Conference irocz::common_brouters

905.0. "Routeabout with E1 Speed" by HGOM11::HUMPHREYTAN () Mon May 19 1997 11:44

    Hi,
    
    I have some question about the Routeabout router. 
    
    I have one Routeabout central and one Routeabout Access 90 EW and
    connect them via two back-to-back ASM-40-1 Converter. One of the
    ASM-40-1's clock is set to internal and the other to received. Now the
    trouble arise.
    
    When I use E1 speed, I find they may lose packet. As time goes the
    percent of lost packet increased. After about 150 packets transmitted,
    the transmitter can not receive a packet at all.
    
    Then I decrease the speed to 1.024M and repeat the same lab, I get the
    same result.
    
    When I decrease the speed to 512K, everything seems OK. They no longer
    lose any packets. Why?
    
    I repeat the lab time and time and I get the same result.
    
    I replace the two routers with DECbrouters, with CISCO 2501 routers,
    all of them can work well on E1 speed.
    
    I have read some notes about the similar troubles. I have no reason to
    use FCD-2 instead of ASM-40. First, FCD-2 is more expensive than
    ASM-40. Second, the data speed of FCD-2 is 1.984M, not 2.048M.Third,
    I have total 3 project where we sold same solution and meet the same
    trouble. I can not explain to my customer why these happen.
    
    Any comment is appreciated,
    
    Humphrey
    
     
    
     

    Which cable type (V.35, etc) are you using?
    
    Note 657 says the same problem affects DECbrouter 90 (and several notes
    in KALI::DEWBR say the same thing).  How did you get BRUT to work?
    
    I guess I would suggest that if you feel very strongly about it, you
    should raise an IPMT case to see that the proper people get involved.
    
    Tim

    By the way, it's quite amusing to do an AltaVista Notes search on "rad
    asm-40".  It appears almost anything we've ever built with a serial
    interface has had trouble with this box!
    
    Tim