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7_3_04.TXT
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- 5i'
- ANNEX A
- (to Recommendation T.30)
- Procedure for G3 document facsimile transmission in the general
- switched telephone network incorporating error correction
- A.1 Introduction
- A.1.1 This Annex is intended to apply to document facsimile
- apparatus covered by Recommendation T.4, Annex A. It describes the
- procedures and signals to be used where facsimile equipment incor-
- porates error correction capabilities. When existing equipment is
- operating in a non-CCITT manner, they shall not interfere with
- equipment operating in accordance with the Series T Recommendation.
- A.1.2 Use of this Annex is optional
- A.1.3 Outline of the error correction method
- The error correction method described in this Annex is based
- on the half-duplex page selective repeat ARQ (automatic repeat
- request) technique.
- An HDLC frame structure is utilized for all binary coded fac-
- simile message procedures.
- The transmitting terminal can decide to use either 256 or 64
- octets for the frame size by using DCS command. The receiving ter-
- minal must be able to receive 256 and 64 octets of frame size.
- The transmitting station divides the coded data specified in
- Recommendation T.4, S 4 into a number of frames and transmits them
- with each frame number.
- When the previous message has not been satisfactorily
- received, the receiving station transmits PPR response to indicate
- that the frames specified in the associated facsimile information
- field are required to be retransmitted.
- When PPR is received, the transmitting station retransmits the
- requested frames specified in PPR information field.
- When PPR is received four times for the same block, either the
- EOR command is transmitted for end of retransmission or CTC (con-
- tinue to correct) command is sent for continuous retransmission.
- In the case of continuous retransmission, the modem speed may
- fall back or continue at the same speed in accordance with the
- decision of the transmitting terminal.
- A.2 Definitions
- A.2.1 The signals and definitions used in the error correction
- procedure are as defined in the main body of this Recommendation
- unless specified otherwise.
- A.2.2 Frame formats of RCP frame and FCD frame for the
- in-message procedure are defined in Recommendation T.4, Annex A.
- A.2.3 Relations between a page, blocks, partial pages and
- frames
- One page of coded data as specified in Recommendation T.4, S 4
- is divided into a number of blocks. The block contains a number of
- frames. A partial page is defined as one transmitted block or a
- number of retransmitted frames.
- A.2.4 Block size
- The block size is defined as the maximum number of frames that
- can be sent by the transmitter before receiving the response.
- A.3 Block size and frame size
- A.3.1 For T.4 error correction mode, a transmitting terminal
- indicates frame size by using DCS signal.
- A.3.2 The following values of frame size are applicable: 256
- or 64 octets. These values of frame size do not include either FCF
- or frame number octet. Therefore, the total length of the HDLC
- information field including both the FCF and the frame number octet
- is as follows: 258 or 66 octets.
- A.3.3 The receiving terminal must have the following condi-
- tion:
- frame size: 256 or 64 octets.
- block size: 256 frames.
- A.3.4 The transmitting terminal may send the block whose size
- is less than 256 frames at the end of each page. This block is
- called a short block
- A.3.5 The frame size should not be changed during a transmis-
- sion of one page. In order to change the frame size, indication of
- mode change should be made using PPS | (mu | OM or EOR | (mu | OM
- command at the page boundary.
- A.4 Information field | (see also S 5.3.6)
- The HDLC information field is of variable length and contains
- the specific information for the control and message interchange
- between two facsimile stations. In this Recommendation it is
- divided into two parts, the facsimile control field (FCF) and the
- facsimile information field (FIF).
- 1) Facsimile control field (FCF) - The facsimile
- control field is defined to be the first 8 bits or 16 bits of the
- HDLC information field. FCF of 16 bits should be applied only for
- the optional T.4 error correction mode. This field contains the
- complete information regarding the type of information being
- exchanged and the position in the overall sequence. The bit assign-
- ments within the FCF are as follows:
- Where X appears as the first bit of FCF, X will be defined
- as follows:
- - X is set to 1 by the station which receives a
- valid DIS signal;
- - X is set to 0 by the station which receives a
- valid and appropriate response to a DIS signal;
- - X will remain unchanged until the station again
- enters the beginning of phase B.
