04-07-2008 11:54 AM
Small as a 7200! Check the price between the two, there is a huge difference.
04-07-2008 12:06 PM
Beside the fact that7200 with npe-400 can be had very economically on the used market, when you have many T1s possibly with services enabled, even a 3800 router doesn't really do the job, so so migrating to a proper edge-class router is necessary anyway.
Furthermore the cost of a full equipped M13 mux plus the interfaces in the router makes so that having the hardware in the router makes that solution more economical.
04-07-2008 12:17 PM
I disagree. The T3SU will terminate the T3 and split the DS3 into multiple channels with the physical hand off being a HSSI/V.35/DSx. This solution is cheaper for both the T3 end as well as the customer edge (say a 2811 with a HSSI interface).
04-07-2008 12:29 PM
Of course you are entitled to your opinions.
But do the math and check what is better between an octopus cabling for like 20 x T1 to an external device, and a clean, purely router based solution.
Channelized interfaces have been an excellence point for cisco and have always been received positively since introduction more than 10 years ago.
04-07-2008 12:38 PM
Why use and Octal cable when you can use a single HSSI interface? I have not heard of Cisco being able to channelize from a T3 to multiple sub-rate interfaces on the same chassis (HSSI, V.35, IMA, DSx). Provide some docs if you can.
04-07-2008 12:55 PM
I didn't say octal, I said octopus like in the sense of multilegged connection.
Anyway, when using CT3 that remember is alway M13, that is comprised on individual T1s, one common need is to inverse multiplex "some" of these T1sm like in the question that originated this thread. This is perfectly possibly and you have either MLPPP or CEF load balancing without the need of going thru an intermediate speed interface.
In other words, the niceness of all that is having a single interface going into telco and then you reconfigure things as you like better without touching or changing hardware anymore.
If that doesn't appeal to you, as I said before, that's fine with me. But please do not take a challenging attitude toward myself as I don't really need to prove anything to anyone :)
04-08-2008 11:45 AM
If I channelize the T3 into individual T1s would I be able to bundle the some of the T1s using multilink PPP?
04-08-2008 11:47 AM
Yes or you can bundle them into a higher speed interface like HSSI.
04-08-2008 01:06 PM
Yes, but when using an external multiplexor to bundle T1s, a matching unit is needed on the two sides of the circuit. A MLPP or CEF load sharing does requires the router only.
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