VDSL CPE Mixed Results

Andrew Carey carey at ar-ballbat.org
Thu Jan 15 15:04:34 UTC 2015

Also, what do your stats look like? 6kft is getting beyond the sweet spot for VDSL2, particularly if you're trying to push 10Mbps on the upstream. 

Sent from my iPhone
> On Jan 15, 2015, at 5:36, Shawn L <shawnl at up.net> wrote:
> I was going to ask if you've tested the cable pair at all.  If the pair is
> bad, or even a little out of balance, bad scotch loks, etc. VDSL isn't
> going to work properly.
> We have customers that are definitely in-range for VDSL but who cannot get
> it because there is a 26 gauge insert between two cross-connect cabinets in
> the field
>> On Thu, Jan 15, 2015 at 8:15 AM, Scott Helms <khelms at zcorum.com> wrote:
>> I'm going to guess you're a CLEC from your website and a common problem
>> I've seen in that scenario is that vectoring doesn't work between DSLAMs
>> because it needs all pairs to be part of the vector group so that the DSLAM
>> can mitigate FEXT.  DSLAM vendors have been working on system level, rather
>> than DSLAM/binder level, vectoring for a while but cross vendor support is
>> questionable at best.
>> Read the section on system level vectoring especially:
>> http://www.adtran.com/web/fileDownload/doc/32362
>> If you are sharing binders with the ILEC and potentially other CLECs then
>> you really need to talk to you ILEC rep and find out what they're doing for
>> system level vectoring to see if there is an option for your DSLAMs to be
>> included.  That benefits everyone and will _greatly_ increase performance.
>> VDSL2 speeds will otherwise be unreachable unless the ILEC gives each CLEC
>> their own binder, not very practical.
>> Scott Helms
>> Vice President of Technology
>> ZCorum
>> (678) 507-5000
>> --------------------------------
>> http://twitter.com/kscotthelms
>> --------------------------------
>> On Wed, Jan 14, 2015 at 9:29 AM, Stetson Blake <
>> Stetson.Blake at datayardworks.com> wrote:
>>> Hey All,
>>> We have been deploying Adtran 838(shdsl) and 868(dsl) units in our metro
>>> area with mixed results. The devices themselves are reliable and secure
>>> it would seem, but the speeds were are able to get are not. ie. we have
>>> deployed 'vdsl' and needed 3 lines to get up to 10x10 speeds. We are
>>> using an Adtran TA5000 on the other end to terminate our connections.
>>> The distance between the site and CO is not great (under 6k feet). What
>>> gives? Are we provisioning wrong, using the wrong equipment, or a
>>> combination of both?
>>> If we were able to get the speeds others have been reporting from VDSL,
>>> life would be great.
>>> Anyone feel free to contact me off-list or on, this has had me
>>> scratching my head for a while now.
>>> Thanks,
>>> --
>>> Stetson Blake
>>> Network Technician
>>> DataYard
>>> 130 West Second St.
>>> Suite 250
>>> Dayton, OH 45402
>>> http://datayardworks.com

More information about the NANOG mailing list