There are many cases when terminating a DSLAM with a single T1 makes sense.
You assumed that these were ADSL end users, they may not be. We used this exact model in a previous gig to terminate a bunch of management interfaces on hardware or console servers. There's lots of telemetry type applications where this setup is more than enough to meet the need. Also, the DSLAMs I am familiar with (samsung, redback and nokia) can terminate DS3 or DS1. On Jan 18, 2011, at 4:29 PM, Michael Sokolov wrote: > Nick Voth <[email protected]> wrote: > >> We have a number of channelized DS3's that are terminating on to a 7206VXR >> with the standard old PA-MC-T3 cards. We have a need to deliver ATM based >> DS1's out to Adtran DSLAMs in the field. Customers will connect to the >> Adtran units via ADSL and their local telco loop and their data is then >> aggregated by the Adtran and on to the ATM based T1 coming back to us. > > Let me see if I've understood you correctly: you are planning on feeding > a whole DSLAM with a single T1? In other words, the aggregated bandwidth > usage of all subscribers you are going to serve is going to fit into a > single 1.5 Mbps T1? I thought today's spoiled ADSL users demand a heck > of a lot more than that... (The latter thought is based on my personal > experience of the level of ridicule I get for promoting my beloved SDSL > which also maxes out at 1.5 Mbps.) > >> SO, my question is if we can deliver these circuits to the Adtran units >> using the "encapsulation atm-dxi" on each serial interface. I know this >> encapsulation is for delivering ATM through an ATM ADSU, but in this >> application, does the far end Adtran function as the ADSU or are we missing >> something on our end? > > I invite someone from Cisco to prove me wrong, but my understanding is > that "encapsulation atm-dxi" is another term for what's also known as > ATM FUNI: > > http://ifctfvax.Harhan.ORG/OpenWAN/l2conv.html > > With ATM FUNI aka DXI the line carries HDLC frames which have the AAL5 > packets encapsulated in them, so the hardware is still HDLC. True ATM > over DS1, OTOH, would mean running actual 53-octet ATM cells over the > DS1 bits, which calls for significantly different hardware. I would > expect that a DS1 feeding a DSLAM would need to be true ATM, but I'm not > familiar with Adtran DSLAMs specifically. > > (The DSLAMs which I do know want to be fed with DS3 or higher, not DS1, > and they do want ATM cells over that DS3, not FUNI or DXI.) > > HTH, > MS > _______________________________________________ > cisco-nsp mailing list [email protected] > https://puck.nether.net/mailman/listinfo/cisco-nsp > archive at http://puck.nether.net/pipermail/cisco-nsp/ _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
