🚀 go-pugleaf

Jeffrey D. LaCoursiere (lacoursj@dudemon.fastlane.net) wrote:
: 
: I have some insight here, as we have been benchmarking several models
: of ISDN equipment for the past few weeks.  Of the four units we are looking
: at (Bay Remote Annex 6300, Ascend Max400x and TNT, USR Total Control Hub,
: and Cisco (if it ever gets here) 5210), only the Cisco claims to "bond 
: across boxes".  Ascend claims to know about the problem, but chooses not 
: to ship their boxes with this feature as they claim it impacts performance.
: My fuzzy understanding of how it is accomplished involves all the term 
: servers on a segment broadcasting a proprietary protocol that informs the 
: others when the first B channel of an MPPP connection is accepted.  When 
: the second B channel is accepted, the server that accepted it *should* 
: know which server has the first channel, and proceeds to "forward" the 
: packet pieces to the first term server (over what protocol I am not 
: sure... perhaps just tunneled in IP?) for re-assembly.  I would accept 
: that there may be some latency in this process.  Don't forget traffic in 
: the other direction.  The server with the first channel will get the 
: traffic that is bound for the user, and will have to make some decision 
: to split it up and send pieces to the server with the second channel.

Ascends now support MPP accross multiple boxes.
 
: Ascend sales claims that this process impacts performance by 25% .

I wouldn't doubt it as bonding via ethernet is a _bad_ idea.
 
: 1.  Buy a bigger box.  Two of the vendors mentioned above claim that an OC3
: capable server will be available next year.  Thats somewhere in the 700 B 
: channel range, folks.  Might as well become your own local CO :)  This 
: solution is a good one, if the hardware is actually up to it.  It 
: probably scales *fairly* well, until the time (if it comes) that ISP's 
: will have to handle 25,000 simultaneous calls.  Even then, distributing 
: customers across a few tens of these monsters probably wouldn't be 
: extremely difficult.

Assuming that you are provisioning your PRIs without NFAS with 23B + D to
a T1.

That woudl give us :

23 (T1) * 28 == DS3 (T3) == 644 B channels
OC3 is ~ 3 DS3s == 644*3 == 1932 per OC3.

Now your chances of not achieving an MPP connection are slim :-)
 
: Has anyone come up with any other solutions?

Use Ascend's MPPP across multiple boxes. If you are using 4 PRI Ascends,
the chances of having 1 customer on 2 boxes is very slim.

Jonah

-- 
Jonah Barron Yokubaitis    | San Antonio (210) 272-8111
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