- 2) Facsimile information field (FIF) - In many
- cases the FCF will be followed by the transmission of additional
- 8-bit octets to further clarify the facsimile procedure. This
- information for the basic binary coded system would consist of the
- definition of the information in DIS, DCS, DTC, CSI, CIG, TSI, NSC,
- NSF, NSS, CTC, PPS and PPR signals.
- A.4.1 Command to receive | (see also S 5.3.6.1.3)
- From the transmitter to the receiver.
- Format: X100 XXXX
- 1) Continue to correct (CTC) - This command indi-
- cates that the transmitting station shall continue to correct the
- previous message. (This is a response to the 4th PPR received, and
- indicates that the transmitting station shall immediately send the
- requested frames specified in PPR information field.)
- When the transmitter receives PPR four times, the modem
- speed may fall back or continue the previous transmission speed
- using CTC command.
- This command should have the FIF of 2 octets, which
- corresponds to the bits No. 1-16 of DCS standard command (See
- Table 2/T.30). The receiving terminal uses only the bits No. 11-14
- to determine the data signalling rate.
- Format: X100 1000
- A.4.2 Pre-message response signals | (see also S
- 5.3.6.1.4)
- From the receiver to the transmitter.
- Format: X010 XXXX
- 1) Response for continue to correct (CTR) - This
- signal is the digital response to CTC signal, so that the receiving
- terminal can accept the contents included in CTC signal.
- Format: X010 0011
- A.4.3 Post message commands | (see also S 5.3.6.1.6)
- From the transmitter to the receiver.
- Format: X111 XXXX
- 1) Partial page signal (PPS) - This command indi-
- cates the end of a partial page or a complete page of facsimile
- information and also indicates to return to the beginning of
- phase B or C upon receipt of MCF.
- Format: X111 1101
- The frame construction of PPS command and transmission
- order of bits included in I1-I3 are shown in Figure A-1/T.30.
- Figure A-1/T.30, (N), p.
- 2) End of retransmission (EOR) - This command
- indicates that the transmitter decides to terminate the retransmis-
- sion of error frames in the previous partial page and to transmit
- the next block upon receipt of ERR response.
- Format: X111 0011
- The frame construction of EOR command is shown in
- Figure A-2/T.30.
- Figure A-2/T.30, (N), p.
- 3) Receive ready (RR) - This command is used to
- ask for the status of the receiver.
- Format: X111 0110
- Note 1 - This command is defined for flow control.
- Note 2 - For flow control method, make reference to S A.5.
- A.4.4 Post-message responses | (see also S 5.3.6.1.7)
- From the receiver to the transmitter.
- Format: X011 XXXX
- 1) Partial page request (PPR) - This signal indi-
- cates that the previous message has not been satisfactorily
- received and that the frames specified in the associated facsimile
- information field are required to be retransmitted.
- Format: X011 1101
- The facsimile information field of the PPR signal is a fixed
- length of 256 bits, each bit corresponds to an FCD frame i.e., the
- first bit to the first frame etc. For FCD frames which are received
- correctly, the corresponding bit in the PPR information field will
- be set to "0"; those that are received incorrectly or not received
- will have their bit set to "1".
- If more than one PPR signal is transmitted, the bit
- corresponding to an FCD frame which has been received correctly
- must always be set to "0".
- The frame construction of PPR response is shown in
- Figure A-3/T.30.
- The process of an error correction is shown in
- Figure A-4/T.30.
- Note 1 - The number of frames in a partial page is less than
- or equal to 256 frames. Therefore, in some circumstances there may
- be extra bits that do not correspond to any frames. These bits are
- set to "1" (see Figure A-5/T.30).
- Note 2 - The first bit in the FIF corresponds to the first
- frame (frame No. 0).
- 2) Receive not ready (RNR) - This signal is used
- to indicate that the receiver is not ready to receive more data.
- Format: X011 0111
- Note 1 - This signal is defined for flow control.
- Note 2 - For flow control, make reference to S A.5.
