џWPCL ћџ2BJ|xа АH аа АА X агга ХА6p&А6p&Х аеЄ† а Hр аааУ Уб cмˆ4 PŽТ б Fascicle VII.2 Р-Р Rec. U.80 PAGE1 Єее† а HH аааУ Уб cмˆ4 PŽТ бPAGE12 Fascicle VII.2 Р-Р Rec. U.80 еа H№ ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаа X  аб cмˆ4 PŽТ бTHE DRAWINGS CONTAINED IN THIS RECOMMENDATION HAVE BEEN DONE IN AUTOCAD. ‚У УRecommendation U.80 аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџH јP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаСр(<Сб cмˆ4 PŽТ бINTERNATIONAL б cмˆ4 PŽТ бTELEX STORE AND FORWARD ACCESS FROM TELEX аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаСр(<Сб cмˆ4 PŽТ бФ ФУУ(MalagaР-РTorremolinos, 1984; amended at Melbourne, 1988)ФФ аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHјP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаТа ТThe CCITT,ЦЦ аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаУУconsidering а H аФФС С(a)СpСthat telex store and forward units exist, and are being introduced increasingly into national networks; а H аС С(b)СpСthat access procedures and protocols differ significantly between different units; а H аС С(c)СpСthat to facilitate international access to store and forward units, a standard access procedure would be desirable, УУunanimously declares the view а H аФФС Сthat the telex access procedure described in this Recommendation should be adopted for all future store and forward units providing incoming international telex access. аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHјP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬа‚У У1ТX ТScopeФ ФЦЦ а H ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬа1.1С  СThis Recommendation describes a procedure for a telex subscriber to gain access to a store and forward unit in a foreign country by using an international telex switched connection. The procedure uses two stage selection. 1.2С  СThis Recommendation is one of a series which define telex store and forward services. The other Recommendations are: а H аТа ТР-РТ№ ТRecommendation F.72: International telex store and forward Р-Р General principles and operational aspects.ЦЦ а H аТа ТР-РТ№ ТRecommendation U.81: International telex store and forward Р-Р Delivery to telex.ЦЦ Та ТР-РТ№ ТRecommendation U.82: International telex store and forward Р-Р Interconnection of telex store and forward units.ЦЦ а HH ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHјP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬа‚У У2ТX ТOutline of service featuresФ ФЦЦ а H№ ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬа2.1С  СThe full range of service features is described in more detail in Recommendation F.72. аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHјP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬа2.2Тh  ТУУService principlesЦЦ а H ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаФФ2.2.1С СThe procedure defined in this Recommendation is a two stage selection procedure whereby a calling telex subscriber gains access to a foreign store and forward unit (SFU) in the first stage of selection and inputs the called address(es) and message in the second stage of selection, after the return of a call connected signal. С СThe option of a store and retrieval facility is for further study. 2.2.2С СInternational access to the SFU should be offered on the basis of bilateral agreement between Administrations, and barring facilities should be provided to prevent unauthorised use. The method of barring shall be the responsibility of the Administration of the SFU service and is beyond the scope of this Recommendation. It may also be necessary for Administrations to make provision to selectively bar access to international telex SFU facilities in other countries. а H а2.2.3С СMessage input from both manual and automatic emitting devices should be accommodated. It is also possible that messages may be received from another SFU, and this type of input should also be accommodated by bilateral agreement. а H а2.2.4С СFor calling subscribers with answerbacks that cannot be processed to obtain the calling address, the SFU shall be able to handle direct input of the address from the subscriber, with or without prompt. а H а2.2.5С СA status enquiry facility should be provided internationally to provide information on message delivery in response to a request from the originator. This message status enquiry point will be accessed by a separate access code to that used for message input. а H аС СWhen the SFU provides automatic advice of delivery and nonР-Рdelivery, or a request for positive delivery can be indicated, then the provision of status enquiry facilities is optional. а H а2.2.6С СAddress validation of the called telex subscriber(s) may be provided, however, delivery of the message to a given address cannot be fully guaranteed. аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHјP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬа‚У У3ТX ТOutline of facilitiesФ ФЦЦ а H ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬа3.1С  СThe full range of facilities is described in more detail in Recommendation F.72. аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHјP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬа3.2Тh  ТУУMessage input accessЦЦ аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаФФ3.2.1С СProvision should be made for both single and multiР-Рaddressed calls. а H а3.2.2С СMessages received by the SFU for delivery to destinations not served by that SFU should be given a NonР-РDelivery Notification with service code NA for the reason of nonР-Рdelivery. а H а3.2.3С СThe maximum acceptable number of addresses in a multiР-Рaddress call shall be agreed between Administrations, but should be at least 20. If the а H аmaximum number of addresses is exceeded, the SFU shall return the service code TMA and clear the connection. а H а3.2.4С СAn attention information field facility should be provided by the SFU which enables each addressee of a multiР-Рaddress message to have a relevant attention prefix preceding the message. 