(DRAFT) PERSONAL DIGITAL CELLULAR TELECOMMUNICATION SYSTEM ARIB STANDARD

Transcription

1 (DRAFT) EGLISH TRASLATIO PERSOAL DIGITAL CELLULAR TELECOMMUICATIO SSTEM ARIB STADARD RCR STD-27 L Fascicle 3 ISSUED REVISIO A REVISIO B REVISIO C REVISIO D REVISIO E REVISIO F REVISIO G REVISIO H REVISIO I REVISIO I-1 REVISIO J REVISIO K REVISIO L A P R I L JAUAR DECEMBER OVEMBER J U E SEPTEMBER FEBRUAR M A FEBRUAR J U L M A R C H M A J U L OVEMBER 30, , , , , , , , , , , , , , 2005 Association of Radio Industries and Businesses

2 General otes to the English translation of ARIB Standards and Technical Reports 1. The copyright of this document is ascribed to the Association of Radio Industries and Businesses (ARIB). 2. All rights reserved. o part of this document may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, without the prior written permission of ARIB. 3. The ARIB Standards and ARIB Technical Reports are usually written in Japanese and approved by the ARIB Standard Assembly. This document is a translation into English of the approved document for the purpose of convenience of users. If there are any discrepancies in the content, expressions, etc., between the Japanese original and this translated document, the Japanese original shall prevail. 4. The establishment, revision and abolishment of ARIB Standards and Technical Reports are approved at the ARIB Standard Assembly, which meets several times a year. Approved ARIB Standards and Technical Reports, in their original language, are made publicly available in hard copy, CDs or through web posting, generally in about one month after the date of approval. The original document of this translation may have been further revised and therefore users are encouraged to check the latest version at an appropriate page under the following URL: 5. The original "Personal Digital Cellular Telecommunication System (RCR STD-27L)" is written in Japanese and has been approved by the 60th Standard Assembly Meeting (ovember 30, 2005). 6. The note about IPR (Industrial Property Rights) in the ITRODUCTIO of Fascicle 1 of the Standard applies to the use of Essential IPR for the ARIB Standard in Japan. If the ARIB Standard is adopted outside Japan, Essential IPR will be treated in accordance with policies stated by each IPR owner. The IPR owners are, however, expected to apply the rules of the preface of the "Guidelines for Treatment of Industrial Property Rights in connection with the ARIB Standard" (September 5, 1995, approved by the 1st Standard Assembly Meeting). In the preface of the Guidelines, it is stated that it is "desirable that the Essential IPR which relates to any or all parts of the contents of the ARIB Standard should be used free of charge by anyone and that it would not block the use of such Essential IPR in any other country where such an ARIB Standard is adopted".

3 COTETS Fascicle 3 Annex 1 Annex 2 Annex 3 Annex 4 Annex 5 Annex 6 Authentication, Ciphering and Subscriber Data Registration Standard for the Personal Digital Cellular Telecommunication System Data Transmission Standard for the Personal Digital Cellular Telecommunication System (G3 facsimile and modem (V.42 AEX)) High Speed Data Transmission Standard for the Personal Digital Cellular Telecommunication System Standard for Interface between Mobile Station and Subscriber Information Module Half-duplex packet communications standard for the Personal digital cellular telecommunication System Standard for the Radio Interface of the Wireless Local Loop System Attachment Amendment History of RCR STD-27 i

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5 Annex 1 Authentication, Ciphering and Subscriber Data Registration Standard for the Personal Digital Cellular Telecommunication System ote: Disclosure of this standard is specified in accordance with the "Disclosure Regulation on the Standard for Authentication, Ciphering and Subscriber Data Registration of the Personal Digital Cellular Telecommunication System" and the "Exceptional Disclosure Regulation on the Standard for Authentication, Ciphering and Subscriber Data Registration of the Personal Digital Cellular Telecommunication System" approved in the Standard Assembly. Annex 1-1

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7 Annex 2 Data Transmission Standard for the PersonalDigital Cellular Telecommunication System ( G3 facsimile and modem (V.42 AEX) ) RCR STD-27

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9 COTETS Annex 2 Page 1. General Overview System configuration Activation and deactivation procedures Activation procedures Activation types Activation procedures on the mobile station side Connection procedures on the network side Deactivation procedures Deactivation types Deactivation procedures on the mobile station side Deactivation procedures on the network side G3 facsimile communication procedures Communications procedures Pre-message procedure (Phase B) Transmission on the originating side Reception on the originating side Semi-normal processing Image signal transfer (Phase C) Post-message procedure (Phase D) End-of-procedure control (EOP) Multi-page control (MPS) End-of-message control (EOM) Semi-normal processing... 4 Annex 2-i

10 3.5 List of thresholds Error control Frame structure Frame structure Bit transmission order ARQ protocol Synchronization establishment control Data transmission control Data reception control... 5 G3 fascimile communications charts and graphs (Figs. 1.2 ~ (3))... 6 ~ V.42 AEX modem communication procedures Communication procedures Physical connection procedures ormal sequence Semi-normal sequence Protocol establishment procedures ormal sequence Semi-normal sequence Disconnection procedure ormal sequence Semi-normal sequence Error control Frame structure Synchronization control V.42 AEX modem communication charts and graphs (Figs. 4.1 ~ ) ~ 124 Annex 2-ii

11 5. G3 facsimile ECM communication procedure Outline of communication procedure Pre-message procedure (Phase B) Transmission procedure on the originating side Reception procedure on the originating side Image signal transmission (Phase C) Post-message procedure (Phase D) Block end control Multi-page control Procedure end control Message end control Retransmission end procedure Appendix I Setting method for parameter RTF in the ARQ procedure (Fig. 5.2.T.B.1 ~ Fig R.D.4) ~ 158 Annex 2-iii

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13 1. General 1.1 Overview This standard specifies G3 facsimile and modem (V.42 Annex) communications in the Digital Cellular Telecommunication System. 1.2 System configuration Data communication services to be offered in the Digital Cellular Telecommunication System, which include G3 facsimile communications and modem communications, are provided by connecting data communication units to mobile stations and switches respectively. The basic system configuration for these data communication services is shown in Fig Since ARQ is performed for facsimile communications, controls are needed to prevent the switch-side data communication units from getting switched during channel handover. Annex 2-1