- 3) Response for end of retransmission (ERR) -
- This signal is the digital response to EOR signal.
- Format: X011 1000
- Figure A-3/T.30, (N), p.
- Figure A-4/T.30, (N), p.
- Figure A-5/T.30, (N), p.
- A.5 Flow control procedure
- A.5.1 Flow control in the transmitting station is made by con-
- tinuous flag transmission between frames or before the first frame.
- A.5.2 The maximum transmission time of flags should be less
- than the value of timer T1.
- A.5.3 In case of transmission on a noisy channel, a long flag
- sequence may be destroyed by noise. Therefore, it is recommended
- that the receiver implement a control procedure to discard invalid
- frames which are obtained from erroneous flag sequences.
- A.5.4 Flow control in the receiving station is made using
- RR/RNR signals as shown in Figure A-6/T.30.
- A.5.4.1 Inactivity timer T5 is defined as follows:
- T5 = 60 s _ 5 s.
- Note - As the use of the T5 timer reduces transmission effi-
- ciency, implementation which minimizes its effect is desirable.
- A.5.4.2 The timer T5 is started at the timing of the first RNR
- response recognition.
- A.5.4.3 If the timer T5 has expired, the transmitter sends a DCN
- command for call release.
- A.5.4.4 If RNR response is not received correctly, an RR command
- is retransmitted to the receiver. After three unsuccessful
- attempts, the transmitter sends a DCN command for call release.
- A.5.4.5 After receiving RNR response, the transmitter immediately
- sends an RR command until an MCF/PIP response or an ERR/PIN
- response is received correctly.
- A.5.4.6 An MCF or ERR response indicates that the busy condition
- is cleared and the receiver ready to receive the data which follows
- the interruption.
- Figure A-6/T.30, (N), p.6
- A.6 Procedure interrupt
- A.6.1 Procedure interrupt signals are not allowed at the par-
- tial page boundaries.
- A.6.2 Procedure interrupt after detection or transmission of
- PIP and PIN signals is accomplished by using the procedure defined
- in the main body of this Recommendation. This procedure is outside
- the scope of the error correction mode specified in this Annex A.
- A.7 Flow Diagrams
- The following flow diagrams shows the phase B, pre-message
- procedures, phase C, message procedure, phase D, post-message pro-
- cedures and phase E, call release, for both the transmitting and
- receiving stations.
- For the Notes and an explanation of terms to the flow
- diagrams, see S A.7.1.
- Figure A-7/T.30 (feuillet 1 sur 2), (N), p.7
- Figure A-7/T.30 (feuillet 1 sur 2), (N), p.8
- Figure A-7/T.30 (feuillet 2 sur 2), (N), p.9
- Figure A-7/T.30 (feuillet 2 sur 2), (N), p.10
- Figure A-8/T.30, (N), p.11
- Figure A-9/T.30, (N), p.12
- Figure A-10/T.30, (N), p.13
- Figure A-11/T.30, (N), p.14
- Figure A-12/T.30, (N), p.15
- Figure A-13/T.30, (N), p.16
- Figure A-14/T.30, (N), p.17
- Figure A-15/T.30, (N), p.18
- Figure A-16/T.30, (N), p.19
- Figure A-17/T.30, (N), p.20
- Figure A-18/T.30, (N), p.21
- Figure A-19/T.30, (N), p.22
- Figure A-20/T.30, (N), p.23
- Figure A-21/T.30, (N), p.24
- Figure A-22/T.30, (MC), p.25
- Figure A-23/T.30, (MC), p.26
- Figure A-24/T.30, (N), p.27
- Figure A-25/T.30, (N), p.28
- A.7.1 Flow diagram key
- COMMAND REC The "command received" subroutine searches for an
- error-free standard command. The decision diamonds in the flow
- diagram refer to the most recent standard command received
- (e.g., EOM, MPS, etc.). COMPT REMOTE REC The FIF associated with
- the DIS has indicated a "compatible remote receiver". DOC TO XMIT
- The station has "at least one document to be transmitted".
- COMPT REMOTE XMTR The FIF associated with the DIS has indicated a
- "compatible remote transmitter" which has documents to send.
