Adaptive modulation was allowed before Oct 2012 but only for modulations that met the minimum bits/Hz requirements. Oct 2012, the rules were changed to allow lower modulations as long as the two-way availability on the path meets 99.95% at the lowest compliant modulation.
-----Original Message----- From: Af [mailto:[email protected]] On Behalf Of George Skorup Sent: Friday, July 31, 2015 10:57 AM To: [email protected] Subject: Re: [AFMUG] stupid FCC license question Really? How were we coordinating and licensing ACM well before that? On 7/31/2015 7:32 AM, Hardy, Tim wrote: > Licensing adaptive modulation has only been legal (in the US) since Oct 2012, > so the vast majority of licensed paths will be licensed for one fixed > modulation only. > > -----Original Message----- > From: Af [mailto:[email protected]] On Behalf Of George Skorup > Sent: Thursday, July 30, 2015 5:02 PM > To: [email protected] > Subject: Re: [AFMUG] stupid FCC license question > > There are a lot of old telco paths licensed with fixed 30MHz and 128QAM. > They usually have large antennas and lots of Tx power. You'll see their > receive power in the -20's. I guess they don't want fade. :) > > On 7/30/2015 3:54 PM, Adam Moffett wrote: >> I can't imagine why anyone would have licensed this path this way. >> Oh well. >> >> On 7/30/2015 4:11 PM, George Skorup wrote: >>> Yup, fixed. >>> >>> On 7/30/2015 2:57 PM, Adam Moffett wrote: >>>> I'm looking at a path in ULS that only shows one modulation type. >>>> I've seen others in the past that will list several modulations. >>>> >>>> Is this path ONLY allowed to use 16QAM? No ACM permitted? >>>> >>>> 30M0D7W >>>> Baseband Digital Rate (kbps): 132270.0 Digital Modulation Type: >>>> 16QAM >>>>
