Conference noted::decnis

    Can anyone assist...please help.
    
    John Malott

    Mark,
    
    First of all, Thank you for your help.
    
    Second,
    
    We have a large Global network, made up of mostly (vast majority) 
    Decnis'.  Much of the design here is of the 'one central site Frame 
    connection to many smaller sites Frame'.  The central site having a 
    large Access port and each small site having smaller access port(s).
    
    Many of these small sites have 'redundant' Frame PVC's to different
    routers at the Central site.  One PVC serving as a primary, and the 
    other as a backup.  Our customer wishes to employee an ISDN dialout
    backup for these circuits.  I see several problems with their design
    and fitting dialout backup into the scheme.  
    
    1.  Obviously, dialing the ISDN backup if only one of the Frame 
    circuits is still active is a costly idea.  Thus, I am looking to 
    implement ISDN dialout ONLY when BOTH Frame circuits are down.
    Also, 'Chaining' circuits does not appear to be a good solution
    either, since the first secondary would need to be 'down' until
    needed.  Therefore, the customer would be paying for a Frame 
    circuit that wasn't active.  If they are paying for the service
    it is best to have the adjacency already there and ready for use.
    
    2.  As you have questioned as well, 'can we do backup circuits on
    Frame PPP links'.  This is another question I have.
    The manual (ver 3.1 Decnis mgmt) indicates PPP are OK, but nothing 
    about Frame.  However, as I have stated, I only wish to utilize the
    dialout backup, if both PVC's are down (in some cases one PVC on
    sites that only have one).  I do not wish to use the Frame as backup,
    only primary, therefore, I would think it would not be an issue, since
    I won't be dealing with the Frame modem connection etc, as with the 
    backup circuit (ie disable Modem connect line and routing circuit).
    
    3.  I think you have answered one of my questions partially, that being 
    the multiple primary question.  I guess I could have more than one
    group
    and point each one to the same secondary.  But, I wanted to have a 
    secondary at each side (small site and central site).  The small site
    would initiate the call (ISDN TA) by raising DTR to its TA and the 
    adapter handles the dialout.  The Central site would have a group
    for each small site (as you suggested).  DTR would be raised at the 
    Central sitedue to loss of adjacency to small site and the port to the
    TA would then simply be enabled.  My idea here is to not have an
    enabled
    circuit sitting there all the time trying to come up.  However, I am 
    limited to 1 port (at central site) for a 'group' of small sites.
    Thus, if more than one adjacency is lost then only one could get in.
    Would this cause any internal problems with the Central site Decnis
    by trying to raise DTR to enable a secondary circuit if it is already
    in use (due to a competing small site already grabbing it)?  And, 
    once a secondary circuit is enabled, how long will it remain enabled 
    even if adjacency is notcreated right away?
    
    Am I limited to having an HDLC type circuit always enabled at the 
    Central site for use by small sites if their Frame fails and dialout is
    required.  In this case, no backup circuits would be needed at the 
    Central site.
    
    Thank you in advance for your efforts...
    
    Best Regards,
    
    John Malott
    NSIS