I listen to ATC quite often and the US is going towards CPDLC. What frequency is CPDLC on, and does it sound like ACARS on 131.55Mhz.
What freq. is CPDLC on
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doctordialtone
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Controller–pilot data link communications - Wikipedia
en.wikipedia.org
VHF Data Link - Mode 2 (VDL-M2) - Signal Identification Wiki
VDL-M2 (Known as VDL2 or VDLM2) is a means of sending information between aircraft and ground stations. VDL Mode 2 is the only VDL mode being implemented operationally to support Controller Pilot Data Link Communications (CPDLC). An extension to the AVLC protocol permits ACARS over AVLC (AOA)...
Frequencies
136.650 USA (ARINC)
136.700 USA (ARINC)
136.800 USA (SITA)
136.725 Europe (ARINC)
136.775 Europe (SITA)
136.825 Europe (ARINC)
136.875 Europe (SITA)
136.975 Worldwide (SITA & ARINC)
Common to see aircraft that are not VDL2 equipped but CPDLC equipped. This was on 131.550. This from YOW, you're not seeing this in YYZ ?
[#5 (L:+27 E:0) 01/12/2018 16:47:45.000 --------------------------------
Mode : 2 Label : AA Id : Q Nak
Aircraft reg: C-FRAM Flight id:
No:
/YYZE2YA.AT1.C-FRAM20C2FAEA522A48934D049A6820CE4106AD49F360D48B1104D8B4E9C18F150549E821CF9D1A4D29A821D089321A0873E754830EA20AF26A4841527D29F3AA4F410E2CEA91690085C4
FANS-1/A CPDLC Message:
CPDLC Uplink Message:
Header:
Msg ID: 1
Timestamp: 16:47:43
Message data:
[freetext]
THIS IS AN AUTOMATED MESSAGE TO CONFIRM CPDLC CONTACT WITH TORONTO CENTER
ATCTech
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I haven't monitored conventional ACARS or VDL2 for quite a while now, no. In digging in deeper last night I did however find that FANS mode 1/A using POA has been implemented very recently (during 2019) providing CPDLC communications after message delivery and latency testing done between the FAA, Boeing, airline operators and the network and equipment providers. When I left the ATC environment in late 2015 this hadn't begun. It is not exclusive to Canada.
Speaking of CPDLC in the USA, I see that in addition to Kansas City and Indianapolis, Washington Center has recently started using it for enroute operations. AFIK these are the only 3 Centers using it right now for enroute comms. Anyone here able to get uplinks and decode it in these areas ? I'd be interested in seeing some logs (PM me). I'm curious to what extent the US domestic fleet is equipped and using it these days.
From the limited time I have monitored VDL2 in these areas it appeared they were using 136.650 more often for enroute CPDLC ops, vs 136.975. Any reports appreciated.
AS
From the limited time I have monitored VDL2 in these areas it appeared they were using 136.650 more often for enroute CPDLC ops, vs 136.975. Any reports appreciated.
AS
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spanky15805
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Probably wrong but I was always under the impression that cpdlc data was going though the ads system.
IS CPDLC being received on standard ACARS frequencies?
ATCTech
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I corrected my post a couple of messages later to confirm what AirScan had posted. POA is indeed carrying FANS 1/A traffic, which is CPDLC content. If you care to read the actual FAA report on the study that was undertaken to validate FANS 1/A over POA, it's here: https://www.faa.gov/about/office_or...eco/media/2016/160518_PARCNonVDLmode2Recs.pdf
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Oops I missed that post. Am I correct to assume that VDL2 is the primary mode and ACARS is reversionary mode for most operators?
ATCTech
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CPDLC can or will be be carried on many platforms. VDL both terrestrial and satellite, legacy (POA) ACARS and is/was even on HF via HFDL. although I don't watch HFDL enough to say positively I've ever seen ATC instructions on that network. There's lots of good information from my friends at Universal Avionics here: https://www.uasc.com/docs/default-s...rs/uasc_fans_whitepaper.pdf?sfvrsn=d81d985c_4
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Thanks for all the helpful information!
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