2 Replies Latest reply on Apr 13, 2015 3:39 PM by bcase

    Atlas 830 as Frame Relay Switch & Cisco

    bcase New Member

      Having trouble getting my Atlas 830 setup to act as a frame-relay switch.  Have an 830 with 4 Quad T1/PRI modules.  Attempting to setup a simple FR switch between 2 T1 ports and 2 Cisco routers.  No matter what settings I change, best I can get is Layer 1 up but Layer 2 down (from the cisco side) - the adtran always shows the circuit as down.   I followed the basic setup in the Cisco Academy Guide with the major difference that I'm using T1 ports rather than V.35 interfaces (which should be irrelevant).  This seems a protocol problem more than anything else.


      I've created the Packet Endpoints, setup the signaling, created the DLCI's on the sublinks, created the Packet Connections and mapped them with the Dedicated Maps.  Anything I'm missing here?


      Network clock - since there is no "carrier" to provide clock, is the internal clock good enough?  The routers are currently providing clock to the line, but either way has made no difference.


      Sublink DCLI's - The guide isn't really clear, but I'm assuming when I map a sublink on a port (say slot 1, port 1) the device I'm connecting to should have the same DLCI configured on it.  correct?


      While I'm making an assumption, I'll ask the question - Can the T1/PRI ports be used in this manner?  Or does this type of setup require the older V.35 interfaces.


      Also the status bar at the bottom shows "1:ERR" while 2,3 & 4 show ONLINE - the module menu shows the module as online with no errors so again, I'm assuming this is pointing to the fact I have mappings that are not active correct?


      Attached is some screenshots of my configuration. 




      Thanks for any help!



        • Re: Atlas 830 as Frame Relay Switch & Cisco
          patrick Employee

          Thank you for using the ADTRAN Support Forums community.


          First off, you definitely can use the T1 module and its interfaces for a Frame Relay connection.

          As for timing, if the routers are providing timing, then the ATLAS should take timing from one router or the other (Slot 1.1 or Slot 1.2).

          Your assumption is correct: you are mapping the Frame Relay endpoint to a physical interface, so the router connecting to that physical interface should have the same DLCI as you have configured on the mapped FR endpoint.

          In your screen shot, I see you only have DS0 #24 mapped and not all 24 channels. I assume you want all 24 channels. To do this you must type in "1-24" otherwise you are only selecting the specific DS0 (like #24). This is probably why the Layer 2 is not coming up.


          The "1:ERR" indicates that at least one port that is configured (mapped) on slot 1 is taking errors.


          Hope this helps,

            • Re: Atlas 830 as Frame Relay Switch & Cisco
              bcase New Member

              You sir are awesome!  Selecting the DSO's range was exactly the issue.  Also figured out the "1:ERR" was a clocking problem.  Once the circuits came up the error went away but still showed clock slips - figured out that only one router needs to provide clocking and the other(s) can get clock from the other T1's across the Adtran.  Very nice     Would be better if the Adtran could get clock from NTP, but oh well.