- RESPONSE REC The "response received" subroutine which searches for
- an error-free standard response. LAST DOC The "last document", for
- the given operating mode, has been transmitted. SET MODE The sys-
- tem controller will "set the appropriate mode" of operation.
- 3RD TRY The command has been repeated three times without an
- appropriate response. CAPABLE RE-XMIT The transmitting station is
- "capable of retransmitting" a document which was not received with
- acceptable quality. MSG CARRIER REC The "message channel carrier
- has been received". This carrier is 1800 Hz for the Group 3 modula-
- tion scheme, and 1700 Hz for the Group 3 optional modulation
- scheme, 2100 Hz for the Group 2 modulations, and 1300-2100 Hz for
- the Group 1 modulation scheme.
- PHASE/TRAIN OK The phasing/training-TCF signal has been analyzed
- and the results of "phasing/training were OK". CHANGE MODE The
- transmitting unit desires to exit from the transmitting mode of
- operation and reestablish the capabilities. NSP REQ A
- "non-specified procedure" has been "recognized" by a unit compati-
- ble with the station initiating that procedure. COPY QUALITY OK By
- some algorithm, the "copy quality was deemed OK".
- REPHASE/TRAIN By some algorithm, it is deemed desirable to transmit
- a new phasing/training signal. FLAG There has been the detection
- of a "flag". RECEIVE A FRAME The unit has "received one complete
- HDLC frame". FCS ERROR The HDLC frame received contained an "FCS
- error".
- OPTIONAL RESPNS The HDLC frame received contained one of the listed
- "optional responses". OPTIONAL COMMAND The HDLC frame received
- contained one of the listed "optional commands". CRP OPTION The
- facsimile unit has the "CRP option" and can, therefore, request an
- immediate retransmission of the most recent command.
- LOCAL INT Either the "local" machine or the "local" operator wishes
- to generate an interrupt of the standard facsimile procedures. An
- operator would use this as a means to request the establishment of
- voice contact. LINE REQ This means that the local operator has
- "requested" that the telephone line be connected to the handset for
- voice contact with the remote end. PRI-Q A general term referring
- to either PRI-EOM, a PRI-MPS, or a PRI-EOP post-message command,
- i.e., the fifth bit of the standard post-message command is set
- to 1. END OF PAGE? The transmitting station may have further data
- to transmit to complete the page.
- 4TH PPR? PPR has been received 4 times. TRANSMIT ERROR FRAMES The
- frames defined in the information field associated with PPR are
- transmitted using the V.27 | fIter /V.29 modulation system.
- CONTINUE TO CORRECT? The transmitting station by some algorithm
- decides to continue correcting the previous message.
- CONT WITH NEXT MSG? The transmitting station by some algorithm
- decides to continue and transmit the next message. The previous
- message was not satisfactorily transmitted.
- PPSxPRI-Q? The terminal has "received either PPSxPRI-EOM,
- PPSxPRI-MPS, or PPSxPRI-EOP post-message command". PPSxQ? The
- terminal has "received either PPSxEOM, PPSxMPS, PPSxEOP or PPSxNull
- post-message command." EORxPRI-Q? The terminal has "received
- either EORxPRI-EOM, EORxPRI-MPS, or EORxPRI-EOP post-message com-
- mand." EORxQ? The terminal has "received either EORxEOM, EORxMPS,
- EORxEOP or EORxNull post-message command".
- RECEIVE READY? The receiving station is ready to receive the next
- message. RR RESPONSE REC? The "RR response received" subroutine
- searches for an error-free response for the RR command.
- CTC RESPONSE REC? The "CTC response received" subroutine searches
- for an error-free response for the CTC command.
- Note 1 - The non-specified procedure, NSP, refers to a pro-
- cedure which takes 6 seconds or less to complete. It may not neces-
- sarily be a definable signal sequence.
- Note 2 - This signal pertains to Group 3 apparatus only.
- Note 3 - The PRI-EOM, PRI-EOP, PRI-MPS post-message commands
- are sent when a local interrupt request is pending.