3.2.5С СThree classes of delivery service should be provided by the SFU: а H аТа ТТ№ ТС€ Сa)СpСnormal delivery. The SFU delivers the message as soon as operationally feasible after receipt;ЦЦ Та ТТ№ ТС€ Сb)СpСdelayed delivery. The delay can be either:ЦЦ а H аТа ТТ№ ТТhpТС€Сi)Си Сset by the Administration offering the SFU service, if the calling customer selects this option,ЦЦ а H аТа ТТ№ ТТhpТС€Сii)Си Сset by the calling subscriber, such that delivery of the message is not attempted until after the expiration of the indicated delay;ЦЦ а H аТа ТТ№ ТС€ Сc)СpСtime limited delivery set by the calling subscriber, such that delivery of the message is attempted within a specified time limit.ЦЦ а H аС СThe desired class of delivery should be selectable on a destination address basis. а H а3.2.6С СPositive delivery notification (PDN) when provided may be requested by the calling subscriber on a per message or on a per address basis. а H а3.2.7С СMessage reference number(s) should be returned to the calling subscriber. 3.2.8С СAddress correction procedures are considered desirable and may be provided. 3.2.9С СProvision should be made to accept followР-Рon message(s) with their associated address(es) which may be sent as separate block(s) immediately after the first message. Provision should also be made to acknowledge acceptance of messages, if requested by the calling terminal, at any point during a transaction. а H а3.2.10С СThe SFU shall not accept the input of a message or followР-Рon messages (in the message input mode) unless adequate storage is available. The minimum storage available per message text input should be agreed bilaterally between Administrations. However, it is recommended that the minimum storage available on a per message basis should be 24 000 characters. For an interim period 12 000 characters is acceptable. Longer messages may be accepted if storage continues to be available. а H а3.2.11С СAn Input Transaction Accepted for Delivery (ITD) service signal should be returned to the calling subscriber to indicate that the SFU has accepted the message. а H а3.2.12С СThe following facilities are not accommodated in the procedures, do not form part of this Recommendation and are for further study: Та ТТ№ ТС€ Сa)СpСuse of preР-Рrecorded address lists;ЦЦ Та ТТ№ ТС€ Сb)СpСmessage editing facilities;ЦЦ Та ТТ№ ТС€ Сc)СpСaddress collation facilities;ЦЦ Та ТТ№ ТС€ Сd)СpСrequests for positive delivery advices;ЦЦ Та ТТ№ ТС€ Сe)СpСtransparent mode in message input phase;ЦЦ Та ТТ№ ТС€ Сf)СpСcalled address format checks.ЦЦ а HH ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHјP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬа3.3Тh  ТУУStatus enquiry accessЦЦ а H ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаФФ3.3.1С СStatus information on messages should only be available for return to the originator of the message. 3.3.2С СStatus information may be requested on: Та ТТ№ ТС€ Сa)СpСall addresses associated with a message reference number;ЦЦ Та ТТ№ ТС€ Сb)СpСaddresses which have not yet received the message;ЦЦ Та ТТ№ ТС€ Сc)СpСa specific address.ЦЦ а HH ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHјP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬа‚У У4ТX ТAccess proceduresФ ФЦЦ 4.1Тh  ТУУGeneralЦЦ аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаФФ4.1.1С СTwo basic access procedures should be provided: Та ТТ№ ТС€ Сa)СpСУУInteractive operationЦЦ а H аТа ТТ№ ТТhpТС€СФФInput from manual calling terminals, where the SFU may return prompt signals.ЦЦ Та ТТ№ ТС€ Сb)СpСУУNonР-Рinteractive operationЦЦ а H аТа ТТ№ ТФФР-РТhpТEither, input from automatic emitting devices or from subscribers' terminals, where prompt signals from the SFU are not required;ЦЦ Та ТТ№ ТР-РТhpТor, input from another SFUЦЦ Та ТТ№ ТТhpТУУNoteФФ Р-Р detection of this type of access will rely on the identification of the calling SFU answerback, the format of this answerback is for further study.ЦЦ а H аТа ТТ№ ТТhpТТhи ТС€pСIn this case the procedure used is described in Recommendation U.82.