[Sls-slp] Re: Prox-1 Data Link Review Telecon #1

Greenberg, Edward (313B) edward.greenberg at jpl.nasa.gov
Fri Feb 4 19:33:11 UTC 2011

The Prox link protocol has some features that are required/desired for time correlation.  The Collection of ingress and egress frames can provide very accurate correlation between the MRO spacecraft and the Lander (rover/remote node).  Note that for the MSL mission the one way light time varies from about 1-5 milliseconds.  The question I would like to raise is should we add a new supervisory command that can pass the orbiters frame time tag data to the lander/rover/remote node.  For Mars and MRO the Electra could be updated to use the time Distribution Supervisory Command to send the “Proper Time” that the lander can use to tag its data because the inaccuracy of that time in within 50 milliseconds of UTC.  Should we add specifics to the Time Distribution PDU.

Type 2

On 2/3/11 10:21 AM, "Greg Kazz" <greg.j.kazz at jpl.nasa.gov> wrote:


We will need to reschedule this telecon to Feb 15 (Tue) - again from 8AM Pacific/5 PM European time due to the passing of one of our WG group’s family member which I just learned about.
Dial in number is still the same. Please dial into: +1 818 393-1870

Best regards,


On 2/2/11 4:15 PM, "gkazz" <greg.j.kazz at jpl.nasa.gov> wrote:


As promised, I’ve set up a Meet me telecon number for you to call in on, to participate in the on-going 5-year CCSDS review of the Prox-1 Space Data Link Protocol.

The first telecon is scheduled for 8 AM Pacific/5 PM European time on Feb 8 (Tue.)

Please dial into: +1 818 393-1870

I would appreciate it if you would RSVP with an email back to me letting me know if you do plan to participate on the telecon.

The material you should review before the meeting which will be discussed is on the CWE at:


The file names are:

 1.  Word document – CCSDS_211.0-B-4-Feb01_2011
 2.  PDF – Updated_Prox1_FD_Jan19_2011 (contains the full duplex Prox-1 state diagram that doesn’t format well in the word document – use this one to see the proposed changes to this state diagram)

Best regards,

Greg Kazz

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