14 2. Activation and deactivation procedures 2.1 Activation procedures Activation types The activation types for a data communication unit are listed in Table When activation type 1 is used, the data communication mode can be triggered either by setting the terminal (G3 facsimile terminal or modem-equipped data terminal) "OFF-HOOK" or by operating the mobile station (handset etc.) Activation procedures on the mobile station side The activation sequence for each activation type is shown in Figs (1) to (5). The initial operation flow of a G3 fax in each activation sequence is shown in Fig In contrast, no specific initial operation flow is set for a modem. IFO (CR,FI (terminal, active)) can be monitored by starting a timer after transmission of IFO (CR, FA (terminal)), where the terminal is either G3FAX or MODEM. However, IFO(CR, FA (terminal)) is not retransmitted on timer expiry. The communication path is not switched on reception of IFO (CR, FI (terminal, non-active)) Activation procedures on the network side The network always switches to facsimile communications (1) after the originating or terminating sequence has been completed and (2) after the TCH has been established and (3) IFO(CR, FA (terminal)) is received from the MS. This procedure applies to all of the activation types. The activation sequence used for data communications on the network side is shown in Fig The initial operation flow of a facsimile unit is the same as that used on the mobile station side. (See Fig ) 2.2 Deactivation procedures Deactivation types The types of deactivation for a data communication unit are listed in Table Deactivation procedures on the mobile station side The deactivation sequence used for each deactivation type is shown in Figs (1) to (4) Deactivation procedures on the network side The deactivation sequence used for each deactivation type is shown in Figs (1) and (2). Annex 2-2

15 3. G3 facsimile communication procedures 3.1 Communication procedures G3 facsimile communications procedures are shown in Fig G3 facsimile communication procedures consist of the activation procedure (Phase A), the pre-message procedure (Phase B), the image signal transmission procedure (Phase C), the post-message procedure (Phase D) and the deactivation procedure (Phase E). Phases B, C and D are based on the ITU-T T.30 recommendation. The activation and deactivation procedures are the same as for modem communications and are shown in Chapter 2. Details of each procedure are shown in the following sections. 3.2 Pre-message procedure (Phase B) Transmission on the activating side The pre-message procedure for transmission from the activating side is shown in Fig Details of this procedure are as follows. Fig shows the output conditions for "TCF Error Detection", while Fig shows the selection algorithm for CFR//CRP/FTT. Fig shows the output conditions for FTT and the specified rate decision algorithm for DCS. Fig shows the interval length decision algorithm for the TCF pre-message response signal. Fig shows the preamble length decision algorithm for the pre-message response signal. Fig shows the air interface quality estimation method Reception on the activating side The pre-message procedure for reception on the activating side is shown in Fig Semi-normal processing Semi-normal processing procedures are shown in Figs to The stand-by method for both V.21 and V.27ter modems is shown in Fig Image signal transmission (Phase C) The image signal transmission procedure is shown in Fig The fill insertion control algorithm used for the image signal memory in the reception unit and the control algorithm when no image signal exists for transmission are shown in Figs and 3.3.3, respectively. Details of the ARQ control for the image signal are given in section 3.6. Annex 2-3

16 3.4 Post-message procedure (Phase D) End-of-procedure control (EOP) The basic sequence for the end-of-procedure is shown in Fig Fig shows the sequence when the response to EOP is RTP or RT. Fig shows the sequence for PRI-EOP. Fig shows the sequence when the response to EOP is PIP or PI Multi-page signal (MPS) The basic sequence used for the multi-page signal (MPS) is shown in Fig Fig shows the sequence used when the response to MPS is RTP or RT. Fig shows the sequence for PRI-MPS. Fig shows the sequence used when the response to MPS is PIP or PI End-of-message control (EOM) The basic sequence for the end-of-message control (EOM) is shown in Fig The algorithm for EOM response selection is shown in Fig The sequence for reception on the activating side after EOM is shown in Fig Fig shows the sequence when the response to EOM is RTP or RT. Fig shows the sequence for PRI-EOM. Fig shows the sequence when the response to EOM is PIP or PI Semi-normal processing Semi-normal processing procedures are shown in Figs to List of threshold values Various threshold values used in the sequences are listed in Table Error control Frame structure Frame structure One frame consists of one TCH burst (224 bits). The frame structure is shown in Fig Signals used for the air interface are listed in Table Bit transmission order Backward channel control information and forward channel control information transmission order Annex 2-4

17 Control information from the backward and forward channels is transmitted from the MSB of the control information with b7 at the top to the frame and the CRC encoder. (See Fig ) Forward channel information transmission order Image signals The input bits from the line side are divided into bytes sequentially from the first input bit through successive bits and they are written in the Pix accumulation memory beginning with the LSB. Following this, with the progress of ARQ, the written data is transmitted in bytes from the MSB of the Pix accumulation memory to the frames or CRC encoder with b191 at the top. (See Fig ) Procedure signals (i) Procedure signals received from FAX: The HDLC signals received from the line side are transmitted to the frame and the CRC encoder in the order LI, A, C, FCF, (FIF) for each parameter from the MSB with b191 at the top. (See Fig ) (ii) Procedure signals defined in the air interface: In the same manner as above, signals are transmitted to the frame and the CRC encoder in the order LI, A, C, FCF (definition signal) for each parameter from the MSB with b191 at the top. (See Fig ) Transmission order of CRC bits to frames Output (i.e., the results of the operation for all the 208 bits of the above information) from the CRC encoder is sent to the frames sequentially from the first output bit through successive bits with b15 at the top. (See Fig ) ARQ protocol Synchronization establishment control The flow diagram for establishing synchronization on the transmission side is shown in Fig The flow diagram for establishing synchronization on the reception side is shown in Fig Data transmission control The control parameter on the transmission side is shown in Fig The data transmission control sequence is shown in Figs (1) to (4) Data reception control The control parameters on the reception side are shown in Fig The data reception control sequence is shown in Figs (1) to (3). Annex 2-5

18 Terminal Mobile station (incl. data communication unit) Base station Switch (incl. data communication unit) Public network Fig. 1.2: System configuration Annex 2-6

19 Table : Activation types for data communication units Activation type Condition of MS handset Switches to data communication during call in progress by MS TEL. OFF-HOOK Origination from data terminal (automatic origination) O-HOOK Termination on data terminal (automatic termination) Annex 2-7

20 Terminal MS (including data communication unit) Call in progress OFF-HOOK IFO (CR, FA(terminal)) IFO (CR, FI(terminal, active)) Switch the path from codec to data communication unit Send 224 bit signals all set to "1" to the air interface(tch-t). (These signals are idle pattern data, not required for detection by the unit at network side) o signal is sent to the terminal Initial operation* * See Fig , for G3 fax. Enter directly to data communication for modem. ote erminal is G3 fax or modem. Initial operation should be done quickly after switching the communication path Fig (1) : Activation sequence for the data communication unit on the MS side (when switching to data communication by setting the terminal to OFF-HOOK - activation type 1) Annex 2-8

