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  • 1.  connecting J-series to cisco frame relay switch

    Posted 10-27-2009 13:05

    Hi,

     

    We are trying to connect several j-series 2350 to a FR cloud with the use of the following cables:

     

    *juniper DTE-DCE RS-232

    *cisco DTE-DCE DB-60

     

    the Cisco cable is working fine B-toB on the FR switch but we missing some modem signals as follows:

     

    FR serial 1/0  - >juniper DCE-DTE RS-232 <- juniper serial se-1/0/0

     

    Cisco:Serial1/0 is down, line protocol is down
    DCD=down  DSR=down  DTR=down  RTS=down  CTS=down

    Juniper: Physical interface: se-1/0/0, Enabled, Physical link is Down
    Control signals:
         Local mode: DTE
         To DCE: DTR: up, RTS: up
         From DCE: CTS: down, DCD: down, DSR: down

     

    FR serial 1/2  - >cisco db-60 DCE-DTE  <- juniper serial se-1/0/0

     

    Cisco: Serial1/2 is down, line protocol is down
     DCD=up  DSR=up  DTR=down  RTS=down  CTS=up

    Juniper:Physical interface: se-1/0/0, Enabled, Physical link is Down
       Control signals:
         Local mode: DCE      <---  strange DTE is on Juniper side and it is reporting DCE ???

         To DTE: CTS: down, DCD: down, DSR: up
         From DTE: DTR: down, RTS: down

     

     

    The question is now what is a good cable to connect a cisco serial to a juniper J-series serial ? Or what is the correct pin layout for it the become active? Or can you activate with CLI commands on the Juniper router the missing/missed serial modem signals other than 'ignore-all"  ?

     

     

    Thanks in advance,

     

    Mickey.


    #Juniper
    #cisco
    #serial


  • 2.  RE: connecting J-series to cisco frame relay switch

    Posted 10-29-2009 04:25

    I assume you are trying to connect Cisco _ROUTER_ acting as FR switch to a J2350 router, is that correct?

    In that case:

    1/ have you connected RS232 DCE cable end to Cisco router and RS232 DTE cable end to J2350?

    2/ have you configured "clock-rate" on Cisco Serial interface to act as DCE?

    Rgds

    Alex



  • 3.  RE: connecting J-series to cisco frame relay switch

    Posted 10-29-2009 05:00
    Hi, "/ have you connected RS232 DCE cable end to Cisco router and RS232 DTE cable end to J2350? " ->that is correct, the DCE site , is also the side where the clock is provided . even configured with PPP / cisco HDLC we still missing modem signals (DCD, etc), Juniper cable works well with Juniper back-2-back, cisco cable works well with cisco back-2-back . But Cisco to juniper with either cisco cale or juniper cable won't work at all. I'm now in the state of connection breakout box the the rs-232 to find out where the mixup is in the cable.


  • 4.  RE: connecting J-series to cisco frame relay switch
    Best Answer

    Posted 11-15-2009 23:53

    The Solution is simple ,

    just use on the Cisco side a Cisco cable (eg rs232-DCE) and use on the Juniper side a Juniper cable (rs232-DTE)

    that will work, apparently DB-60 pin layout can be vendor specific.


    #cisco
    #Juniper
    #cabeling
    #serial