UIT - Secteur de la normalisation des télécommunications
ITU - Telecommunication Standardization Sector
UIT - Sector de Normalización de las Telecomunicaciones
Study Period 2001-2004
Commission d' études 

Study Group
 16
Comisión de Estudio 
Contributi on tardive 

Delayed Contributi on  D.100 (WP1/16)
Contribuci ón tardía 
Porto Seguro, 28 May – 8 June 2001
Texte disponible seulement en 

Text available only in
 E
Texto disponible solamente en 

___________________
Question(s): 14/16
SOURCE*:
United States of America
TITLE:
Proposal for amendment of T.30 bit assignment in accordance with
Amendment 1 of T.89
___________________
ABSTRACT:
This contribution proposes amendment of reserved Recommendation T.30 Table 2 DIS/DCS bit
assignments to accommodate the proposed Amendment 1 of T.89, which is documented in a
separate contribution.
REQUESTED ACTION:
Consider the proposed amendment of Recommendation T.30 Table 2 DIS/DCS bit assignments for
‘Consent’, in accordance with A.8, during the plenary session of these meetings.
* Contact:
Lloyd McIntyre
Tel:
+1 650 813 6762
Fax:
+1 650 813 6860
E-mail: Imcintyre@pahv.xerox.com
Attention: This is not a publication made available to the public, but an internal ITU-T Document intended only for use by the
Member States of the ITU, by ITU-T Sector Members and Associates, and their respective staff and collaborators in their ITU related
work. It shall not be made available to, and used by, any other persons or entities without the prior written consent of the ITU-T.
ITU-T\SG_DOC\SG16\BRAZIL01\DELAYED\D-100.DOC
06/02/2016
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PROPOSAL:
Per COM16 R2, SG16 approved T.30 Amendment 2, which includes assignment of three (3) new
bits designated as “T.89 (Application profiles for Recommendation T.88), for negotiation of JBIG2
application profiles. The meanings of five (5) of the seven (7) values of the associated bits were
assigned and the remaining three values were reserved for future use. This contribution proposes
definition of two of the reserved values as follows:
Amend Table 2/T.30
Change meaning of bits y, y+1 and y+2 as document in T30 Amendment 2 (prepublished) per
the mark-up below: Bit No.
DIS/DTC
Note
AA, BB
DCS
y, y+1,
y+2
T.89 (Application profiles for
Recommendation T.88)
T.89 (Application profiles for
Recommendation T.88)
(0,0,0)
Not used
Not used
(0,0,1)
Profile 1
Profile 1
(0,1,0)
Profile 2
Profile 2
(0,1,1)
Profile 3
Profile 3
(1,0,0)
Profile 2 and 3
Invalid
(1,0,1)
Profile 4
Profile 4
(1,1,0)
Profile 5
Profile 5
(1,1,1)
Reserved
Reserved
Note
AA, AB
Change “Note BB” as document in T30 Amendment 2 (prepublished) per the mark-up below:
BB: In a DIS/DTC frame, setting the value of bits y through y+2 to "0" indicates that the called terminal
does not have the capability to accept T.89 profiles of JBIG2 (T.88). Setting the value of bits y through y+2
to non-zero (> 0) indicates that the called terminal does have the capability to accept JBIG2 encoded pages.
Each of the non-zero values of bits y through y+2 represents a different level of JBIG2 profile support.
Support for Profile 1 is mandatory for all JBIG2 implementations. In other words, implementations of
profile(s) greater than Profile 1 will also include support for Profile 1, although the Profile 1 bit is not
activated. Additionally, support for a profile of a particular base coder (i.e. Arithmetic or Huffman) shall
also include support for lower level profiles (i.e. lower numbered profiles) of the same base coder. For
example, support for Profile 4 (Arithmetic based) shall also include support for Profile 3 (Arithmetic) and
Profile 1, which is the base profile, however, support for Profile 2 (Huffman based) is not required.
Interpretation of the profiles is defined in Recommendation T.89 (Application Profiles for Recommendation
T.88). Bits y through y+2 are valid only when bits 92 through 94 comprise a value equal or greater than "4"
(i.e. T.44 or T.4 Annex H "Black-and-White Mixed Raster Content Profile (MRCbw)" provision and Mode
4 or greater of each is available). The value of bits 117 through 118 is typically non-zero (i.e. >0). In a DCS
frame, setting the value of bits y through y+2 to "0" indicates that the calling terminal does not transmit
JBIG2 encoded pages. Setting the value of bits y through y+2 to non-zero (i.e. > 0) indicates that the calling
terminal transmits JBIG2 encoded pages. The non-zero value of bits y through y+2 identifies the profile of
T.89 that is used during the transmission. Bits y through y+2 are valid only when bits 92 through 94
comprise a value equal or greater than "4". The value of bits 117 through 118 is typically non-zero (i.e. >0).
The calling terminal shall not transmit a dictionary (e.g. symbol or halftone pattern dicitonaries) or a
collection of dictionaries that result in outstanding dictionary memory requirement (i.e. sum of all
transmitted dictionaries for which a forget disposition has not been issued) greater than the capacity
indicated by the value of DIS/DTC bits 117 through 118.
____________________
ITU-T\SG_DOC\SG16\BRAZIL01\DELAYED\D-100.DOC
06/02/2016