21 Terminal MS (including data communication unit) Call in progress Data communication request detected IFO (CR, FA(terminal)) IFO (CR, FI(terminal, active)) OFF-HOOK Switch the path from codec to data communication unit Send 224 bit signals all set to "1" to the air interface (TCH-T). (These signals are idle pattern data, not required for detection by the unit on the network side) o signal is sent to the terminal Initial operation Fig (2) Activation sequence for the data unit on the MS side (when switching to data communication by operating the handset, etc. - activation type 1) Annex 2-9

22 Terminal MS (including data communication unit) OFF-HOOK Dialing Call originating sequence IFO (CR, FA (terminal)) IFO (CR, FI (terminal, active)) Switch the path from codec to data communication unit Send 224 bit signals all set to "1" to the air interface (TCH-T). (These signals are idle pattern data, not required for detection by the unit on the network side) o signal is sent to the terminal Initial operation Fig (3) : Activation sequence for the data communication unit on the MS side (activation type 2) Annex 2-10

23 Terminal MS (including data communication unit) OFF-HOOK RGT Call terminating sequence IFO (CR, FA (terminal)) IFO (CR, FI (terminal, active)) Switch the path from codec to data communication unit Send 224 bit signals all set to "1" to the air interface (TCH-T). (These signals are idle pattern data, not required for detection by the unit on the network side) o signal is sent to the terminal side Initial operation Fig (4) : Activation sequence for the data communication unit on the MS side (activation type 3) Annex 2-11

24 Terminal MS (including data communication unit) IFO (CR, FA (terminal)) IFO (CR, FI (terminal, non-active)) Call in progress Fig (5) : Activation sequence for the data communication unit on the MS side (on reception of "O-ACTIVE") Annex 2-12

25 Start * Start ARQ synchronization establishment * Start preamble reception received? Set preamble reception flag O ARQ synchronization established? reception flag O? Execute reception side operation received? CED Start received from reception side? Execute transmission side operation Fig : Initial operation flow for a facsimile unit Annex 2-13

26 W (including data communication unit) IFO (CR, FA (terminal)) Supported? IFO (CR, FI (terminal, non-active)) Switch the path from codec to data communication unit G3 fax unit: Start transmitting ARQ establishment signals to the air interface (TCH-T) Modem unit: Transmit 224 bit signals all set to "1" to the air interface o signal is transmitted to the fixed network user side IFO (CR, FI (terminal, active)) Initial operation* * See Fig , for G3 fax. Enter directly to data communication for modem. Fig : Activation sequence for data communication on the network side Annex 2-14

27 Table : Deactivation types for a data communication unit on the MS side Deactivation type Setting to O-HOOK on MS data terminal 1 2 Setting to O-HOOK on fixed network data terminal Annex 2-15

28 Terminal MS (including data communication unit) Phase D postmessage procedure Phase D postmessage procedure IFO (CR, FA (terminal)) O-HOOK Switch the path from data communication unit to codec IFO (CR, FI (terminal, non-active)) Call in progress Fig (1) : Deactivation sequence for the data communication unit on the MS side (deactivation type 1) Annex 2-16

29 Terminal MS (including data communication unit) Data communication DISC End-of-call sequence O-HOOK Switch the path from data communication unit to codec Fig (2) : Deactivation sequence for the data communication unit on the MS side (deactivation type 2) Annex 2-17

30 Terminal MS (including data communication unit) Data communication O-HOOK IFO (CR, FA (terminal)) Switch the path from data communication unit to codec IFO (CR, FI (terminal, non-active)) Call in progress Fig (3) : Deactivation sequence for the data communication unit on the MS side (When the data terminal is "set to O-HOOK" during data communication) Annex 2-18

31 Terminal MS (including data communication unit) Data communication Communication end REQ detected IFO (CR, FA (terminal)) O-HOOK Switch the path from data communication unit to codec IFO (CR, FI (terminal, non-active)) Call in progress Fig (4) : Deactivation sequence for the data communication unit on the MS side (When data communication is ended by operating the handset, etc., during data communication) Annex 2-19

32 W (including data communication unit) Data communication IFO (CR, FA (terminal)) IFO (CR, FI (terminal, non-active)) Switch the path from data communication unit to codec Call in progress Fig (1) : Deactivation sequence for data communications on the network side (Deactivation type 1) Annex 2-20

33 W (including data communication unit) Data communication OHOOK End of call sequence Release data communication unit Fig (2) : Deactivation sequence for data communications on the network side (Deactivation type 2) Annex 2-21

34 Start Activation procedure Phase A Pre-message procedure Phase B Image signal transmission procedure Phase C Post-message procedure Phase D Deactivation procedure Phase E End Fig : G3 facsimile communication procedures Annex 2-22

35 FAX 1 UIT 1 CED start UIT 2 FAX 2 T R CSI, DIS CED 75ms 2.7s 1.0 ~ 2.5s Removes V.33 and V.29 indication bits TSI, DCS Training o Transmits CSI and DIS only (removing SF) o Removes V.33 and V.29 indication bits. o removes ECM indication bit. CSI, DIS Transmits preamble 75ms after transmission of CED. On reception of DIS, transmits a DIS after transmission of preamble stops (the preamble length is minimum 1.0s.) If DIS is not received within 2.5s, stops transmission of preamble. If DCS has previously been received on reception of DIS, transmits preamble for 1.0s and DCS 75 ms after reception of DIS. If DCS has not been received, transmits preamble for 1.0s after a 0.5s interval following reception of DIS. After transmission of preamble, if a DCS has been received transmits a DCS, and if it has not been received, transmits CRP. When the V.29 indication bit is O, TCF with error is sent until a transmission rate becomes 4.8 kbps. At the same time reduces the specified TX rate one rank and retransmits a DCS. (Refer to Fig ) TSI, DCS SF, CSI, DIS Transmits preambles 0.5s after reception of DIS. 0.5s 1.0s CRP Transmits CRP since DCS has not been received. 1.0s 75ms SF, CSI, DIS If DIS has already been transmitted to the radio end, the received DIS is not retransmitted. TSI, DCS 0.2s TCF 0.8s Error detection segment TCF Error Detection Training (match with the modem type) 2.4s See Fig If a TCF Error Detection has been received, TCF with error is sent. 1.5s TCF CFR 2.5s See Fig CFR is not transmitted to the air interface. CFR//CRP/FTT (Refer to fig ) 75ms ~ 4.9s Training Pix Pix When Pix is received within 75ms after reception of CFR, transmits a training 75ms after receptionof CFR. If a Pix is not received within 4.9s, retransmits DCS-TCF. Training (matching with the modem type) Pix Fig : Pre-message procedure (Transmission from the activating side) Annex 2-23

