Yes these end users are ADSL users and in many cases these are very rural connections where a single T1 will suffice. Often we bond several of them with IMA to get better capacity, but higher bandwidth links are unavailable.
Thanks, -Nick Voth > From: Scott Granados <[email protected]> > Date: Tue, 18 Jan 2011 16:45:44 -0800 > To: Michael Sokolov <[email protected]> > Cc: "[email protected]" <[email protected]>, > "[email protected]" <[email protected]> > Subject: Re: [c-nsp] ATM over a Serial Interface question > > 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/
