[time-nuts] NTGS55A Undocumented TSIP data

Sam lists at digitalelectric.com.au
Mon May 7 04:48:01 UTC 2012


Example Packet:

10 8F AE 01 00 00 09 00 02 00 00 00 41 00 01 F4 00 5A 00 00 3D AE 81 20 3B F2 14 BD 10 03


Packet Breakdown:

10 8F AE 01 00 00


09 = LED Status

5 LED's on front panel

Yellow
Red
Green
Locked
Holdover

01 Yellow
02 Red
03 Yellow, Red
04 Green
05 Yellow, Green
06 Red, Green
07 Yellow, Red, Green
08 Locked
09 Yellow, Locked
11 Yellow, Holdover
12 Red, Holdover
13 Yellow, Red, Holdover
14 Green, Holdover
15 Yellow, Green, Holdover
16 Red, Green, Holdover
17 Yellow, Green, Holdover
18 Locked, Holdover
19 Yellow, Locked, Holdover



00 = Frequency FOM

00 Stable
01 Stabilizing
02 Unlocked/Holdover
03 Unlocked/Power-up


02 = Time FOM

00  <1 ns
01  1ns to 10ns
02  10ns to 100ns
03  100ns to 1µs
04  1µs to 10 µs
05  10 µs to 100 µs
06  100 µs to 1 ms
07  1 ms to 10 ms
8  10 ms to 100 ms
09  >100 ms



00 = Holdover Reason

00 Not In Holdover
01 No GPS Data
02 GPS Data Invalid
03 TRAIM Reject
04 Manual Holdover
05 In Recovery
06 Antenna Fault
07



00 = 16X PLL Lock

00 Locked
01 Unlocked



00 = Mode

00 Normal
01 Power Up
02 Auto Holdover
03 manual Holdover
04 Recovery
05 Fast Recovery
06 Disabled
07 5 Minute Recovery
08 Free Run
09 Firmware Restart



41 = Flash Device in use

41 A
42 B
43 C
44 D
45 E
46 F 


00 01 F4 00 5A 00 00 3D AE 81 20 3B F2 14 BD 10 03



Which looks to be the TSIP version of the SCPI Time Code Query.



Time Code Query
This command returns the timecode message 980ms to 20ms (inclusive) prior to the next Even_Second 
of indicated time.  An  example of the response is:  T1#H20AF16AC41+00B4 

* T1 = Format identifier.

* #H = Number representation identifier.

* 20AF16AC = GPS time in seconds of the next 1 PPS on-time edge.  The 1 PPS edge being 
referenced is the internal 1 PPS used by the GPSTM and does not appear as an output from 
the GPSTM.  (If two requests for the time of day query occur one second apart, one response 
will be associated with both the internal 1 PPS and the external Even_Second, while the other 
response will only be associated with the internal 1 PPS signal.)

* 4 = Time figure of merit (TFOM).

* 1 = Frequency figure of merit (FFOM).

* + = Leap second information.  A "+" sign indicates a pending GPS leap second, while a "0" to indicate no pending GPS leap second.

* 0 = Alarm indication.

* 0 = Service request.

* B4 = Checksum.

The format of GPS time is a 32-bit integer represented in HEX.  The TFOM message is defined as the 
integer part of 10*log(time error in ns);
* 0  <1 ns
* 1  1ns to 10ns
* 2  10ns to 100ns
* 3  100ns to 1µs
* 4  1µs to 10 µs
* 5  10 µs to 100 µs
* 6  100 µs to 1 ms
* 7  1 ms to 10 ms
* 8  10 ms to 100 ms
* 9  >100 ms




//Sam.













----- Original Message -----
From: Mark Sims
[mailto:holrum at hotmail.com]
To: time-nuts at febo.com
Sent: Mon, 07 May 2012
12:22:05 +1000
Subject: [time-nuts] NTGS55A Undocumented TSIP data


> 
> The Nortel NTGS55A receivers output an undocumented 8F-AE data packet every
> second.  The Palisade receivers also output an 8F-AE packet,  but it is
> totally  different.  The last 8 bytes appear to be two 32-bit floating point
> numbers that change every packet. One of the numbers appears to occasionally
> track the PPS error value.  The rest of the packet looks like static data
> values.   Does anybody have any info on the Nortrel 8F-AE packet?   		 	  
> 		  
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