- Note 4 - At any time during the operation an interrupt may be
- generated which would result in a procedural interrupt. It is
- understood that if this interrupt happens during the transmission
- of the document, the EOM/RTC signal will be transmitted prior to
- invoking the procedural interrupt.
- Note 5 - Where the symbol / is used, the term to the left of
- the symbol refers to Groups 1 and 2 equipment, and the term to the
- right of the symbol refers to Group 3 equipment.
- Note 6 - Where the symbols { } are used, the signals within
- these symbols are a response to DIS from the calling unit wishing
- to receive.
- Note 7 - Where the symbols ( ) are used, the signals within
- these symbols are optional.
- A.8 Signal sequence examples in case of error correction
- procedure
- The examples below are based on the flow diagrams and for
- illustrative and instructional purposes only. They should not be
- interpreted as establishing or limiting the protocol. The exchange
- of the various commands and responses is limited only by the rules
- specified in this Recommendation.
- In these diagrams the dashed lines indicate transmission at
- the message data rate (Recommendation V.27 | fIter , V.29), and (X,
- Y) means (page modulo number, block modulo number).
- Blanc
- Figure A-26/T.30 (feuillet 1 sur 13), (N), p.
- Figure A-26/T.30 (feuillet 2 sur 13), (N), p.30
- Figure A-26/T.30 (feuillet 3 sur 13), (N), p.31
- Figure A-26/T.30 (feuillet 4 sur 13), (N), p.32
- Figure A-26/T.30 (feuillet 5 sur 13), (N), p.33
- Figure A-26/T.30 (feuillet 6 sur 13), (N), p.34
- Figure A-26/T.30 (feuillet 7 sur 13), (N), p.35
- Figure A-26/T.30 (feuillet 8 sur 13), (N), p.36
- Figure A-26/T.30 (feuillet 9 sur 13), (N), p.37
- Figure A-26/T.30 (feuillet 10 sur 13), (N), p.38
- Figure A-26/T.30 (feuillet 11 sur 13), (N), p.39
- Figure A-26/T.30 (feuillet 12 sur 13), (N), p.40
- Figure A-26/T.30 (feuillet 13 sur 13), (N), p.41
- APPENDIX I
- (to Recommendation T.30)
- Example of non-standard manual-to-manual basic facsimile
- operation
- It is acknowledged that there are existing equipments in the
- field that may not conform in all aspects to this Recommendation.
- Therefore, the decision may be made to go to a mode of operation
- other than specified herein. Figure I-1/T.30 describes, as an exam-
- ple, one of these conditions. Other methods may be possible as
- long as they do not interfere with the recommended operation.
- FIGURE I-1/T.30, (M), p.42
- APPENDIX II
- (to Recommendation T.30)
- H.T. [1T13.30]
- Index of abbreviations used in Recommendation T.30
- __________________________________________________________________________________________________________________________
- Abbreviation Function Signal format Reference
- __________________________________________________________________________________________________________________________
- CED Called station identification 2100 Hz 4.3.3.2
- CFR Confirmation to receive X010 0001 5.3.6.1.4, 1)
- 1850 or 1650 Hz for 3s 4.3.1.2
- CRP Command repeat X101 1000 5.3.6.1.8, 2)
- CIG {
- Calling subscriber identification
- } 1000 0010 5.3.6.1.2, 2)
- CNG Calling tone 1100 Hz for 500 ms 4.3.3.3
- CSI {
- Called subscriber identification
- } 0000 0010 5.3.6.1.1, 2)
- CTC Continue to correct X100 1000 A.4.1
- CTR {
- Response to continue to correct
- } X010 0011 A.4.2
- DCN Disconnect X101 1111 5.3.6.1.8, 1)
- DCS Digital command signal X100 0001 5.3.6.1.3, 1)
- DIS Digital identification signal 0000 0001 5.3.6.1.1, 1)
- DTC Digital transmit command 1000 0001 5.3.6.1.2, 1)
- EOM End of message X111 0001 1100 Hz 5.3.6.1.6, 1) 4.3.2.4
- EOP End of procedure X111 0100 5.3.6.1.6, 3)
