On Sun, Feb 21, 2021 at 02:51:51PM +0000, David Adams JR wrote: > Is this a place to ask or get help on a Juniper router issue? > > I am trying to learn and then pass Juniper certification(s) and bout a J2320 > router with a serial card. Even though it appears serial connections are no > longer used and people have said I am wasting my time trying to make a serial > connection between the Juniper serial card and another Juniper J2320 serial > card (I really want to make it to a Cisco 1821 router serial card), I have > been trying to to find out how to successfully do so.
Sure, everybody has to start learning somewhere. We all started at the basics. First off, what PIMs do you have inside your J2320 router? Not sure what a Cisco 1821 is, do you mean 1812? Or an 1841? Or a 1921? What WIC cards do you have for your Cisco router? Second, there are two types of serial connections. Synchronous and Asynchronous. Typically, for WAN communication, it is all synchronous communication, which is _not_ what you'll find on your PC back when PCs had serial ports. (those were all asynchronous). While it is possible to setup PPP over async serial, it is rather a pain to get get it all working, and interoping with things. These routers were not generally designed to do that. Typically these classes of routers were setup to do T1 PTP or Frame-Relay network communication. I'm not sure if it would be really worthwhile to setup a router with sync serial communication any longer, I'd probably recommend just doing it all with ethernet ports for a home learning lab, which is most likely what you'll find that the work field is doing now, unless you are going in supporting some older legacy telco support position. But, if you are looking to do sync serial ports, I'd make sure you had something like a dual port T1 PIM card in your Juniper router, and a WIC-1DSU-T1-V2 card in your 1841 (assuming that is it), and connect them up back to back with a cross-over T1 cable https://www.freeccnaworkbook.com/blog/ccna/how-to-make-a-t1-crossover You can get things like cross-over v.35 or cross-over smart-serial cables for the sync serial cards (ie. without the built-in T1 CSU/DSU) in these routers, but they are getting rare (only used for test labs), and probably pricey. Using T1 cards is probably much much more learner friendly if you want to do sync serial connections, and more like what was in use back then. Finally, some of these older low-end SOHO routers were really slow (booting, throughput, etc) Ie. the routers were talking about here generally can do maybe 6-8Mbps of throughput. Emulation of routers in GNS3 probably would get you a lot more bang for the buck. But yeah, I get the desire to actually touch hardware too (not that I get to actually see the hardware any more). _______________________________________________ juniper-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/juniper-nsp
