Re: Dynmically Throttling a T-1 with an IRX (fwd)

Jeff Thomas (jeff@webnexus.com)
Mon, 2 Dec 1996 19:16:30 -0800 (PST)

MegaZone wrote:
>
> Once upon a time Mike Jipping shaped the electrons to say...
> >We've considered several ways to do this. One is to play with the
> >settings on the IRX-114 router the client is connected to (e.g., "set
> >speed s1 ..."). We've also considered writing some custom applications
>
> Not possible - the speed setting is meaningless. It is just a note for
> human operators, the line speed is determined by the clock.
>
> You MUST match the clock the telco is using or sync lines don't work.
>
> If you change the clock on the router (not possible with Livignston) or
> the CSU/DSU and it doesn't match the telco - the channel is dead.

IF this is a dedicated T1 (not frame-relay) AND you can control both
CSU's remotely AND you can make changes to them that take effect after
some delay period you should be able to change the channel assignments
to allocate fewer or more channels. The trick is that they have to be
in sync, so if you modify one and the changes take effect before your
changes to the other, the line will be down.

This all assumes that you're taking clock from the telco. If one end
is generating the clock then the equation might change a bit.

If you're going to do something like this it would probably be good to
give yourself a backdoor in (through an analog line perhaps) just in
case you screw up.

-Jeff

-- 
Jeff Thomas
WebNexus Communications                http://www.webnexus.com/
jeff@webnexus.com                      http://www.jeff.com/