ЦЦ а HH а4.1.2С СFigure 1/U.80 shows the recommended access procedures. ‚Ср8EСб cмˆ4 PŽТ бFigure 1/U.80 Љ CCITT 67903 б cмˆ4 PŽТ б а H аадаб cмˆ4 PŽТ бУУNote 1ФФ Р-Р The WRU is transmitted 800 ms after transmission of the SFU answerback if the forward path remains idle. УУNote 2ФФ Р-Р One additional WRU shall be transmitted by the SFU if: С Сa)СpСthere was no response to the first WRU. а H аС Сb)СpСsignals were received after the first WRU which could not be identified as an answerback. а H аThis second WRU should be transmitted when a 300 ms idle condition has been detected from the calling terminal at least 2 seconds after the transmission of the first WRU. а H аУУNote 3ФФ Р-Р Case A: Procedure when calling address can be determined from the calling terminal answerback. а H аУУNote 4ФФ Р-Р Case B: Procedure when calling address cannot be determined from the calling terminal answerback. а H аУУNote 5ФФ Р-Р The prompt GA and the preceding optional message reference information shall be transmitted three seconds after receipt of the calling terminal answerback. If the caller initiates input within the three seconds timeout, the message reference information and prompt will be withheld. а H аУУNote 6ФФ Р-Р The prompt Р"РADDР"Р and the precedint optional message reference information shall be transmitted three seconds after receipt of the calling terminal answerback. If the caller initiates input within the three seconds timeout, the reference information and prompt will be withheld. а H аУУNote 7ФФ Р-Р The service request CI is transmitted when the terminal is operating in a nonР-Рinteractive mode (e.g. an automatic terminal or a manual terminal using a tape transmitter). а H аУУNote 8ФФ Р-Р If the calling address is expected and is not received within 15 seconds of the original Р"РADDР"Р prompt, a further prompt shall be transmitted. The procedure is shown in Figure 2/U.80. а H аThe calling address should be input in the format F.69 destination code followed by the national telex number followed by at least 2 carriage returns, line feed sequences when received in the nonР-Рinteractive mode. а H аУУNote 9ФФ Р-Р The prompt GA is inhibited if the service request CI has been received or if the caller has initiated input. а H аУУNote 10ФФ Р-Р Several messages can be contained within the same transaction and are separated by EOM sequences, as in Figure 3/U.80. а H аУУNote 11ФФ Р-Р The EOM signal may optionally be followed directly by an ACK request signal. The sequence will then be as shown in Figure 4/U.80. а H аImmediately following transmission of an IMA, the SFU shall return reference information for previous unacknowledged messages, the signal <Љ=У УGAФ Ф<Љ= and then be prepared to accept further followР-Рon messages. а H аУУNote 12ФФ Р-Р Following receipt of the EOT signal the SFU shall operate as shown in Figure 5/U.80. а H аС Сa)СpСIf the EOT signal originated from a nonР-Рinteractive telex terminal, the SFU should wait for up to 2 seconds for a WRU signal. If WRU is received, the SFU should return its answerback followed immediately by the ITD sequence. If WRU is not received in the 2 second period, the SFU should return the ITD sequence; а H аС Сb)СpСIf the EOT signal originated from an interactive telex terminal, the SFU should return the ITD sequence as soon as possible; а H аС Сc)СpСThe ITD signal and associated reference information must be returned within 5 seconds of the EOT signal. а H аУУNote 13ФФ Р-Р If a WRU signal is received at any time during the procedure, the SFU shall return its own answerback. аа‚Ср ?СFIGURES 2 Р-Р 5/U.80 Љ CCITT 72820, 72830, 72841, 72851 б cмˆ4 PŽТ б аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџH јP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаТX  ТТX јТС€  СС€ HС4.2С   Сб cмˆ4 PŽТ бУУTelex accessЦЦ а H ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаб cмˆ4 PŽТ бФФ4.2.1С СThe calling telex subscriber should establish a call to the SFU by means of normal telex procedures. а H а4.2.2С СFollowing transmission of the SFU answerback, the SFU should not send a WRU immediately. The SFU should monitor the forward path and transmit the WRU only when an idle condition has persisted for at least 800 ms. If a 800 ms idle condition has not been detected within 15 s of the transmission of the SFU answerback, the call should be cleared. С СУУNoteФФ Р-Р SFU answerback is not returned if the SFU cannot accept the guaranteed message length (see РSР 3.2.9). In this case OCC is returned. 4.2.3С СAn additional WRU should be transmitted if: Та ТТ№ ТС€ Сa)СpСthere is no response to the first WRU;ЦЦ а H аТа ТТ№ ТС€ Сb)СpСsignals were received after the first WRU that could not be identified as an answerback.ЦЦ а H аС СThe second WRU should be sent when a 300 ms idle condition has been received from the calling terminal at least 10 s after the transmission of the first WRU. а H аС СУУNoteФФ Р-Р The 300 ms and 10 s periods suggested here are provisional and may need to be changed in the light of experience. С СIf a continuous input of signals is detected for 15 seconds after the return of the SFU answerback, the SFU shall clear the call. аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHјP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬа4.3Тh  ТУУMessage reference informationЦЦ а H ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаФФ4.3.1С СThe message reference information may be returned after a 3 second timeout from receipt of the calling terminals answerback. If the SFU detects input before timeout, then the message reference information will be withheld. С СThe message reference information may comprise date and time and/or message reference number. аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHјP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаТа ТС€ HС4.3.2С јСУУDate and timeЦЦ а H ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаФФ4.3.2.1СpСThe date and time of message input may be returned to the calling telex subscriber before message input. 