- EOR End of retransmission X111 0011 A.4.3
- ERR {
- Response for end of retransmission
- } X011 1000 A.4.4
- FCD Facsimile coded date 0110 0000 A.2.2
- FCF Facsimile control field - 5.3.6.1
- FIF Facsimile informtion field - 5.3.6.2
- FTT Failure to train X010 0010 5.3.6.1.4, 2)
- GC Group command 1300 Hz for 1.5-10.0 s 4.3.2.1
- 2100 Hz for 1.5-10.0 s
- GI Group identification 1650 or 1850 Hz 4.3.1.1
- HDLC High level data link control - 5.3
- LCS Line conditioning signals 1100 Hz 4.3.2.2
- MCF Message confirmation X011 0001 1650 or 1850 Hz 4.3.1.3
- MPS Multi-page signal X111 0010 5.3.6.1.6, 2)
- NSC {
- Non-standard facilities command
- } 1000 0100 5.3.6.1.2, 3)
- NSF Non-standard facilities 0000 0100 5.3.6.1.1, 3)
- NSS Non-standard set-up X100 0100 5.3.6.1.3, 3)
- __________________________________________________________________________________________________________________________
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- TABLEAU II-1/T.30 [1T13.30], p.43
- BLANC
- H.T. [2T13.30]
- Index of abbreviations used in Recommendation T.30
- (end)
- ___________________________________________________________________________________________________________
- Abbreviation Function Signal format Reference
- ___________________________________________________________________________________________________________
- PIN Procedural interrupt negative X011 0100 5.3.6.1.7, 5)
- PIP Procedural interrupt positive X011 0101 5.3.6.1.7, 4)
- PIS Procedure interrupt signal 462 Hz for 3 s 4.3.3.1
- PPS Partial page signal X111 1101 A.4.3
- PPR Partial page request X011 1101 A.4.4
- PRI-EOM Procedure interrupt-EOM X111 1001 5.3.6.1.6, 4)
- PRI-EOP Procedure interrupt-EOP X111 1100 5.3.6.1.6, 6)
- PRI-MPS Procedure interrupt-MPS X111 1010 5.3.6.1.6, 5)
- RCP {
- Return to control for partial page
- } 0110 0001 A.2.2
- RNR Receive not ready X011 0111 A.4.4
- RR Receive ready X111 0110 A.4.3
- RTN Retrain negative X011 0010 5.3.6.1.7, 3)
- RTP Retrain positive X011 0011 5.3.6.1.7, 2)
- TCF Training check Zeros for 1.5 s 5.3.6.1.3, 4)
- TSI {
- Transmitting subscriber identification
- } X100 0010 5.3.6.1.3, 2)
- ___________________________________________________________________________________________________________
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- TABLEAU II-1/T.30 [2T13.30], p.44
- BLANC
- APPENDIX III
- (to Recommendation T.30)
- H.T. [1T14.30]
- List of commands and appropriate responses
- _____________________________________________________________________________________________________________
- Commands Comments Appropriate responses
- _____________________________________________________________________________________________________________
- (NSF) (CSI) DIS {
- Identifying capabilities:
- from a manual receiver or an auto answer
- unit.
- } {
- (NSC) (CIG) DTC
- (TSI) DCS
- (NSF) (CSI) DIS
- (CRP) (TSI) (NSS)
- }
- _____________________________________________________________________________________________________________
- (NSC) (CIG) DTC {
- Mode setting command:
- from the calling unit.
- This is
- a poll operation.
- } {
- (TSI) DCS
- (NSF) (CSI) DIS
- (CRP) (TSI) (NSS)
- }
- _____________________________________________________________________________________________________________
- (TSI) DCS (TSI) (NSS) {
- Mode setting command:
- from manual transmitter or automatic
- receiver.
- This command is always followed by phasing/training.
- } {
- CFR
- FTT
- (NSC) (CIG) DTC
- (NSF) (CSI) DIS
- (CRP)
- }
- _____________________________________________________________________________________________________________
- CTC {
- Mode setting command:
- from the transmitter to the receiver.