36 Start Errors in TCF detected? TX rate specified by DCS 2.4 kbps? TX rate specified by DCS is faster than quality estimation value* for air interface? "TCF Error Detection" already transmitted to radio end by DCS with same TX rate? Output "TCF Error Detection" to radio end Increase TCF error detection counter End * Air interface quality estimation method is shown in Fig Fig : Output conditions for "TCF Error Detection" Annex 2-24

37 Start Increment Pre-message response counter BF in backward channel control information O or transmission side unit busy? TCF error detection counter 1? Output FTT Set the FTT-received flag to "OFF" Premessage response counter =3? Output CRP FTT already received from air interface? 1 FTT already received from air interface? Output CFR Set the FTT-received flag to "OFF" Pre-message response counter = 3? Output CRP Output FTT Output FTT 1 Output FTT? Pre-message response counter = 0 TCF error detection counter 0? Decrement TCF error detection counter OTE: "FTT-received flag" shall be set to "O" when "FTT" is received from the air interface. End Fig : Selection algorithm for CFR//CRP/FTT Annex 2-25

38 Start DIS/DTC received? FTT received? CRP received? CRC error? T4(=3.6s) expired? Output FTT to the air interface Retransfer previously transmitted DCS TX rate specified for previously transmitted DCS 2.4 kbps? Drop specified TX rate one rank and retransfer DCS CFR received? TCF Error Detection received? DCS with same specified TX rate already transmitted 3 times? Output DC, after transmitting preamble for 1.0s. OFF REQ for MS unit TCF Error Detection received? Retransfer previously transmitted DCS Is TX rate specified for previously transmitted DCS 2.4 kbps? Drop specified TX rate one rank and retransfer DCS Retransfer previously transmitted DCS End ote: "TCF error detection received" is a flag. Fig : Output conditions for FTT and specified TX rate decision algorithm for DCS Annex 2-26

39 Start Interval after first TCF in Phase B? Unit 1 or 2 busy? Set interval between TCF and pre-message response signal to 75 ms. Set interval between TCF and pre-message response signal to 2.4s. End Fig : Interval length decision algorithm for TCF pre-message response signal Start for 1st pre-message response signal in Phase B? Unit 1 or 2 busy? Set preamble for pre-message response signal to 1.0s. Set preamble for pre-message response signal to 2.5s. End Fig : length decision algorithm for pre-message response signal Annex 2-27

40 Start Count the number of error frames "e" for the last 5s according to the results of frame error detection by CRC. TCF received? e a*? Judge quality drop for air interface * "a" refers to the number of permissible error frames. Fig : Air interface quality estimation method Annex 2-28

41 FAX 1 UIT 1 UIT 2 FAX 2 CED Start T R 2.7s Transmits CSI and DIS only (removing SF) Removes V.33 and V.29 indication bits. Removes ECM indication bit. SF, CSI, DIS CED CSI, DIS 75ms Transmits preamble 75ms after transmission of CED. On reception of DIS, transmits DIS after transmission of preamble stops (preamble length is at least 1.0s.) If DIS is not received within 2.5s, stops transmission of preamble. Removes ECM indication bit. 0.5s 1.0s 1.0 ~ 2.5s CRP CSI, DIS CIG, DTC CSI, DIS Transmits CIG, DTC/CSI, DIS only (removing SC/SF) Removes V.33 and V.29 indication bits. Removes ECM indication bit. R If DTC/DIS have already been received on reception of DIS, transmits preamble for 1.0s. and DTC/DIS 75ms after reception of DIS. If DTC/DIS have not been received, transmits preamble for 1.0s, after 0.5s. following reception of DIS. If DTC/DIS have been received after transmission of preamble for 1.0s, transmits DTC/DIS. If they have not been received, transmits CRP. Removes ECM indication bit. CIG, DTC /CSI, DIS T SF, CSI, DIS If DIS has already been transmitted to the air interface, the received DIS is not transmitted. 1.0s CIG, DTC/CSI, DIS Fig : Pre-message procedure (reception on the activating side) Annex 2-29

42 FAX 1 UIT 1 UIT 2 FAX 2 T CED Start R CED 2.7s SF, CSI, DIS X X 75ms 0.5s 1.0 ~ 2.5s 1.0s Since DIS is not received within 2.5s after transmission of preamble, stops transmission of preamble. CRP 200ms Restarts transmission of preamble 200ms later. 1.0s CSI, DIS SF, CSI, DIS CSI, DIS If DIS is received within 1.0s after transmission of preamble, transmits preamble for 1.0s, then transmits DIS. If DIS is received within 2.5s, transmits DIS immediately. 0.5s TSI, DCS TSI, DCS 1.0s... If DCS is received within 1.0s after transmission of preamble, transmits preamble for 1.0s, then transmits DCS. TSI, DCS... Fig : DIS errors (1) Annex 2-30

43 FAX 1 UIT 1 UIT 2 FAX 2 T CED Start R CED 2.7s CSI, DIS SF, CSI, DIS 75ms 1.0 ~ 2.5s If DIS is received, transmits DIS after transmitting preamble for more than 1.0s, then transmits DIS. If DIS is not received within 2.5s after transmission of preamble, stops transmission of preamble. 0.5s 1.0s CSI, DIS X X CRP Does not transmit if DIS has already been transmitted to the air interface. 3.6s If CRP has been received, transmits preamble 75ms following reception of CRP 0.5s SF, CSI, DIS 1.0s 1.0s length on retransfer of DIS shall be 1.0s. CRP CSI, DIS The same CSI and DIS which have been transmitted to FAX 1. SF, CSI, DIS 0.5s TSI, DCS TSI, DCS TSI, DCS Switch the modem specified by DCS 75ms Training TCF 1.5s... Fig : DIS errors (2) Annex 2-31