4.3.2.2СpСThe transmitted date and time should be: аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHp8А"(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџ Ьа‚С СС pССШ8!С<Љ=YYƒР-РMMР-РDD/HHР-РNN аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаwhere Та ТТ№ ТС€ СYY represents two numeric characters indicating the year;ЦЦ Та ТТ№ ТС€ СMM represents two numeric characters indicating the month;ЦЦ Та ТТ№ ТС€ СDD represents two numeric characters indicating the day;ЦЦ а H аТа ТТ№ ТС€ СHH represents two numeric characters indicating the hour on a 0Р-Р24 basis;ЦЦ Та ТТ№ ТС€ СNN represents two numeric characters indicating the minute.ЦЦ Та ТТ№ ТС€ СУУNoteФФ Р-Р Local time of the SFU should be used.ЦЦ а HH ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHјP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаТа ТС€ HС4.3.3С јСУУMessage reference numberЦЦ а H ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаФФС СA message reference number may also be returned to the calling telex subscriber before message input. С СThe reference number would comprise up to six numeric characters and should follow immediately after the date and time information after a oneд Д-д space character. С СThe reference number should cycle through consecutively for followР-Рon messages within the same transaction. Accommodation should be made to cycle the last two or three digits for followР-Рon messages. аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHјP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬа4.4Тh  ТУУService requestЦЦ Та ТС€ HСФФ4.4.1С јСУУInteractive service requestЦЦ а H ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаФФС СThe calling telex subscriber shall be recognized as interactive by the omission of the nonР-Рinteractive service request (see РSР 4.4.2). аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHјP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаТа ТС€ HС4.4.2С јСУУNonР-Рinteractive service requestЦЦ а H ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаФФС СThe calling telex subscriber should indicate that the transmission is from an automatic terminal by commencing the procedure with the nonР-Рinteractive service request (characters CI). аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHјP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬа4.5Тh  ТУУCalling telex addressЦЦ а H ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаФФ4.5.1С СThe SFU shall use an algorithm (see Recommendation U.74) to attempt to determine the calling telex address from the captured calling answerback. If this cannot be achieved the SFU shall return a prompt signal (<-=У УADDФ Ф<Љ=) to solicit the calling subscriber number. а H аС СThis prompt shall be returned after the optional message reference number, but not before a period of three seconds from receipt of the calling terminals answerback. If the SFU detects input within this time then the prompt will be withheld. а H а4.5.2С СThe calling address may be preceded by a CI character sequence which signifies the nonР-Рinteractive service request (see РSР 4.4.2). The CI characters sequence may or may not be associated with carriage return, line feed or letter shift characters. а H а4.5.3С СIf the calling address is not received within 15 seconds of the original prompt signal (ADD), another prompt shall be returned once more to try to solicit the calling address. If another 15 seconds elapse the connection shall be cleared. а H а4.5.4С СAddress input can be cancelled (in the case of mistakes) using the same procedure as РSР 4.7.10. а H а4.5.5С СThe calling address should be input in the format: F.69 code followed by the national telex number and must be followed by at least two carriage return, lineР-Рfeed sequences when received in the nonР-Рinteractive operation. Spaces, hyphens, pluses and preceding zeros shall be ignored. аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHјP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬа4.6Тh  ТУУCommence input signalЦЦ а H ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаФФС СIf the calling address is capable of being extracted from the answerback (see РSР 4.5.1) then the SFU shall return a commence input signal comprising the characters <Љ=У УGAФ Ф<Љ=; after the optional message number, but not before a period of three seconds from the receipt of the calling terminals answerback. If the SFU detects input within this time then the prompt will be withheld. а H аС СIf the address is not capable of being extracted from the answerback, the SFU shall not return the GA sequence, but shall return the ADD prompt (see РSР 4.5.1). а H аС СIn this latter case the GA prompt shall normally be returned immediately after the receipt of the calling address. However, the GA prompt should be inhibited if the service request CI precedes the calling address or the caller has initiated input. а H аС СIf the SFU has not been able to obtain the calling address, by the stage at which address input is expected, then the SFU will require that the а H аfirst address line is preceded with the keyword Р"РADDР"Р indicating that the calling address follows. а H аС СIf Р"РADDР"Р is not found, then the SFU will attempt to interrupt the calling telex subscriber in accordance with Recommendation S.4. С СIf the calling subscriber is interrupted, the service signal Р"РITRР"Р followed by the clearing signal, shall be sent indicating that the SFU has а H аbeen unable to obtain the calling subscriber address and the transaction has been terminated. С СWhen the calling subscriber cannot be interrupted, the SFU shall forcefully clear the connection. аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHјP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬа4.7Тh  ТУУAddress inputЦЦ аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаФФ4.7.1С СThe format of each address line should be as follows: Та ТТ№ ТС€ Сa)СpСaddress;ЦЦ Та ТТ№ ТС€ Сb)СpСexpected answerback or part of answerback;ЦЦ Та ТТ№ ТС€ Сc)СpСattention information;ЦЦ Та ТТ№ ТС€ Сd)СpСdelayed delivery;ЦЦ Та ТТ№ ТС€ Сe)СpСpositive delivery notification request.