CHDO 090, MM TIS Packet Secondary, Turbo-era
CHDO Number: 090
Name/Purpose: Multi-Mission TIS Packet Secondary, Turbo-era Data
Usage: TIS puts this CHDO on all packets extracted from frames with 
secondary CHDO 079.  This CHDO will not keep most of the information from 
CHDO 079 intact, but it will keep enough to allow tracing back to the 
original frame for analysis purposes.

Note - all acronyms are in the glossary of the parent module of this 
sub-module: 820-013, 0172-Telecomm-CHDO.

Creation Date: Submitted to DSN August 14, 2003
CHDO Dependencies: This CHDO is created from CHDO 069, and also uses 
information from CHDO 078.



Change Log

Rev.
Check if Minor Rev. 
Issue Date
Affected Sections
Change Summary


8/14/2003
---------
Initial submittal to DSN, from SFOC/AMMOS.

Initial changes not tracked under current system:
8/14/2003 - added retransmission bit
10/29/03 - Changed because CHDO 89 removed entirely, so this CHDO serves both 
frame types (CCSDS version 1 and 2)
11/04/03 - moved retransmission bit to byte 10 bit 6
12/12/03 - added mcfc_inc field back in, was in 89, now needs to be in here 
also. Removed sec_hdr_bit_invalid flag, no longer needed re CR 8370 change

A
5/15/2005
---------
2/1/05 - CHDO 71 mentioned above should be CHDO 79 instead.
7/30/04 CR 8562 (AMMOS V29.0 B7) added field "offset" to bytes 68-69

B
5/31/2007
---------
retransmission bit moved from byte 10 bit 6, to byte 10 bit 1, CR #101041

ert_ext_res_units added into byte 10, bit 6, CR# 101041

lock_count and lrn description changed to refer to parent document, not a 
substantive change

Changed DSN, TTACS, and AMMOS to DTT, TTI, and TTD, respectively, due to JPL 
re-organization. Referred lock_count and lrn to parent module.

C
x
7/30/2010
---------
scft_id, data_source, virtual_channel_id, lrn, relay_scft_id
changes in explanations only, no significant change



Bits-> 0   1   2   3   4   5   6   7   8   9   10  11  12  13  14  15
byte |---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---|
   0 |                           chdo_type                           |
     |---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---|
   2 |                          chdo_length                          |
     |---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---|
   4 |         originator            |       last_modifier           |
     |---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---|
   6 |                            scft_id                            |
     |---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---|
   8 |           data_source         |            decode_method      |
     |---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---|
  10 |                            flags                              |
     |---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---|
  12 |                                                               |
     +---                                                         ---+
  14 |                                                               |
     +---                                                         ---+
  16 |                       ert                                     |
     +---                                                         ---+
  18 |                                                               |
     |---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---|
  20 |                                                               |
     +---                           rsn                           ---+
  22 |                                                               |
     |---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---|
  24 |      virtual_stream_id        |     virtual_channel_id        |
     |---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---|
  26 |                                                               |
     +---                       bit_rate                          ---+
  28 |                                                               |
     |---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---|
  30 |                version    | sub-version   |  build            |
     |---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---|
  32 |          orig_source          |         curr_source           |
     |---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---|
  34 |                                                               |
     +---                                                         ---+
  36 |                        rct                                    |
     +---                                                         ---+
  38 |                                                               |
     |---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---|
  40 |                      anomaly_flags                            |
     |---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---|
  42 |                           lock_count                          |
     |---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---|
  44 |                              lrn                              |
     |---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---|
  46 |          sc_flags             |              decode_status    |
     |---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---|
  48 |            sync_flags         |           spare               |
     |---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---|
  50 |       frame_hdr_error_flag    |           mcfc                |
     |---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---|
  52 |                      relay_scft_id                            |
     |---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---|
  54 |                                                               |
     +---                                                         ---+
  56 |                        pub                                    |
     +---                                                         ---+
  58 |                                                               |
     |---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---|
  60 |                       pass_number                             |
     |---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---|
  62 |     frame_extract_count       |              spare            |
     +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
  64 |                                                               |
     +---                        vcfc                             ---|
  66 |                                                               |
     +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
  68 |                         offset                                |
     +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
  70 |                                                               |
     +---                     spare                               ---+
  72 |                                                               |
     |---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---|
  74 