44 FAX 1 UIT 1 UIT 2 FAX 2 CSI, DIS SF, CSI, DIS 0.5s s CSI, DIS CRP SC, CIG, DTC/SF, CSI, DIS X X 200ms 0.5s SF, CSI, DIS CSI, DIS 1.0s The same CSI and DIS which have previously transmitted to FAX s CRP SF, CSI, DIS 0.5s SC, CIG, DTC/SF, CSI, DIS... R CIG, DTC / CSI, DIS T 1.0s CIG, DTC/CSI, DIS... Fig : DTC/DIS errors (1) Annex 2-32

45 FAX 1 UIT 1 UIT 2 FAX 2 CSI, DIS SF, CSI, DIS 0.5s 1.0 ~ 2.5s 1.0s CSI, DIS CRP SC, CIG, DTC/SF, CSI, DIS... R CIG, DTC/CSI, DIS T 75ms SF, CSI, DIS 75ms if DTC/DIS have already been received from the air interface. 1.0s CIG, DTC/CSI, DIS X X Does not transmit to the air interface 75ms SF, CSI, DIS 1.0s The same CIG, DTC/CSI, DIS which have previously been transmitted to FAX 2. CIG, DTC/CSI, DIS... Fig : DTC/DIS errors (2) Annex 2-33

46 FAX 1 FAX 2 UIT 1 UIT 2 CSI, DIS SF, CSI, DIS 0.5s 1.0 ~ 2.5s 1.0s CSI, DIS CRP TSI, DCS XX Does not transmit to the radio channel SF, CSI, DIS Training 0.5s Does not detect errors. TCF X X 200ms 800ms 1.0s 75ms Even if errors have been detected, TCF Error Detection is not transmitted. CRP CSI, DIS 1.0s The same CSI and DIS which have previously been transmitted to FAX 1. Does not transmit to the air interface 0.5s SF, CSI, DIS 1.0s TSI, DCS TSI, DCS CRP Training 1.5s TCF Does not transmit to the air interface SF, CSI, DIS If DCS has already been received on reception of DIS, transmits preamble for 1.0s, then transmits DCS. In this instance, the interval between DIS and DCS is 75ms. If DIS has already been received 5 times, transmits the appropriate DCS (i.e., the highest DCS whose content is determined by DIS and it can be transmitted twice) and TCF. 1.0s TSI, DCS... Fig : DCS errors (1) Annex 2-34

47 FAX 1 UIT 1 UIT 2 FAX 2 CSI, DIS SF, CSI, DIS 0.5s 1.0 ~ 2.5s 1.0s CSI, DIS CRP TSI, DCS Switches the modem specified by DCS. Training TSI, DCS 75ms SF, CSI, DIS 1.5s TCF 1.0s 75ms TSI, DCS X X Switches the modem specified by DCS. 2.4s 1.5s Training TCF 2.5s FTT SF, CSI, DIS CFR//CRP/FTT 75ms... FTT reception is reset by CD O of PIx. 75ms 1.0s TSI, DCS Switches the modem specified by DCS. These shall be the CSI and DCS previously transmitted to FAX 2. The maximum transmission count of DCS shall be s Training TCF... Fig : DCS errors (2) Annex 2-35

48 FAX 1 UIT 1 UIT 2 FAX 2 TSI, DCS Switches the modem specified by DCS TSI, DCS Training Does not detect errors. 1.0s 1.5s TCF X X 200ms 800ms Switches the modem to V.21. TCF Error Detection TSI, DCS Switches the modem specified by DCS Training 2.4s When TCF Error Detection has already been received, inserts errors. 1.5s TCF X X Switches the modem to V s 2.5s FTT 75ms FTT FTT When TCF Error Detection is received a 4.9s interval is not used. 1.0s TSI, DCS Switches the modem specified by DCS Does not transmit to the air interface TSI, DCS Switches the modem specified by DCS Training 75ms Training 1.5s TCF 2.4s/ 75ms 1.5s TCF Switches the modem to V.21. Switches the modem to V ms 2.5/1.0s CFR Does not transmit to the air interface CFR Fig : TCF errors (1) Annex 2-36

49 FAX 1 UIT 1 UIT 2 FAX 2 TSI, DCS Switches the modem specified by DCS TSI, DCS Training 1.0s 1.5s TCF Switch the modem to V.21. TSI, DCS Switches the modem specified by DCS Training (long, with echo protection) 75ms 2.4s 1.5s TCF X X Switches the modem to V s 2.5s FTT FTT 75ms CRP/FTT... Resets FTT reception by CD O of Pix. 1.0s TSI, DCS 75ms Training (long, with echo protection) 1.5s TCF CFR... Fig : TCF errors (2) Annex 2-37

50 FAX 1 UIT 1 UIT 2 FAX 2 Training 1.5s TCF 2.4s Switches the modem to V s 75ms TSI, DCS Switches the modem specified by DCS Training (long, with echo protection) CFR X X Stand-by for both V.21 and V.27ter (see Fig for the stand-by method) 1.5s TCF Switches the modem to V.21. DCS Switches the modem specified by DCS Training 1.5s TCF Does not transmit to the air interface Does not transmit to the air interface Since Pix has not been received within 4.9s after reception of CFR, transmits preamble for 1.0s, then transmits the same TSI and DCS which have previously been transmitted to FAX s CFR 2.4s/ 75ms 1.0s 2.5s/ 1.0s TSI, DCS CFR Switches the modem specified by DCS 75ms Switches the modem specified by DCS Training Training 1.5s TCF Pix CD on Switch the modem to V ms Does not transmit to the air interface Pix 75ms CFR Switches the modem specified by DCS Training Pix Fig : CFR errors (1) Annex 2-38

51 FAX 1 UIT 1 UIT 2 FAX 2 Training 1.5s TCF 75ms Training (long, with echo protection) 1.5s TSI, DCS Switches the modem specified by DCS TCF 2.4s Switches the modem to V.21. Switches the modem to V s CFR//CRP/FTT... (Resets FTT reception by CD O of Pix.) FTT 200ms 75ms 1.0s CFR x x TSI, DCS Switches the modem specified by DCS Training 1.5s TCF Switches the modem to V.21. Does not transmit in the air interface. CFR... Fig : CFR errors (2) Annex 2-39

