Connecting 2 1602R routers

[Slowmo]

Is there a cable to allow me to connect 2 1602R routers via the ISDN ports?

[thisisshanky]

Hi,

Its not possible to connect two ISDN ports back to back, without having an ISDN switch.

[Slowmo]

Actually I found a Cisco tech note that showed me how. Using a rollover cable it works fine. The connection doesn't seem to be the greatest, less than 100 ping response, but it will work for some testing I'm doing. I believe the trick here is that the 1602 may have "switched ports" I am totally unfamiliar with ISDN so I'm just guessing. Anyway it is working.

[thisisshanky]

Can you post the link?

[Slowmo]

http://www.cisco.com/en/US/products/hw/routers/ps233/products_tech_note09186a00800a3f09.shtml

I have not configured the lines as noted, so I expect performance will increase once I do.

[thisisshanky]

The link is for a T1 or 56k crossover cable and not for ISDN. If you have a WIC with internal CSU/ DSU, then u can use the above cross over cable to link two routers back to back. This wont be valid for ISDN.

HTH

[Slowmo]

My mistake I thought the port was labeled as ISDN, it is not, just 56k csu/dsu.

[thisisshanky]

Ok,

You can make a cross over cable as mentioned in the link, to connect both the 56k ports. You can get a crimping tool from Radioshack to crimp the cable.

[Slowmo]

Actually the standard "rollover" cable you use to connect to the console port works great.

[thisisshanky]

Yeah, you can do that only in case of 56k coz pins 1,2 7,8 are crossed, and the polarity doesnt matter.