Byte Offset
Field ID Definition
Format
Units
Range or Value

0 - 1
chdo_type
Type of this secondary CHDO 
binary unsigned integer
N/A
90

2 - 3
chdo_length
Length of this secondary CHDO; (indicates the length, in octets, of the 
value field of the secondary CHDO); 
binary unsigned integer
bytes
70

4
originator
Originator identifier; The complete set of values for this field can be 
found in 820-013, 0172-Telecomm-CHDO.
48=DTT
00=TTI
114=SIM
binary unsigned integer
N/A
48, 00, 114

5
last_modifier
Last modifier identifier; value = 117(TIS).  The complete set of values for 
this field can be found in 820-013, 0172-Telecomm-CHDO.
117=TIS
binary unsigned integer
N/A
117

6 - 7
scft_id
See CHDO 078, Bytes 6-7.  If TIS forces the spacecraft ID of the parent 
frame, this will reflect that force, and field scid_force will be set. The 
definitions of this number are in 820-013, OPS-6-21-4 (table 4)
binary unsigned integer
N/A
0-1023 (if version 1) or
0-255
(if version 1)

8
data_source
See CHDO 078, Byte 10. The definitions of this number are in 820-013, 
OPS-6-21-47 (table 47)
binary unsigned integer
N/A
0-255

9
decode_method
Type of decoding used for this frame or the extracted packet's parent frame. 
Decoding method is specific to the mission and the data type.  For list of 
values see field "decode_method"  in 0172-Telecomm-CHDO.

binary unsigned integer
N/A
0-4

10-11
flags

Bit 0
data_val
Set to 1 if this is an anomaly record, and there is no data in the data 
CHDO.  (Explanation of anomaly records is in 820-013, 0172-Telecomm-CHDO.  
If set, the field "anomaly_flags" will have at least one bit set.
binary unsigned integer
N/A
0,1

Bit 1
retransmission
When the parent frame contributing bit 1 (first bit) of this packet has the 
retransmission flag bit set in secondary CHDO 069, then this bit is set to 
one (1), otherwise it is zero.
binary unsigned integer
N/A
0,1

Bits 2-3
spare
0,1

Bit 4
ert_ref_point
Earth Received Time (ERT) reference point;
0 = the ERT refers to the trailing edge of the last received telemetry bit 
in the SFDU
1 = the ERT refers to the leading edge of the first received telemetry bit 
in the SFDU
binary unsigned integer.  TIS does not use or change this field.
binary unsigned integer
N/A
0,1

Bit 5
ert_extended_resolution
ERT extended resolution field status;
0 = the ERT extended resolution field is reserved and its value should be 
ignored
1 = the ERT extended resolution field is valid
binary unsigned integer.  TIS uses this field to determine how to process 
ERT.
binary unsigned integer
N/A
0,1

Bit 6
ert_ext_res_units
Defines units of the 2-byte ERT extended resolution field:
0 = microseconds of millisecond
1 = tenths of microseconds of millisecond 
binary unsigned integer
N/A
0,1

Bit 7
ert_status
ERT status;
0 = ERT is valid
1 = ERT is known to be invalid
binary unsigned integer.  TIS does not use or change this field.  If this 
field is set to 1, the ERT of this data and all data extracted from it will 
be invalid.
binary unsigned integer
N/A
0,1

Bits 8-15
spare

12 - 19
ert
Earth received time; the format of this field is defined in 820-013, 
173-Telecomm-Time, 6- or 8-byte GDR binary time format.  See CHDO 078, 
Bytes 14-21.   The bit flag "ert_extended_resolution, if set, means this 
will be the 8-byte.  If clear, this will be the 6-byte format. TIS will 
always adjust time of frames to be leading edge of the first bit, if 
possible.  It is possible that the resolution of the time and the bit rate 
will be such that leading vs trailing edge will not change the time at all, 
and in that case, TIS will not bother trying to adjust from trailing edge to 
leading edge.  However, DTT can put either leading edge of first bit or 
trailing edge of last bit, so TIS will always change it to the first bit, in 
any case.
binary unsigned integer
varies within field, see ref'nce
N/A

