Media: copper, LVDS-28 bit
Record Length: fixed, 7 frames
| TS\Bit | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| 1 | BOR | HP | SC [12:7] | XPT+TC | XPT-TC | XPT+NC | XPT-NC | PM | GI | Rec Type | ||||||||||||||||||
| 2 | HP | SC [6:1] | HPT+TC | HPT-TC | HPT+NC | HPT-NC | OL-OCT | SCL | FX | |||||||||||||||||||
| 3 | HP | SC [0] | MSC [8:4] | MPT+TC | MPT-TC | MPT+NC | MPT-NC | 0 | T1 | T2 | #PSC | |||||||||||||||||
| 4 | HP | 0 | MSC [3:0] | LPT+TC | LPT-TC | LPT+NC | LPT-NC | SUM of pT | ||||||||||||||||||||
| 5 | HP | Isolated Track Octant | Isolated Track Octant | Isolated Track Octant | ||||||||||||||||||||||||
| 6 | HP | Octant | RA High Pt Sector | 0 | Isolated Track Octant | Isolated Track Octant | ||||||||||||||||||||||
| 7 | Vertical Parity | |||||||||||||||||||||||||||
note: empty cells or cells marked 'reserved' will contain zeros
BOR Beginning of record, "111"
HP Horizontal Parity bit
*PT+*C Track counts sorted by:
PT (X=max, H=high, M=medium, L=low)
Curvature (+ or -)
CPS cluster association (T=tight match, N=no match)
PM Pass-and-Mark, not supported, "00"
SC Singlet Count. The total number of hit singlets in this octant
range is 0 - 4800. Not truncated.
MSC This field indicates the highest sector occupancy (expressed in singlet hits)
in the octant. Range is 0 - 480. Not truncated.
GI Set if at least one isolated track in the octant is located in a
sector with occupancy below a given value.
Rec Type L1 record, "111"
OL-OCT Octant occupancy level, based on doublet counts.
Note this IS truncated!
SCL SCLinit control bit
FX First Crossing control bit marks bunch crossing number 7
Octant The octant number, range 0-7
Rec Type L1 record, "111"
T1 Set if at least one isolated track in the octant is loosely
associated with one CPS cluster. NOTE: loose cluster matching
is not supported so this bit is always zero.
T2 Set if at least one isolated track in the octant is loosely
associated with two CPS clusters. NOTE: loose cluster matching
is not supported so this bit is always zero
#PSC The number of CPS clusters found in this Octant ("111" means 7 or more)
Sum of pT The total sum of transverse momentum for all tracks found in this Octant
Isolated Track Octant = If only one track is found in this sector and no tracks
are found either of the adjacent sectors this byte will be
filled in as follows:
bit 7: Set to indicate a valid isolated track byte. If this bit is
cleared ignore the rest of the byte.
bits [6:4]: CPS cluster association "001" = tight match, "000" = no match
bit 3: Track curvature bit
bits[2:1]: Track PT bin ("00" = Max, "01" = High, "10" = Medium, "11" = Low)
bit 0: Set to indicate that the sector doublet occupancy is below a given
threshold, currently ~6%
RA High pT Sector The relative address (0-9) of the sector in this octant with the
highest sum of Pt.
VP Vertical Parity bit
01 Nov 2005: created JTO
03 Jan 2006: added parity links JTO
26 May 2006: ugh... previous versions were wrong (DFEA2 L1 record) fixed now JTO
14 Nov 2006: added vertical parity, identify the fields that the CTTT actually looks at.
removed reference to "Rel Sector" field.
19 Jan 2007: added SC and MSC sector count fields.
30 Jan 2007: added note concerning T1 and T2 fields.