ЦЦ а H аС СHowever, only field a) is mandatory to the subscriber. Each address line should not be longer than 69 printable or space characters. Each address line is normally delimited by carriage return and line feed. С СУУNote 1ФФ Р-Р Additional shift or carriage control characters have to be ignored. а H аС СУУNote 2ФФ Р-Р Address lines containing more than 69 characters are for further study. 4.7.2С СEach field within an address line should be delimited by different combinations for each field. These combinations will be: Та ТТ№ ТС€ СCombination No. 26: +С"X%СEnd of each addressЦЦ а H аТа ТТ№ ТС€ СCombination No. 24: /С"X%СStart of expected answerback or part of answerbackЦЦ а H аТа ТТ№ ТС€ СCombination No. 11: (С"X%СAttention line information to be combined within these delimitersЦЦ Та ТТ№ ТС€ СCombination No. 12: )С"X%СЦЦ Та ТТ№ ТС€ СCombination No. 14: ,С"X%СStart of other optionsЦЦ а Hр аС СУУNote 1ФФ Р-Р With the exception of combination No. 26 (+) the other combinations need not be used if the subscriber does not want to use those fields. С СУУNote 2ФФ Р-Р The optional fields may be input in any order. С СУУNote 3ФФ Р-Р Handling of abnormal conditions is for further study. а H а4.7.3С СThe SFU shall return a service signal (TMA) and clear the connection if the agreed maximum number of addresses is exceeded (see РSР 3.2.3). а H а4.7.4С СThe address line(s) shall be delimited from the message by means of an EOA signal which shall be: аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHp8А"(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџ Ьа‚С СС pССШ8&С<Љ=ƒУ УBTФ Ф а H ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаС СWhen a positive delivery notification is requested on a per message basis, the EOA signal will be extended to include the indicator Р"РACKР"Р separated by Combination No. 14 (,) as follows: аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHp8А"(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџ Ьа‚С СС pССШ8%С<Љ=ƒУ УBT, ACKФ Ф а H ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаС СIt is acceptable for the EOA signal to appear on the same line as the last address. аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHјP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаТа ТС€ HС4.7.5С јСУУAddressЦЦ а H ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаФФС СThis field is the only mandatory field of the address line and may be an international telex address (in the format of the Recommendation F.69 destination code and national telex number) or another nonР-Рtelex service, e.g., Teletex. а H аС С(The format is left for further study.) To permit the SFU to recognize a Teletex address, it shall be preceded by the identifier Р"РTTXР"Р. а H аС СIf address validation is provided, the action to be taken by the SFU, if the address is not received with a valid format, is detailed in РSР 4.12.5. а H аС СThe address must be terminated by a combination No. 26 (+) whether or not optional fields are used. аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHјP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаТа ТС€ HС4.7.6С јСУУExpected answerback or part of answerbackЦЦ а H ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаФФС СThe character sequence in this field should be used as an additional check on the called subscriber answerback before the message is delivered. The inclusion of this field is optional. аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHјP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаТа ТС€ HС4.7.7С јСУУAttention informationЦЦ аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаФФС СThis field may convey the name and address of the recipient in a confidential manner. The inclusion of this field is optional. аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHјP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаТа ТС€ HС4.7.8С јСУУDelivery indicatorЦЦ а H ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаФФС СThis field indicates the type of delivery required. Omission of this field indicates that normal delivery is required. The format of the field should be: а Hx аТа ТТ№ ТС€ Сa)СpСD if the calling subscriber leaves the period of delay to the discretion of the Administration providing the SFU service;ЦЦ а H аТа ТТ№ ТС€ Сb)СpСDXY where XY are numeric characters which specify the minimum desired delay in hours from 01Р-Р23;ЦЦ а H аТа ТТ№ ТС€ Сc)СpСLXY where XY are numeric characters which specify the maximum limit for delivering the message to the addressee.