20 - 23
rsn
See CHDO 078, bytes 22-25.  Record sequence number; binary unsigned 
integer.  This is the rsn of the parent frame providing the first bit of 
this packet.
binary unsigned integer
N/A
0-4294967295

24
virtual_stream_id
Virtual stream identifier; value range 0 to 255; binary unsigned integer.  
(Refer to 820-013, 0161-Telecomm for details about the virtual stream.)  TIS 
does not change or use this field.
binary unsigned integer
N/A
0-255

25
virtual_channel_id
Virtual channel identifier; binary unsigned integer.  (Refer to Refer to 
820-013, 0161-Telecomm for details about the virtual stream.)  The virtual 
channel ID is obtained from the spacecraft data by DTT if this data has gone 
through DTT, or by TIS during TTI processing. TIS may change this field if 
it was set by the DTT but TIS re-synced the data, if for some unusual reason 
it differed (this field is taken by both DTT and TIS from the CCSDS frame 
primary header).  This is the ID of the parent frame of this packet.
Maximum is 7 (CCSDS frame version1) or 63 (CCSDS frame version 2)
binary unsigned integer
N/A
0-varies

26 - 29
bit_rate
See CHDO 078, Bytes 38-41. TIS does not change this field.  TIS uses this 
field to calculate the ERT if necessary.  In DTT turbo-decoded data, TIS 
does not change the ERT.
IEEE Float
bit per second
almost infinite, but always positive

30-31
version_build
See 820-013, 0172-Telecomm-CHDO, field "AMMOS Version/Build".
binary unsigned integers
N/A
see ref doc

32
orig_source
Indicates the original input path of the data causing this record's 
creation.  This field is not changed by TIS.  Valid values are defined in 
820-013, 0172-Telecomm-CHDO
binary unsigned integer
N/A
0-255

33
curr_source
Indicates the current input path of the data causing this record's creation. 
This field may be changed by TIS according to the input data's current 
source. Valid values are defined in 820-013, 0172-Telecomm-CHDO
binary unsigned integer
N/A
0-255

34-39
rct
Record Creation Time.  This field contains the system clock time when the 
record was created by TIS.  For the format see 820-013, 0173-Telecomm-TIME, 
6-byte GDR format
binary unsigned integers
varies within field, see ref'nce
N/A

40-41
anomaly_flags
These flags are used to indicate an end in the sequence of normal sequential 
data of this record type.  On normal good data, all flags are set to 0.  An 
anomaly record is typically generated by copying the last normal record's 
entire SFDU header (label + CHDOs), and by setting the appropriate flags 
indicating the anomaly's cause.  Anomaly records contain a null data CHDO.  
When any of these flags are set, the data_val flag in field "flags" is also 
set, and the data length is set to 0. (These records have no data, just the 
SFDU header.)  See anomaly_flags in 820-013, 0172-Telecomm-CHDO
binary unsigned integer
N/A

42-43
lock_count
See 820-013, 0172-Telecomm-CHDO for explanation of this counter, section 
"lock count".
binary unsigned integer
N/A
0-65525

44-45
lrn
See 820-013, 0172-Telecomm-CHDO for explanation of this counter, see section 
"logical record number".
binary unsigned integer
N/A
0-65535
46
sc_flags

Bit 0
relay
=1 if this data was relayed through another spacecraft
=0 if not
binary unsigned integer
N/A
0,1

Bits 1-2
frame_type
MER etc. would use these 2 bits for the frame type of the parent frame. 
Mission-specific meaning.
binary unsigned integer
N/A
0-3

Bits 3-7
Spare

47
decode_status
See 820-013, 0172-Telecomm-CHDO, field "decode status".  In general, packets 
will not be made from frames where decoding or CRC/checksum checking failed, 
but in extreme cases, it may be requested by a mission.
binary unsigned integer
N/A
0-5

48
sync_flags
Frame synchronization status flags.

