woe is me.

[ciscodaze]

Hey, im just throwing this out to reduce my general lack of understanding of this side of the stuff I'm supposed to know. Any comments would be illuminating to me Im sure.

Since Ive been building my first lab (with 2621's), I've been pondering the mysteries of the WIC-T2. Aside from making back to back connections I don't really have a grasp on these and how they were used in the real world. The highest clock rate that I can set on the ones I have is 4000000 bits...which equals .47 MB according to my calculator. Which, being 1/3 as fast as a T1, pretty much makes them legacy connectors right?

So in the hayday of these particular 2621 routers, a serial wan would have looked something like this, as far as understand it.


R1 ----CSU/DSU--------------/ various(?) wan types, e.g. T1, T3, DSL, BRI /-----------------CSU/DSU -----R2

there could be various types of standards between those CSU/DSU’s right?

I know that CSU/DSU is for the most part integrated right into the routers now, like the T1-CSU/DSU, or DSL. Is using a serial cable to connect to an external CSU/DSU a thing of the past now? Are serial ports like the WIC-2T still being used, and what would be a typical use in a production environment?

And where the heck can I go to learn about this stuff? I just need a good basic foundation on serial connections (what are they good for) , wan interface types, whats being used today, etc...

Cisco taught me how to configure PPP and hdlc on a serial connection, how to set the clock rate, and what a DCE/DTE cable is and how to hook it up...then they left me twisting in the wind like a fool...

anyone heard of any books that deal with this kind of stuff specifically?

Thanks,

[Big Evil]

I just finished pulling the last serial link in our whole customer network to replace with ethernet. You would need to be looking down some service provider root to get this kind of information - i cannot think of any books off the top of my head.

[ciscodaze]

I just finished pulling the last serial link in our whole customer network to replace with ethernet. You would need to be looking down some service provider root to get this kind of information - i cannot think of any books off the top of my head.

Thanks BE...i go through these phases of frustration with things that I dont understand well, and have no way of finding out about, short of begging. I do not work in a real network environment, so I get very little chance to see any real world configurations - meaning layer one.

[Big Evil]

Even at a T2 ISP i do not see the whole picture. I see the CE and the PE (also the P) they are all mine, but not how the T1 pulls that from the customer to us. I know the route it takes and but how they set their side up is not told.

Have peep at this i found

http://docs.google.com/viewer?a=v&q=cache:9jWfb-1G5g4J:www.btinterconnect.com/llunbundle/wes/WES_Handbook_draft5d%252080306.doc+bt+wes+link&hl=en&gl=uk&pid=bl&srcid=ADGEESiwiX9dW5ScNuBV0ymI4_rCgpHWoHEKO7r0HiEI mCBho88dDfMQqPt5dceiJmDzY1lO53frGt5kc7OOsuOYmXised e9vDeNCKLMlduoUBU1LHOHD1CnKnF23XxUepreZVjPiHnW&sig=AHIEtbRfRxXnUhcsWnLl1dNFnkzVSTWC0w