ЦЦ а H а4.7.9С СWhen a positive delivery notification is required on a per address basis, the indicator Р"РACKР"Р separated by Combination No. 14 (,), shall be included as part of the address. аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHјP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаТа ТС€ HС4.7.10С јСУУExamples of the format of address lines:ЦЦ аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаТа ТТ№ ТС€ СФФa)СpС41994531+/994531 FUG D, DЦЦ Та ТТ№ ТС€ Сb)СpС41662724+(ATTENTION MR S SMITH), D12ЦЦ Та ТТ№ ТС€ Сc)СpС41246178+/246178 ADAC D (ATTENTION MR SMITH)ЦЦ Та ТТ№ ТС€ Сd)СpС4625000+ЦЦ а H а4.7.11С СAddress line editing facilities, if provided, should operate as follows: С СAny address line entered may be cancelled by the receipt of two consecutive == characters (upper case combination No. 22). аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHјP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬа4.8Тh  ТУУCalled address validationЦЦ аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаФФС СEach address line may be validated as follows: а Hx аТа ТТ№ ТС€ Сa)СpСthat the selection number consists of only numeric characters (nonР-Рnumeric characters such as space, hyphen or a valid prefix shall be tolerated) and the selection number's length falls within the range of the number of digits accepted by the SFU;ЦЦ а H аТа ТТ№ ТС€ Сb)СpСthat the first two or three significant digits constitute a valid F.69 telex country code accepted by the SFU;ЦЦ а H аТа ТТ№ ТС€ Сc)СpСthat the remainder of the address line conforms to the format specified in РSР 4.7.ЦЦ а HH ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHјP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬа4.9Тh  ТУУMessage inputЦЦ а H ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаФФ4.9.1С СCharacters received in the message text (with the exception of Figures D) should be transmitted transparently by the SFU. 4.9.2С СParagraph 6 details the action the SFU should undertake if abnormal conditions are encountered during message input. аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHјP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬа4.10УУТ№  ТEnd of message (EOM) signalЦЦ а H ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаФФС СNormally, if the calling subscriber wants to input more than one message, an end of message signal is used. This may be one of two types as follows: а H аТа ТТ№ ТС€ Сa)СpСfour combinations No. 14 (NNNN), which is simply used to separate messages;ЦЦ а H аТа ТТ№ ТС€ Сb)СpСfour combinations No. 14, then combinations 1, 3 and 11 (NNNNACK) which is used to separate messagesУУ andФФ to request the SFU for an input message acknowledgement (IMA) plus reference information of those messages not previously acknowledged (see РSР 4.11.4 for format).ЦЦ а H аС СOnce this type of EOM is received the SFU shall accept responsibility for delivery of the message, even if the subscriber clears. аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHјP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬа4.11УУТ№  ТEnd of transaction (EOT)ЦЦ аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаФФ4.11.1С СThe calling telex subscriber should indicate end of transaction by transmitting four combinations No. 26 to the SFU (++++). а H а4.11.2С СThis signal is normally used at the end of the last (or single) message input during the transaction. аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHјP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬа4.12УУТ№  ТInput transaction accepted for delivery signal (ITD)ЦЦ а H ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаФФ4.12.1С СAfter receipt of the EOT signal from a nonР-Рinteractive calling telex subscriber the SFU should wait up to 2 seconds to detect any further signals on the forward path. If a WRU signal is received in this period the SFU should respond with the SFU answerback followed by the ITD signal. If no further signals are received during this period the SFU should return the ITD signal, plus reference information (as in РSР 4.3) followed by clear. а H а4.12.2С СAfter receipt of the EOT signal from an interactive telex terminal the SFU should return the ITD signal as soon as possible. а H а4.12.3С СITD reference information must be returned within 5 seconds of the EOT signal in РSР 4.11.1 and РSР 4.11.2 above to avoid excessive holding times. а H а4.12.4С СThe ITD signal should be followed by the date and time, message reference number(s) and an indication of the total number of messages. When more than one message has been received, the reference information returned shall be that of the first and last message, e.g.: аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHp8А"(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџ Ьа‚С СС pССШ8!СITD YYƒР-РMMР-РDD/HHР-РNN С СС pССШ8!С(XXXABCƒР-РXXXDEF) P аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаwhere Та ТТ№ ТС€ СXXXABC is the first serial numberЦЦ Та ТТ№ ТС€ СXXXDEF is the last serial numberЦЦ Та ТТ№ ТС€ СP is the number of messages acknowledged.ЦЦ а H а4.12.5С СWhere address format validation is to be provided, there will be one ITD signal per message. It shall be followed by a list of all rejectedд Д-д addresses, for the corresponding message. Each rejected address may be followed by the appropriate service signal indicating reason for failed validation, e.g.: аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHp8А"(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџ Ьа‚С СС pССШ8$СREJ XXXXX YYƒ аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаwhere а H аТа ТТ№ ТС€ СREJ is the service signal indicating rejection of the given address;ЦЦ Та ТТ№ ТС€ СXXXXX is the rejected address; andЦЦ Та ТТ№ ТС€ СYY the appropriate service signal, e.g., NP, FMT, etc.