Bit 0
spare

Bit 1
spare

Bit 2
scid_force
Indicates whether the spacecraft ID (scft_id)was overridden by an 
operator-specified value.
0 = Not overridden
1 = The spacecraft identifier code has been overlaid with a new 
TIS-operator-entered spacecraft ID value.
binary unsigned integer
N/A
0,1

Bits 3-6
spare

Bit 7
tds_suspect_sclk_flag. 
This is set by TDS to indicate whether TDS considers the SCLK valid or an 
anomaly.
0 =  SCLK is valid
1 = SCLK is suspect (by TDS standards).  TDS sets this when loading data, 
when SFDUs have been queued up due to a time regression and the input stream 
ends. The bit is set in each queued SFDU which are all then flushed to the 
last open spooler.  In TDM data this is set when SCLK is not in reference, 
but this does not apply to packet data.
binary unsigned integer
N/A
0,1

49
spare

50
frame_hdr_error_flag
As defined in the Packet Frame Synchronization requirements, these eight 
1-bit fields are defined as follows:
binary unsigned integer
N/A
0,1

Bit 0
codeword_valid
0 = valid codeword, 1 = invalid codeword.
binary unsigned integer
N/A
0,1

Bit 1
transfer_frame_version
0 = Transfer frame version is valid.
1 = Transfer frame version is invalid.
binary unsigned integer
N/A
0,1

Bit 2
scid_correct
0 = S/C ID correct (matches expected value for this mission)
1 = incorrect.
binary unsigned integer
N/A
0,1

Bit 3
spare
binary unsigned integer

Bit 4
vcfc_inc
0 = Virtual Channel Frame Count increments correctly, 
1 = error - vcfc does not increment by 1 since immediately previous frame in 
this virtual channel.
binary unsigned integer
N/A
0,1

Bit 5
sec_hdr_bit_valid
Secondary header means the CCSDS telemetry packet header, all packets except 
idle (fill) packets require a secondary CCSDS header.
0 = Secondary Header flag valid, 
1 = Secondary Header flag invalid.
binary unsigned integer
N/A
0,1

Bit 6
packet_order_valid
the CCSDS packet header flag "packet order" should be zero.  
0 = Packet Order flag valid (set to zero)
1 = Packet Order flag invalid (set to 1)
binary unsigned integer
N/A
0,1

Bit 7
invalid_vc
Invalid virtual channel (only for missions which require a VC check) 
0=valid
1=invalid
binary unsigned integer
N/A
0,1

51
mcfc
master channel frame count, of parent frame supplying bit one of this 
packet.  This field is unused if parent frame type is AOS or CCSDS version 2.
binary unsigned integer
N/A
0,1

52-53
relay_scft_id
Spacecraft ID of last spacecraft relaying this data (scft_id of this data is 
in normal position in byte 6).  See 820-013, OPS-6-21-4 (Table 4) for valid 
values.
binary unsigned integer
N/A
0-65535

54-59
pub
An ASCII string comprising six project-unique bytes (characters), entered 
into the TIS subsystem by user control directive.  TIS places into these 
bytes whatever the user has entered.  This field is handy for testers to 
mark the data, sometimes with a test number, an ATLO step number, etc etc.
ASCII
N/A
N/A

60-61
pass_number
binary unsigned integer
N/A
0-65535

62
frame_extract_count
number of frames this packet was made from.  maximum is 30 for MMT due to 
CHDO length field constraints (16 bits)
binary unsigned integer
frames
0-255

63 
spare

64-67
vcfc
virtual channel frame count from the parent frame containing bit 1 of this 
packet.  If the parent frame of this packet was not an AOS frame, the vcfc 
will be 0-255, and right-justified in this field.  If an AOS frame, max 
value is 24 bit max value.
binary unsigned integer
N/A
0-16777215

68-69
offset
Offset of first byte of this packet into parent frame, in bytes, with byte 
zero being the first byte of the frame's data area (i.e. not including the 
telemetry frame header).
binary unsigned integer
N/A
0-64767

70-73
spare


This document has been reviewed for export control, and does NOT contain 
controlled technical data.