- } (CTR) (CRP)
- _____________________________________________________________________________________________________________
- (EORxNULL) {
- Indicate the next block transmission:
- from the transmitter
- to the receiver.
- } (ERR) (RNR) (CRP)
- _____________________________________________________________________________________________________________
- {
- (EORxMPS) or
- (EORxEOP) or
- (EORxEOM) or
- (EORxPRIxMPS) or
- (EORxPRI-EOP) or
- (EORxPRI-EOM)
- } {
- Indicate the next message transmission:
- from the transmitter to
- the receiver.
- } (ERR) (RNR) PIN (CRP)
- _____________________________________________________________________________________________________________
- {
- MPS or EOP or EOM or
- (PRI-MPS) or
- (PRI-EOP) or
- (PRI-EOM)
- } Post message commands. MCF RTP RTN PIP PIN (CRP)
- _____________________________________________________________________________________________________________
- (PPSxNULL) {
- Post-message command for a partial page:
- from the transmitter
- to the receiver.
- } (PPR) MCF (RNR) (CRP)
- _____________________________________________________________________________________________________________
- {
- (PPSxMPS) or
- (PPSxEOP) or
- (PPSxEOM) or
- (PPSxPRI-MPS) or
- (PPSxPRI-EOP) or
- (PPSxPRI-EOM)
- } {
- Post-message commands for a complete page:
- from the
- transmitter to the receiver.
- } {
- (PPR)
- MCF
- (RNR)
- PIP
- PIN
- (CRP)
- }
- _____________________________________________________________________________________________________________
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- TABLEAU III-1/T.30 [1T14.30], p.45
- H.T. [2T14.30]
- List of commands and appropriate responses
- (end)
- ________________________________________________________________________________
- Commands Comments Appropriate responses
- ________________________________________________________________________________
- (RR) {
- Ask for the status of the receiver:
- from the transmitter to
- the receiver.
- } {
- (RNR)
- (ERR)
- MCF
- PIP
- PIN
- (CRP)
- }
- ________________________________________________________________________________
- DCN Phase E command None
- ________________________________________________________________________________
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- Note - Where the symbols ( | are used, the signals within these
- symbols are optional.
- TABLEAU III-1/T.30 [2T14.30], p.46
- APPENDIX IV
- (to Recommendation T.30)
- Interworking between the standard mode
- and the recognized optional mode for the binary coded
- handshaking procedure
- An example of a station having the standard binary coded,
- recognized optional binary coded and tonal capabilities is given in
- Figure IV-1/T.30.
- Figure IV-1/T.30, (MC), p.47
- APPENDIX V
- (to Recommendation T.30)
- Signal sequence examples
- The examples below are based on the flow diagrams and are for
- illustrative and instructional purpose only. They should not be
- interpreted as establishing or limiting the protocol. The exchange
- of the various commands and responses is limited only by the rules
- specified in this Recommendation. (See SS 5.3 and 5.4).
- The notations used in these diagrams are as follows:
- - an arrowhead signifies the receiver of the sig-
- nal;
- - a solid line indicates transmission of the sig-
- nal at the data rate of 300 bit/s;
- - the dashed lines indicate transmission at the
- message data rate (Recommendations V.27 | fIter , V.29);
- - a lightning bolt ( ) indicates an invalid frame;
- - a bold solid line indicates the transmission of
- tonal signals.
- In the following figures, the examples given assume that DIS
- will be repeated for T1 seconds unless responded by a valid signal.
- Figure V-1/T.30, (MC), p.
- Figure V-2/T.30, (MC), p.49
- Figure V-3/T.30, (MC), p.50
- Figure V-4/T.30, (MC), p.51
- Figure V-5/T.30, (MC), p.52
- Figure V-6/T.30, (MC), p.53
- Figure V-7/T.30, (MC), p.54
- Figure V-8/T.30, (MC), p.55
- Figure V-9/T.30, (MC), p.56
- Figure V-10/T.30, (MC), p.57
- Figure V-11/T.30, (MC), p.58
- Figure V-12/T.30, (MC), p.59