52 FAX 1 UIT 1 UIT 2 FAX 2 Training TSI, DCS 1.5s TCF x x TCF Error Detection 75ms Switches the modem specified by DCS Training (long, with echo protection) 2.4s Switches the modem to V.21. If TCF Error Detection has already been received, errors are inserted. 1.5s TCF x x Switches the modem to V s FTT FTT FTT X X If TCF Error Detection is received, a 4.9s interval is not used. 75ms DCS Switches the modem at DCS timing Does not transmit to the air interface Training 1.0s 1.5s TCF 2.4s/ 75ms 75ms TSI, DCS Switches the modem specified by DCS 2.5s/ 1.0s Training 1.5s TCF CFR Switches the modem specified by DCS Switch the modem to V.21. Does not transmit in the air interface. Training Pix CD on 75ms CFR Switches the modem specified by DCS Training Pix Pix Fig : FTT errors (1) Annex 2-40

53 FAX 1 UIT 1 UIT 2 FAX 2 Training 1.5s TCF 75ms Training (long, with echo protection) 1.5s TSI, DCS Switch the modem specified by DCS TCF X X 2.4s Switches the modem to V.21. Switches the modem to V s FTT 200ms FTT X X CFR//CRP/FTT... (Resets FTT reception by CD O of Pix.) 1.0s TSI, DCS 75ms Switch the modem specified by DCS Training 1.5s TCF Switches the modem to V.21. Does not transmit to the air interface CFR... Fig : FTT errors (2) Annex 2-41

54 Start Switches the modem to V.27ter. 3ms Wait (Depends on OS performance) Carrier detection (modem status output register FCD: O)? P detection counter = 0 P non-detection counter = 0 P detection (modem status output register training: O)? P non-detection counter = P non-detection counter + 1 P detection counter = P detection counter + 1 P non-detection counter <100? P detection counter 4? Switches the modem to V.21. Judges that P is detected. P detection counter = 0 P non-detection counter = 0 End Fig : Stand-by method for both V.21 and V.27ter Annex 2-42

55 FAX 1 UIT 1 UIT 2 FAX 2 Training Assumes as image signal after CD on. Accumulation of image signals exceeds the SED FAX value. Accumulation of image signals exceeds the SED_RADIO value. Training Inserts fill for the minimum transmission time specified by DCS. Pix Pix (Retransfer control) The image signal memory fill insertion control is executed for each line. (See Fig ) EOL One line image signal Fill EOL Minimum transmission time specified by DCS 4.5s RTC RTC detection EOP/MPS/EOM MCF RTC Pix ED The following processing is performed on reception of Pix ED. (1) Even if accumulation of picture signals does not reach the SED_ FAX value, all the image data is sent to the line side. (2) The image signal memory fill insertion control stops. RTC Fig : Image signal transmission procedure Annex 2-43

56 Start Accumulation of image signals drops below fill insertion value? Start image signal memory fill insertion control Accumulation of image signals exceeds fill insertion cancel value? Interval between EOLs (one line period) reaches 4.5s? Stop image signal memory fill insertion control End Fig : Fill insertion control algorithm used for the image signal memory Annex 2-44

57 Start Fill inserted for 4.5s but image signals to be transmitted below the forced RTC transmission value? o Transmit RTC to the FAX 2 side to force end of Phase C. o Wait for a post-message (EOP, EOM, MPS) received from the air interface channel. o The previously transmitted image signal is not retransferred. End Fig : Control algorithm for image signal reception side FAX (without transmitted image signal) Annex 2-45

58 FAX 1 UIT 1 UIT 2 FAX 2 Pix Pix Pix RTC Switches the modem to V.21. RTC Pix End RTC EOP Switches the modem to V ms MCF//CRP/RT 75ms/2.4s 1.0/ 2.5s EOP The following items are decided by the buffer capacity of Units 1 and 2. (1) Time interval between EOP and MCF preamble (75ms/2.4s). (2) length (1.0s/2.5s) (3) MCF//CRP (1st, 2nd times)/ RT (3rd time) EOP 1.0s Does not transmit to the air interface. MCF DC DC 75ms ~ 4.9s OFF REQ for MS unit. 1.0s DC OFF REQ for MS unit. Fig : End-of-procedure control basic sequence Annex 2-46

59 FAX 1 UIT 1 UIT 2 FAX 2 Pix Pix Pix RTC Switches the modem to V.21. RTC Pix End RTC EOP MCF//CRP/RT 75ms/2.4s 1.0/ 2.5s EOP The following items are decided by the buffer capacity of Units 1 and 2. (1) Time interval between EOP and MCF preamble (75ms/2.4s). (2) length (1.0s/2.5s) (3) MCF//CRP (1st, 2nd times)/ RT (3rd time) Switches the modem to V.21. EOP 1.0s 75ms Does not transmit to the air interface. RTP/RT DC DC 75ms ~ 4.9s OFF REQ for MS unit. 1.0s OFF REQ for MS unit. DC Fig : End-of-procedure control basic sequence (when the response to EOP is RTP or RT) Annex 2-47

60 FAX 1 UIT 1 UIT 2 FAX 2 Pix Pix Pix RTC Switches the modem to V.21. RTC Pix End PRI-EOP Replaces PRI-EOP with EOP. RTC Switches the modem to V ms MCF//CRP/RT 75ms/2.4s 1.0/ 2.5s EOP The following items are decided by the buffer capacity of Units 1 and 2. (1) Time interval between PRI-Q and MCF preamble (75ms/2.4s). (2) length (1.0s/2.5s) (3) MCF//CRP (1st, 2nd times)/ RT (3rd time) EOP 1.0s Does not transmit to the air interface. MCF DC DC 75ms ~ 4.9s OFF REQ for MS unit. 1.0s DC OFF REQ for MS unit. Fig : End-of-procedure control sequence (for PRI-EOP) Annex 2-48

61 FAX 1 UIT 1 UIT 2 FAX 2 Pix Pix Pix RTC Switches the modem to V.21. RTC Pix End RTC EOP Switches the modem to V ms MCF//CRP/RT 75ms/2.4s 1.0/ 2.5s EOP The following items are decided by the buffer capacity of Units 1 and 2. (1) Time interval between EOP and MCF preamble (75ms/2.4s). (2) length (1.0s/2.5s) (3) MCF//CRP (1st, 2nd times)/ RT (3rd time) EOP 1.0s Does not transmit to the air interface. PIP/PI DC DC 75ms ~ 4.9s OFF REQ for MS unit. 1.0s DC OFF REQ for MS unit. Fig : End-of-procedure control basic sequence (when the response to EOP is PIP or PI) Annex 2-49