ЦЦ а H аС СIn the case where all addresses have failed validation, then the SFU should attempt to interrupt the calling telex subscriber in accordance with Recommendation S.4. а H аС СIf the calling subscriber can be interrupted, the service signal Р"РITRР"Р, followed by the clearing signal shall be sent indicating that all address validations have failed and the transaction has been terminated. С СWhen the calling subscriber cannot be interrupted, the SFU shall forcefully clear the connection. аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHјP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬа‚У У5ТX ТStatus enquiryФ ФЦЦ аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаС СУУNoteФФ Р-Р This facility is for further study. аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHјP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬа5.1Тh  ТУУStatus enquiry requestЦЦ а H ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаФФ5.1.1С СA calling telex subscriber, having selected the status enquiry point (see '' 2.2.5 and 3.3) must give the SFU the following information: Та ТТ№ ТС€ Сa)СpСthe message reference information (see РSР 4.3);ЦЦ а H аТа ТТ№ ТС€ Сb)СpСan indication of whether the enquiry concerns all addresses associated with a message,УУ orФФ whether the enquiry concerns only address(es) which have not yet received the message,УУ orФФ a specified address.ЦЦ а H аС СStatus report information should be provided for all addresses unless the message reference number is followed by combination No. 22 (=), which signifies that the enquiry concerns only addresses which have not yet received the message. Also, if this character is followed by an address, this shall signify a status request on a specific address. Several reference number lines may be entered each separated by carriage return, line feed. а H аС СTermination of a status enquiry request will be indicated by the end of status request signal (EOSR), combination No. 26 (+). а H а5.1.2С СIf characters are not received on the forward path within 3 seconds of the status enquiry mode being selected, the SFU shall return a prompt signal which shall comprise combination No.2 (?). а H а5.1.3С СIf a message reference number is not received either in full, or in part, within 20 seconds of the prompt being returned, the SFU should clear the connection. а H а5.1.4С СIf an EOSR signal is not received within 20 s of the message reference number(s) input, the SFU shall continue as if an EOSR signal had been received. аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHјP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬа5.2Тh  ТУУThe status reportЦЦ а H ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаФФ5.2.1С СThe status report format will be consistent with the notification advice format dealt with in Recommendation U.81. С СTwo types of status report are returned: Та ТТ№ ТС€ Сa)СpСdelivered;ЦЦ Та ТТ№ ТС€ Сb)СpСnot delivered.ЦЦ а HH аС СSee Recommendation U.81, РSР 4.3.6 for report formats. аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHјP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬа‚У У6ТX ТAbnormal conditions during message inputФ ФЦЦ 6.1Тh  ТУУTelex subscriber clearing during text input without EOTЦЦ а H ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаФФС СThe SFU shall not forward the message to the called telex subscriber(s) а H аС СThe incomplete message should either be cancelled or optionally sent to an operator assistance position. Messages previously acknowledged in the same transaction shall be transmitted normally. аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHјP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬа6.2Тh  ТУУTelex subscriber stopping transmission for a certain time without transmitting the EOT signal, or transmitting a partial or invalid EOT signalЦЦ аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаФФС СSee Figure 6/U.80. а H аС СIf at any time between the SFU returning the GA prompt (Case A), or the calling address prompt (Case B) and the detection of the EOT signal the SFU detects a 30 second period of idle, the following shall apply: the SFU shall send a GA prompt to the telex subscriber in order to request more information input (text, EOM or EOT). If after a further 30 s no more characters are received, the SFU shall: а H аТа ТТ№ ТС€ Сa)СpСeither send BMC service code and clear the call (if the SFU cancels incomplete messages); orЦЦ а H аТа ТТ№ ТС€ Сb)СpСclear the call (if the SFU sends the message to an operator assistance position).ЦЦ а H аС СIf previous message(s) in the same transaction were delimited by NNNNACK, these shall be transmitted normally. ‚Ср LСб cмˆ4 PŽТ бFigure 6/U.80 Љ CCITT 72860 б cмˆ4 PŽТ баЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHјP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬа а H№ аТа Т6.3СP СУУTelex subscriber sending WRU to the SFU during text inputЦЦ а H ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаФФС СThe SFU should return its answerback after receiving a WRU. In addition, if: а H аТа ТТ№ ТС€ Сa)СpСWRU is followed by text, message input is continued after the SFU answerback. Also, the WRU is deleted from the message text.