1、Recommendation T/S 43-02 (by correspondence, April 1987) SIGNALLING SYSTEM TELEPHONE USER PART “PLUS” (TUP+) Recommendation proposed by Working Group T/WG 11 “Signalling, Protocols and Switching” (SPS) Text of the Recommendation adopted by the “Telecommunications” Commission: “The European Conferenc
2、e of Postal and Telecommunications Administrations, considering - that CCITT Recommendations 4.721-4.725 i to 5 Red Book define the Telephone User Part, - that there are a number of options and points requiring further specification in Recommendations 4.721-4.724 u1 to 41, - that the interconnection
3、 of ISDNs in Europe is an important requirement for European Administrations (see GAP report of the EEC), recommends that European Administrations who wish to interconnect ISDNs, apply the following recommendations.” INTRODUCTION This Recommendation called the Telephone User Part “Plus” (TUP+) is a
4、revised version of CCITT Recommenda- tions 4.721-4.724 (Telephone User Part). In particular, throughout the text, references and figure numbers are maintained as in the CCITT Red Book. Note. 4.72% is not included. The Recommendations are dened for use between international gateways. The interworking
5、 between this Recom- mendation, and National signalling systems is the responsibility of the Administrations concerned. This Recommendation satisfies the requirements laid down in the GAP report Phase 1 only. Note. References to 4.931 q in this Recommendation areintended in a general sense to identi
6、fy the capability of the signalling system on the access side, and do not refer to any specific document. /- Edition of August 15, 1987 CEPT T/S*43-02*E 87 = 232b414 0008079 I W . TIS 43-02 E Page 3 Contents Part I . 4.121 + . 1 . GENERAL 1 2 . TELEPHONE USER PART . 1 3 . MESSAGE TRANSFER PART . 1 F
7、iiiicfioaal Description of the Sigrialling System Telephone User Parti- (TUP+) Part II . 4.722 + . 1 . * SIGNALLINGMESSAGES . 1 2 . SERMCEINFORMATION . 2 3 . SIGNALLING INFORMATION . 2 Part III . 4.723 + . O . EXPLANATORY NOTE . 1 1 . BASIC FORMAT CHARACTEXISTICS . 1 General Firrictiori of Messages
8、or ii) if the range field is coded all zero, the reset of the circuit group has been started and the reset state of each circuit concerned will be reported by the appropriate call, circuit or circuit group supervision signal/message. De 1 et e d r Edition of August 15, 1987 CEPT T/S*43-02*E 87 23264
9、34 0008090 O I O000 Subservice field TIS 43-02 E Part III (Q.723+), Page 1 1111 Service indicator Recommendation Q.723 + FORMAT AND CODES O. 1. 1.1. 1.2. EXPLANATORY NOTE The letter ?F? is used through this Recommendation to indicate the message/code that it appears against is ?Faulty? and depending
10、 on the call state, either the call will be failed and the circuit is cleared or the message/code will be discarded and no action will be taken. BASIC FORMAT CHARACTEXISTICS General The messages are carried on the signalling data link by means of signal units, the format of which is described in Rec
11、ommendation 4.703 i i, paragraph 2.2. The signalling information of each message constitutes the signalling information field of the corresponding signal unit and consists of an integral number of octets. It basically contains the label, the heading code and one or more signals and/or indications. S
12、tructure and function of the label are described in para- graph 2.; the heading codes and detailed message formats are described in paragraph 3. This modified specification is for international use only and not intended for national application. The service information octet The service information
13、octet comprises the service indicator and the subservice field. The service indicator is used to associate signalling information with a particular User Part and is only used with message signal units (see Recommendation 4.704 12, paragraph 12.2.). The information in the subservice field permits a d
14、istinction to be made between national and international signalling messages. The format of the sesvice information octet is shown in Figure 114.723 + . 1.3. 1.3.1. 1.3.2. + First bit transmitted Figure 114.723 + , Service information octet. The following codes are used in the fields of the service
15、information octet: (a) The service indicator is coded 11 11. (b) Subservice field is coded 0000. Format principles The user generated information in the signalling information field is, in general, divided into a number of subfields which may be either of fixed or variable length. For a given messag
16、e type identified by a unique message heading the presence of a given subfield may be either mandatory or optional, The various types of subfields are further defined below. Mandatory sirbjelds Subfields which have been declared mandatory for a given message type appear in all messages of that type,
17、 Optional subjields Subfields which have been declared optional for a given message type only appear when required in messages of that type. The presence or absence of each optional field is indicated by the state of a field indicator located in an indicator field, which in this case is a mandatory