62 FAX 1 UIT 1 UIT 2 FAX 2 Pix (1) Pix (1) RTC Switches the modem to V.21. Pix (1) RTC Pix End MPS 75ms/2.4s MPS RTC Switches the modem to V ms 1.0/ 2.5s The following items are decided by the buffer capacity of Units 1 and 2. (1) Time interval between MPS and MCF preamble (75ms/2.4s). (2) length (1.0s/2.5s) (3) MCF/RTP 1.0s MCF/RTP Switches the modem specified by DCS. Training The number of times for transmission of MPS is decided by the buffer capacity of Unit 2 (max. 12 times.) CD on MPS MCF Pix (2) Pix (2) Does not transmit to the air interface. Switches the modem specified by DCS. Training 75ms Pix (2) Fig : Multi-page control basic sequence Annex 2-50

63 FAX 1 UIT 1 UIT 2 FAX 2 Pix (1) Pix (1) Pix (1) RTC Switch the modem to V.21. RTC Pix End MPS 75ms/2.4s MPS RTC Switches the modem to V ms MCF/RTP 1.0/ 2.5s The following items are decided depending on the buffer capacity of Units 1 and 2. (1) Interval between MPS and MCF preamble (75ms/2.4s) (2) length (1.0s/2.5s) (3) MCF/RTP MPS 1.0s Does not transmit to the air interface. Training Pix (2) 75ms RTP/RT Pix (2) 1.0s TSI, DCS The same TSI, DCS previously transmitted to FAX 2. 75ms Training 1.5s TCF Does not transmit to the air interface. CFR 75ms Training Even if RT is received, Pix (1) is not retransferred. Pix (2) Fig : Multi-page control sequence (when the response to MPS is RTP or RT) Annex 2-51

64 FAX 1 UIT 1 UIT 2 FAX 2 Pix (1) Pix (1) RTC Switches the modem to V.21. Pix (1) RTC Pix End PRI-MPS MCF/RTP Training 75ms/2.4s Switch the modem specified by DCS. 1.0/ 2.5s Replaces PRI-MPS with MPS MPS The following items are decided by the buffer capacity of Units 1 and 2. (1) Time interval between PRI-Q and MCF preamble (75ms/2.4s). (2) length (1.0s/2.5s) (3) MCF/RTP The number of times for transmission of MPS is decided by the buffer capacity of Unit 2 (max. 12 times.) CD on RTC Switches the modem to V ms 1.0s MPS Pix (2) Pix (2) Does not transmit to the air interface. MCF Switch the modem specified by DCS. Training 75ms Pix (2) Fig : Multi-page control sequence (for PRI-MPS) Annex 2-52

65 FAX 1 UIT 1 UIT 2 FAX 2 Pix (1) Pix (1) Pix (1) RTC Switch the modem to V.21. RTC Pix End MPS 75ms/2.4s MPS RTC Switches the modem to V ms MCF/RTP Switches the modem specified by DCS. Training 1.0/ 2.5s The following items are decided depending on the buffer capacity of Units 1 and 2. (1) Interval between MPS and MCF preamble (75ms/2.4s) (2) length (1.0s/2.5s) (3) MCF/RTP Does not transmit to the air interface. CD on MPS PIP/PI 1.0s 75ms Pix (2) Pix (2) 1.0s The same TSI, DCS previously transmitted to FAX 2. TCF must always be transmitted errorfree. (Even if error is detected in received TCF, it does not influence on transmission of TCF). TSI, DCS Switches the modem specified by DCS. Training (long, with echo protection) 75ms 1.5s TCF Switches the modem to V.21. Does not transmit to the air interface CFR Switches the modem specified by DCS. 75ms Training (long, with echo protection) Pix (2) Fig : Multi-page control sequence (when the response to MPS is PIP or PI) Annex 2-53

66 FAX 1 UIT 1 UIT 2 FAX 2 Pix Pix Pix RTC Switches the modem to V.21. RTC Pix End EOM 75ms/2.4s EOM RTC Switches the modem to V ms 1.0/ 2.5s 1.0s MCF/no response EOM 6.0s Does not transmit to the air interface. MCF 1.0s The same DIS, CSI previously transmitted to FAX 1. T2 (=6 1s) CSI, DIS Does not transmit to the air interface. SF, CSI, DIS TSI, DCS TSI, DCS 75ms ~ 0.5s If DCS is received from the air interface within 0.5s after reception of DIS, transmits DCS following a 1.0s preamble. If DCS is not received within 0.5s after transmission, transmits CRP. If DCS is received more than 0.5s later, waits for reception of DIS a second time, then transmits DCS 75ms after reception of the DIS. 1.0s TSI, DCS Fig : End-of-message control basic sequence Annex 2-54

67 Start BF in backward channel control information O or T-unit busy? Interval between EOM and preamble = 75ms. Interval between EOM and preamble = 2.4s. BF in backward channel control information O or T-unit busy? length = 1.0s length = 2.5s BF in backward channel control information O or T-unit busy? received 3 times in post-message consecutively from the FAX 1 side? Response by MCF o response End Fig : Algorithm for EOM Response selection for unit 1 Annex 2-55

68 FAX 1 UIT 1 UIT 2 FAX 2 Pix Pix Pix RTC Switches the modem to V.21. RTC Pix End EOM 75ms/2.4s EOM RTC Switches the modem to V ms 1.0/ 2.5s 1.0s MCF/no response EOM 6.0s Does not transmit to the air interface. MCF 1.0s The same DIS, CSI previously transmitted to FAX 1. T 2 (=6 1s) CSI, DIS Does not transmit to the air interface. SF, CSI, DIS 75ms ~ 0.5s SC, CIG, DTC/SF, CSI, DIS... R CIG, DTC/CSI, DIS T 1.0s CIG, DTC/CSI, DIS... Fig : End-of-message control sequence (for reception on the activating side) Annex 2-56

69 FAX 1 UIT 1 UIT 2 FAX 2 Pix Pix Pix RTC Switches the modem to V.21. RTC Pix End EOM 75ms/2.4s EOM RTC Switches the modem to V ms 1.0/ 2.5s 1.0s MCF/no response EOM 6.0s Does not transmit to the air interface. RTP/RT 1.0s The same DIS, CSI previously transmitted to FAX 1. T 2 (=6 1s) CSI, DIS Does not transmit to the air interface. SF, CSI, DIS TSI, DCS TSI, DCS 75ms ~ 0.5s 1.0s TSI, DCS Fig : End-of-message control sequence (when the response to EOM is RTP or RT) Annex 2-57

