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Kaine (IS/IT--Management) (OP)
23 Sep 01 21:57
Is it possible to simulate a WAN between 2 routers.

I have a 1603 and I am wondering if I can connect the BRI to another one using a crossover cable?

I am looking to simulate either ISDN or FRAME

If I was to get another 1603 or anything else could this be done?
jimmyzz (TechnicalUser)
24 Sep 01 0:17

It is possible to simulate Frame Relay between two routers, but you need the correct hardware interfaces on each router, ie. serial interface.  You will require a X.21 DCE and X.21 DTE serial cable connected to each other.

The 1603 does not come standard with a serial interface, but has a ISDN BRI port on board.  You would have to purchase a serial card to go into its expansion slot.  The 1601 router has the serial port on board.

I have not been able to simulate ISDN between two routers using a cable back-to-back.  I think you need some device that simulates the ISDN.  If anyone out there knows of a cheap and easy way to simulate ISDN, I would also like to know the recipe.

writemem (TechnicalUser)
26 Sep 01 13:11
ISDN is very tough to simulate in that you need an isdn switch to generate the ISDN span signals there might be a few boxes that could do it but your gonna pay.  you could check

good luck

trevorh13 (Instructor)
27 Sep 01 11:29
Incidentally you would need to add the clock rate 56000 command to the router functioning as DCE. You can identify which router has the DCE cable connected via the show controllers serial command. Personally I just add the command to both routers as the command only takes effect on the DCE device anyway!
mavos (MIS)
2 Oct 01 10:13
I have just done this in our lab, just be aware that it isn't the exact same as a WAN frame relay connection.  56K clock rate straight through on the DCE to DTE will give quicker response than a 56K FR circuit.  You are not dealing with CIR's or the other congestion you get on a regular circuit.  You can get WAN emulation software you if you need exact test environments.
jeter (TechnicalUser)
3 Oct 01 0:05
If you have an adtran 500 this will simulate the isdn circuits.
J.Fisher CCNA

Kaine (IS/IT--Management) (OP)
3 Oct 01 17:14
What pins do I need to cross over to make the DCE/DTE Cable for the serial cards?

Can I buy these from somewhere or do I need to get it made?

Kaine Sherwood
wybnormal (TechnicalUser)
3 Oct 01 18:00
Pacific Cable


yahoo auction

Should not run anymore then 40 bucks a cable for 6-10 ft.. I paid 32 for my last 4 cables.


Find me at

"Diplomacy; the art of saying 'nice doggie' till you can find a rock" Wynn Catlin

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