18、subfield. .- / 1 1 ! i 1 Edition of August 15, 1987 _- - ,CEPT T/S*43-02*E 87 H 23264/4 Oa0809/ 2 S TIS 43-02 E Part III (Q.723+), Page 2 1.3.3. 1.3.4. 1.3.5. 1.3.6. 1.3.7. 2. 2.1. 2.2. 2.2.1 * Fixed length subjields Subfields which have been declared fixed length for a given message type contain th
19、e same number of bits in all messages of that type. Variable length subjields For subfields which have been declared variable length for a given message type, the number of bits may vary between messages of that type. The size of a variable length subfield is indicated in an immediately preceding fi
20、xed length subfield in terms of predefined unit such as bits, octets or half-octets. Order of subjeld transmission For a given type of message the various types of subfields are transmitted in the following order: (a) mandatory subfields (b) optional subfields Within each of these two classes, the o
21、rder of subfield transmission is, in general, as follows: 1. 2. variable length subfields. Order of bit transmission Within each defined subfield the information is transmitted least significant bit first. Coding of spare bits Spare bits are coded O unless indicated otherwise. fixed length subfields
22、 (with the exception of the indicator field and subfields indicating the size of a variable length subfield), LABEL General The label is an item of information which forms part of every signalling message and is used by the message routing function at Message Transfer Part level 3 to select the appr
23、opriate signalling route and by the User Part function to identify the particular transaction (e.g. the call) to which the message pertains. In general, label information encompasses an explicit or implicit indication of the message source and destination and, depending on the application, various f
24、orms of transaction identification. For messages which are related to circuits, the transaction is conveniently identified by including the corresponding circuit identity in the label. One standard label format is specified (paragraph 2.2.) for international use. Standard label Label format The stan
25、dard label has a length of 40 bits and is placed at the beginning of the signalling information field. The label structure is as shown in Figure 2/Q.723 +. CIC OPC DPC + 12 14 14 First bit transmitted Figure 2/Q.723 + . Standard label structure. The destination point code (DPC) indicates the signall
26、ing point for which the message is intended, while the originating point code (OPC) indicates the signalling point which is the source of the message. The circuit identification code (CIC) indicates one circuit among those directly interconnecting the destination and the originating points. The port
27、ion of the label that consists of the destination point code and originating point code fields and of the four least significant bits of the circuit identification code field corresponds to the standard routing label specified in Recommendation 4.704 121, paragraph 2.2. Edition of August 15, 1987 CE
28、PT T/S*43-02*E 7 232b431.1 0008072 4 TIS 43-02 E Part III (0.723+), Page 3 2.2.2. Destination and Originating point codes The standard label structure requires that each exchange in its role as signalling point is allocated a code from code plans established for the purpose of unambiguous identifica
29、tion of signalling points. The separate code plans will be used for the international signalling network and for different national signalling networks. The principles of code allocation which apply to the international signalling network are in accordance with Recommendation 4.708 8. The destinatio
30、n point code will be the code applicable to the exchange to which the message is sent. The originating point code will be the code applicable to the exchange from which the message is sent. The allocation of circuit identication codes to individual circuits is determined by bilateral agreement and/o
31、r in accordance with applicable predetermined rules. Allocation rules for certain applications are defined below : (a) 2,048 kbit/s digital path 2.2.3. Circuit identiJicntion code For circuits which are derived from a 2,048-kbit/s digital path (Recommendations G.732 17 and G.734 i 81) the circuit id
32、entification code contains in the 5 least significant bits 5 binary representation of the actual number of the time slot which is assigned to the circuit. The remaining bits in the circuit identification code are used, where necessary, to identify one among several systems interconnecting an origina
33、ting and destination point. For circuits which are derived from a 8,448-kbitls digital path (Recommendations G.744 i91 and G.746 20) the circuit identification code contains in the 7 least significant bits an identication of the time slot which is assigned to the circuit. The codes in Table 1/Q.723