70 FAX 1 UIT 1 UIT 2 FAX 2 Pix Pix Pix RTC Switches the modem to V.21. RTC Pix ED PRI-EOM 75ms/2.4s Replaces PRI-EOM with EOM. EOM RTC Switches the modem to V ms 1.0/ 2.5s 1.0s MCF/no response EOM 6.0s Does not transmit to the air interface. MCF 1.0s The same DIS, CSI previously transmitted to FAX 1. T 2 (=6 1s) CSI, DIS Does not transmit to the air interface. SF, CSI, DIS TSI, DCS TSI, DCS 75ms ~ 0.5s 1.0s TSI, DCS Fig : End-of-message control sequence (for PRI-EOM) Annex 2-58

71 FAX 1 UIT 1 UIT 2 FAX 2 Pix Pix Pix RTC Switches the modem to V.21. RTC Pix End EOM 75ms/2.4s EOM RTC Switches the modem to V ms 1.0/ 2.5s 1.0s MCF/no response EOM 6.0s Does not transmit to the air interface. PIP/PI T 2 (=6 1s) 1.0s The same DIS, CSI previously transmitted to FAX 1. CSI, DIS Does not transmit to the air interface. SF, CSI, DIS TSI, DCS TSI, DCS 75ms ~ 0.5s 1.0s TSI, DCS Fig : End-of-message control sequence (when the response to EOM is PIP or PI) Annex 2-59

72 FAX 1 UIT 1 UIT 2 FAX 2 Pix Pix Pix RTC Switches the modem to V.21. RTC Pix End EOP/MPS/EOM X X RTC Switches the modem to V ms T 4 (=3.0s 15%) 1.0s EOP/MPS/EOM EOP/MPS/EOM 200ms ~ 4.9s 1.0s/ 2.5s If EOP/MPS/EOM is received during transmission of preamble or interval, transmits preamble for 1.0s, then transmits EOP/MPS/EOM. The maximum number of transmission times for preamble only is s MCF EOP/MPS/EOM Does not transmit to the air interface. MCF Fig : EOP/MPS/EOM errors (1) Annex 2-60

73 FAX 1 UIT 1 UIT 2 FAX 2 Pix Pix Pix RTC Switches the modem to V.21. RTC Pix End EOP/MPS/EOM 75ms/2.4s EOP/MPS/EOM RTC Switches the modem to V ms MCF 1.0s/ 2.5s If EOP/MPS/EOM is received during transmission of preamble or interval, transmits preamble for 1.0s, then transmits EOP/MPS/ EOM. The maximum number of transmission times for preamble only is s... EOP/MPS/EOM X X 3.6s 75ms after reception of CRP, preamble is transmitted for 1.0s. 1.0s EOP/MPS/EOM... Fig : EOP/MPS/EOM errors (2) Annex 2-61

74 FAX 1 UIT 1 UIT 2 FAX 2 Pix Pix Pix RTC Switches the modem to V.21. RTC Pix End EOP/MPS/EOM 75ms/2.4s EOP/MPS/EOM RTC Switches the modem to V ms 1.0s/ 2.5s 1.0s MCF EOP/MPS/EOM 200ms MCF X X 1.0s EOP/MPS/EOM Does not transmit to the air interface. MCF Fig : MCF errors (1) Annex 2-62

75 FAX 1 UIT 1 UIT 2 FAX 2 Pix Pix RTC Switches the modem to V.21. Pix RTC Pix End EOP 75ms/2.4s EOP RTC Switches the modem 75 ms to V / 2.5s 1.0s MCF X X EOP Does not transmit to the air interface. EOP 75ms/2.4s 1.0/ 2.5s MCF MCF 75ms ~ 4.9s DC DC If DC is received within 4.9s after reception of MCF, transmits preamble for 1.0s immediately, then transmits DC. If DC has not been received within 4.9s, starts transmission of preamble. If DC is received during transmission of preamble, then transmits DC after transmission of the 1.0s preamble. If DC has not been received, then transmits EOP after transmission of the 1.0s preamble. 1.0s DC Fig : MCF errors (2) Annex 2-63

76 FAX 1 UIT 1 UIT 2 FAX 2 Pix Pix RTC Switches the modem to V.21. Pix RTC Pix End MPS 75ms/2.4s MPS RTC Switches the modem to V ms 1.0/ 2.5s 1.0s MCF X X Stand-by for both V.21 and V.27ter MPS MPS Does not transmit to the air interface. 75ms/2.4s MCF MCF Switches the modem specified by DCS. Training 1.0/ 2.5s If Pix is received within 4.9s after reception of MCF, transmits training immediately after reception of Pix. If Pix is not received within 4.9s, transmits preamble for 1.0s, then retransmits MPS. Detection of RTC Switches the modem specified by DCS. 75ms ~4.9s Pix Pix Training Pix Fig : MCF errors (3) Annex 2-64

77 FAX 1 UIT 1 UIT 2 FAX 2 Pix Pix RTC Switches the modem to V.21. Pix RTC Pix End EOM 75ms/2.4s EOM RTC Switches the modem to V ms 1.0/ 2.5s 1.0s MCF X X EOM EOM 75ms/2.4s Does not transmit to the air interface. MCF 1.0/ 2.5s MCF T 2 (=6 1s) 6.0s Does not transmit to the air interface. SF, CSI, DIS 1.0/ 2.5s CSI, DIS The same CSI, DIS previously transmitted to FAX 1. Fig : MCF errors (4) Annex 2-65

78 FAX 1 UIT 1 UIT 2 FAX 2 Pix Pix RTC Switches the modem to V.21. Pix RTC Pix End EOP/MPS/EOM 75ms/2.4s EOP/MPS/EOM RTC Switches the modem to V ms 1.0/ 2.5s 1.0s... MCF EOP/MPS/EOM 200ms RTP/RT X X 1.0s EOP/MPS/EOM Does not transmit to the air interface. RTP/RT... Fig : RTP/RT errors Annex 2-66

79 FAX 1 UIT 1 UIT 2 FAX 2 Pix Pix Pix RTC Switches the modem to V.21. RTC Pix End PRI-EOP/MPS/EOM X X RTC Switches the modem to V ms T 4 (=3.0s+15%) If EOP/MPS/EOM is received during transmission of preamble, transmits EOP/MPS/EOM after the completion of transmission of the 1.0s preamble. 1.0s 200ms ~ 4.9s PRI-EOP/MPS/EOM EOP/MPS/EOM 75ms/2.4s 1.0s/ 2.5s Replaces PRI-EOP/MPS/EOM with EOP/MPS/EOM. 1.0s MCF EOP/MPS/EOM Does not transmit to the air interface. MCF Fig : PRI-EOP/MPS/EOM errors Annex 2-67