ЦЦ а H аТа ТТ№ ТС€ Сb)СpСWRU is followed by a clear from telex, the SFU proceeds in РSР 6.1 above.ЦЦ а H аТа ТТ№ ТС€ Сc)СpСWRU is followed by a lack of transmission (pause), the SFU proceeds as in РSР 6.2 above.ЦЦ а HH ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHјP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬа6.4Тh  ТУУTelex subscriber sending text after the EOT signalЦЦ аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаФФС СSee Figure 7/U.80. а H а6.4.1С СAny characters received between EOT and ITD (with the exception of WRU) will be ignored. а H а6.4.2С СThe SFU should immediately attempt to prevent further characters being sent by transmitting a sequence of TTT . . . characters for a maximum of 20 s. а H а6.4.3С СIf the calling terminal stops transmission for 150 ms within a 20 second period, the SFU shall return an ITD service signal followed by a clear. а H а6.4.4С СIf the terminal continues to transmit characters after the 20 second period, the SFU should forcefully clear the connection back to the calling terminal. а H а6.4.5С СThe SFU should attempt to deliver the message text received before EOT as for a normal message input. ‚Ср LСб cмˆ4 PŽТ бFigure 7/U.80 Љ CCITT 72870 б cмˆ4 PŽТ б аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHјP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬа6.5Тh  ТУУTelex subscriber clearing after EOT, but before ITDЦЦ аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаФФС СThe message shall be forwarded normally by the SFU under these circumstances. а H ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHјP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬа6.6Тh  ТУУTelex subscriber sending national variants of ITA No. 2 alphabet (F, G, H)ЦЦ аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаФФС СSince Recommendation F.60, РSР A.3.8 recommends that these combinations should not be used for international communications, the SFU should not monitor for their use and these combinations will be passed on to the called subscribers if received. аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHјP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬа6.7Тh  ТУУTelex subscriber sending J, Bell combination (J)ЦЦ а H ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаФФС СThe SFU should also transmit this combination if received, to the called party. аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHјP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬа6.8Тh  ТУУSFU storage capacity overflow during telex message inputЦЦ а H ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаФФ6.8.1С СIf the number of characters received by the SFU during a message input exceeds the available storage to that input (which may be greater than the agreed minimum storage, see РSР 3.2.9), the SFU should discard the excess characters, no attempt should be made by the SFU to overwrite previously stored characters. а H а6.8.2С СWhen this occurs the SFU should immediately attempt to prevent the calling telex subscriber from sending further characters by transmitting a sequence of TTT . . . characters for a maximum of 20 s. а H а6.8.3С СIf the calling terminal stops transmission for 150 ms within a 20 second period, the SFU should return the message length exceeded indication (LDE) and then wait for the EOT or NNNNACK in accordance with РSР 6.2. а H а6.8.4С СIf the terminal continues to transmit characters after the 20 second period, the SFU should forcefully clear the connection back to the calling terminal. а H а6.8.5С СIf an EOT/NNNNACK is received within the 20 second period, the SFU should attempt to deliver the message text, accepted and stored, preceded by a special text prefix to indicate to the called telex subscriber that the message may be incomplete. If an EOT/NNNNACK is not received the SFU shall proceed as in РSР 6.1. а H а6.8.6С СIf the SFU has insufficient storage to receive messages (see РSР 3.2.9) it should still continue to process status enquiry requests. аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHјP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬа6.9Тh  ТУУMaximum input duration exceededЦЦ а H ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаФФС СIf the time taken for a single transaction exceeds 2 hours, the SFU shall act in accordance with РSР 6.8. аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHјP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬа6.10УУТ№  ТRepeated characters during message inputЦЦ аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаФФС СThe SFU shall be capable of detecting continuous reception of one character combination and shall recognize this as a Р"Рtape stuckР"Р condition. The SFU shall detect this condition only after receipt of 80 identical combinations received consecutively. The SFU shall attempt to signal the calling terminal by transmitting a sequence of TTT . . . characters for a maximum of 20 s. If the character combinations become different the SFU shall continue with the message input and deliver all characters received. If the Р"Рtape struckР"Р condition remains at the end of 20 s, the SFU shall clear the connection and follow the procedure outlined in РSР 6.1 above.