34、+ are used. The remaining bits are used, where necessary, to identify one among several systems interconnecting an originating and destination point. (c) Frequency division multiplex (FDM) systems in networks using the 2,048-kbit/s pulse code modulation standard For frequency division multiplex syst
35、ems existing in networks that also use the 2,048-kbit/s pulse code modulation standard, the circuit identification code contains in the 6 least significant bits the identifica- tion of a circuit within a group of 60 circuits carried by 5 basic frequency division multiplex groups which may or may not
36、 be part of the same supergroup. (b) 8,448 kbit/s digital path The codes in Table 2/Q.123 + are used. 0000000 circuit 1 0000001 circuit 2 O01 11 11 circuit 32 0100000 circuit 33 11 11 110 circuit 127 1111 11 1 circuit 128 Table 1/Q.723 + Edition of August 15, 1987 i t - CEPT T/S*43-02*E ? W 2326414
37、0008093 b = TIS 43-02 E Part 111 (0.723+), Page 4 000000 000001 O01 100 001101 O01 110 001111 o 1 O000 010001 o1 1001 011010 o11111 100000 1 O000 1 100110 1001 11 101111 1 10000 110001 110010 11001 1 110100 111111 unallocated circuit 1 circuit 12 circuit 1 circuit 2 circuit 3 unallocated circuit 4 c
38、ircuit 12 circuit 1 circuit 6 unallocated circuit 7 circuit 12 circuit 1 circuit 9 unallocated circuit 10 circuit 11 circuit 12 circuit 1 circuit 12 1st basic (FDM) group 1 5th basic (FDM) group 1 Table 2/Q.723 + 3. MESSAGE FORMATS AND CODES 3.1. General All signal messages contain a heading consist
39、ing of two parts, heading code HO and heading code HI. Code HO identifies a specific message group (see Part II, Recommendation Q.722+ paragraph 3.2.1.) while H1 either contains a signal code or, in case of more complex messages, identifies the format of these messages. The allocation of the HO and
40、H1 code is summarized in Table 3/Q.723 + at the end of this Recommendation. CEPT T/S*43-02*E 87 .I 2326414 0008074 - .I Calling line ident. 3.2. Addit. Addit. Closed routing calling user inform. Party group inform. inform. 3.3. 3.3.1. 3.3.2. TIS 43-02 E Part 111 (Q.723+), Page 5 Heading code HO The
41、heading code HO occupies the 4-bit field following the label and is coded as follows: O000 spare, F O00 1 forward address messages O010 forward Set-up request messages O0 1 1 backward Set-up request messages O 1 O0 successful backward Set-up information messages O 10 1 unsuccessful backward Set-up i
42、nformation messages O 1 1 O call supervision messages O1 11 circuit supervision messages 1000 circuit group supervision messages 1001 Reserved, F Spare, F 1111 Forward address messages The following types of forward address messages are specified and are each identified by a different heading code H
43、1: - Initial address message with additional information - Subsequent address message (with one or more address signals) - Subsequent address message with one (address) signal Deleted Initial address message with additional information The basic format of the initial address message with additional
44、information is shown in Figure 4/Q.723 +. BA Calling access signalling capability 2 FEDCBA Calling party category 0010 Heading code H1 Heading 6 4 4 40 HGFEDCBA I I I LKJIHGFEDCBA I I I Message octet I signals 1 signals I indicators Number of First indicator Address address 8 nx8 4 12 + First bit tr
45、ansmitted nx8 nx8 nx8 40 Figure 4/Q.723 + . Initial address message with additional information. 7 Edition of August 15, 1987 I - - CEPT T/S*43-0Z*E ? 2326434 OOO095 T TfS 43-02 E Part III (Q.723+), Page 6 The following codes are used in the initial address message with additional information: (a) L
46、abel: see paragraph 2. (b) Heading code HO is coded O001 (c) Heading code H1 is coded O010 (d) Calling party category bits F E D C B A 000000 unknown source 000001 operator, language French 000010 operator, language English 000011 operator, language German 000100 operator, language Russian 000101 op
47、erator, language Spanish I 000110 000111 001000 001001 o01010 001011 001100 001101 o01110 available to Administrations for selecting a particular language provided by mutual agreement spare, F ordinary calling subscriber spare, F spare, F test call spare, F 001111 pay phone 010000 111111 (e) Calling
48、 Access Signalling Capability spare, F to bit A: access signalling capabilities indicator O unknown 1 calling access Q.931 bit B: spare & set to O, other coding F bits B A: nature of address indicator (f) Message indicators: O O reserved, F O 1 spare, F 1 O national (significant) number 1 1 internat
49、ional number bits D C: nature-of-circuit indicator O O no satellite circuit in the connection O 1 one satellite circuit in the connection 1 O spare, F 1 1 spare, F O O continuity-check not required O 1 continuity-check required on this circuit 1 O continuity-check performed on a previous circuit 1 1 spare, F O 1 bits F E: continuity-check indicator bit G: echo-suppressor indicator outgoing half echo suppressor not included outgoing half echo suppressor included bit H: reserved, set to O bit I: redirected call indicator O not a redirected call 1
