1、INTERNATIONAL TELECOMMUNICATION UNION)45G134 TELECOMMUNICATIONSTANDARDIZATION SECTOROF ITU).4%2.!4)/.!,G0G0!.!,/5%G0G0#!22)%2G0G03934%-3%.%2!,G0G0#(!2!#4%2)34)#3G0G0#/-/.G0G04/G0G0!,!.!,/5%G0G0#!22)%2G1342!.3-)33)/.G0G03934%-3-!+%G1350G0G0/ further amended)In the international telephone network, pro
2、vision must be made for the interconnection of various sorts ofcarrier-transmission systems using symmetric cable pairs, open-wire lines, coaxial cable pairs or radio-relay links. It isthus desirable for the carrier equipment used in these various systems, and which is not confined to a particular s
3、ort ofline, to meet general CCITT recommendations.Basically, these equipments comprise translating equipments and through-connection filters.1 Translating equipmentsThese equipments are classified below according to the procedure used to make up the large-capacity systemsfrom the basic supergroup.Tw
4、o procedures are in use:Procedure 1: the mastergroup and supermastergroup procedure;Procedure 2: the 15-supergroup assembly procedure; their use is described in the Recommendations concerningthe various line systems.For international links, procedure 2 can be used above 4 MHz only by agreement betwe
5、en the Administrationsconcerned, including the agreement of the Administration(s) of the transit country or countries, if any.In the Recommendations, the names of the equipments defined above are also used for equipments whichtranslate a basic group, supergroup or mastergroup or a basic (No. 1) 15-s
6、upergroup assembly into the line-frequencyband and vice versa.The translating equipments used in procedure 1 are:- channel-translating equipment, for translating the audio-frequency band into the basic group and viceversa (see Recommendations G.232, G.234 1 and G.235);- group-translating equipment f
7、or translating five basic groups into the basic supergroup and vice versa;- supergroup-translating equipment for translating five basic supergroups into the basic mastergroup andvice versa;- mastergroup-translating equipment for translating three basic mastergroups into the basicsupermastergroup and
8、 vice versa;- supermastergroup-translating equipment for translating the basic supermastergroup into the line-frequencyband and vice versa.Note - Figure 1/G.211, a) and b) recapitulates the basic frequency bands used in procedure 1; the through-connection possibilities described in Recommendation G.
9、242 are provided for in these bands.2 Fascicle III.2 - Rec. G.211c) Frequency bands occupied by basic 15-supergroup assembly and by 15-supergroup assembly No. 3FIGURE 1/G.211Frequency bands occupied by basic groups, supergroups, mastergroups and supermastergroups, by the basic 15-supergroupassembly
10、and the 15-supergroup assembly No. 3, together with the associated pilotsFascicle III.2 - Rec. G.211 3The translating equipments used in procedure 2 are:- channel-translating equipment and group-translating equipment, as defined for procedure 1;- supergroup-translating equipment for translating 15 b
11、asic supergroups into the basic assembly No. 1 of 15basic supergroups and vice versa;- 15-supergroup assembly equipment for translating basic assembly No. 1 of 15 supergroups into thefrequency band of the 15-supergroup assembly No. 3 and vice versa;- supermastergroup-translating equipment for transl
12、ating 15-supergroup assembly No. 3 into theline-frequency band and vice versa.Note 1 - Figure 1/G.211, a) and c) gives a recapitulation of the basic frequency bands used in procedure 2 inwhich the through-connection facilities described in Recommendation G.242 are provided.Note 2 - The frequency ban
13、d occupied by 15-supergroup assembly No. 3 (8620 to 12 336 kHz) lies within thefrequency band occupied by the basic supermastergroup (8516 to 12 388 kHz). The equipments which are used fortranslating into the line-frequency band and vice versa may therefore be the same.For this reason, these equipme
14、nts carry the same name of “supermastergroup-translating equipment“.2 Through-connection filtersThrough-group, supergroup, etc., filters and direct through-connection filters (see Recommendation G.242).The equipment listed under the preceding sentence and 1 above can be interconnected for setting up
15、 longgroups, supergroups, etc., over several carrier systems. An example of such a link is shown in Figure 2/G.211 togetherwith the expressions defined below that are recommended for describing the various parts of a circuit on such a group orsupergroup, etc.Figure 3/G.211 refers to definitions 3.2
16、to 3.11 below.Those of the following definitions that concern “links“ or “sections“ apply, unless otherwise stated, to thecombination of both directions of transmission. A distinction between the two directions of transmission may, however,be necessary in the case of unidirectional, multiple-designa
17、tion “links“ or “sections“ set up over multiple-destinationtelecommunication satellite systems.4 Fascicle III.2 - Rec. G.211CTE = channel-translating equipment (translation of the audio band into the basic group and vice versa)GTE = group-translating equipment (translation of the basic group into th
18、e basic supergroup and vice versa)STE = supergroup-translating equipment (translation of the basic supergroup into the line frequency on coaxial cable, and vice versa)GME = group-modulating equipmentDLF = direct line filterTSF = through-supergroup filterTGF = through-group filterRDF = repeater distr
19、ibution frameGDF = group distribution frameSDF = supergroup distribution frameNote - This diagram shows only one direction of transmission.FIGURE 2/G.2113 Definitions3.1 line link (using symmetric pairs coaxial pairs, etc.)F: liaison en ligne ( paires symtriques, paires coaxiales, etc.)S: enlace en
20、lnea (de pares simtricos, de pares coaxiales, etc.)A transmission path, however provided, together with all the associated equipment, such that the bandwidthavailable, while not having any specific limits, is effectively the same throughout the length of the link.Within the link there are no direct
21、filtration points nor any through-connection points for groups, supergroups,etc., and the ends of the link are the points at which the band of line frequencies is changed in some way or other.3.2 group linkF: liaison en groupe primaireS: enlace en grupo primarioThe whole of the means of transmission
22、 using a frequency band of specified width (48 kHz) connecting twoterminal equipments, for example channel translating equipments, wideband sending and receiving equipments(modems, etc.). The ends of the link are the points on group distribution frames (or their equivalent) to which theterminal equi
23、pments are connected.It can include one or more group sections.Fascicle III.2 - Rec. G.211 53.3 supergroup linkF: liaison en groupe secondaireS: enlace en grupo secundarioThe whole of the means of transmission using a frequency band of specified width (240 kHz) connecting twoterminal equipments, for
24、 example group translating equipments, wideband sending and receiving equipments (modems,etc.). The ends of the link are the points on supergroup distribution frames (or their equivalent) to which the terminalequipments are connected.It can include one or more supergroup sections.3.4 mastergroup lin
25、kF: liaison en groupe tertiaireS: enlace en grupo terciarioThe whole of the means of transmission using a frequency band of specified width (1232 kHz) connecting twoterminal equipments, for example supergroup translating equipments, wideband sending and receiving equipments(modems, etc.). The ends o
26、f the link are the points on mastergroup distribution frames (or their equivalent) to which theterminal equipments are connected.It can include one or more mastergroup sections.Note - As translating procedure 2 described under 1 above does not enable mastergroups to be set up, the“mastergroup link“
27、concept applies only in procedure 1.3.5 supermastergroup linkF: liaison en groupe quaternaireS: enlace en grupo cuaternarioThe whole of the means of transmission using a frequency band of specified width (3872 kHz) connecting twoterminal equipments, for example mastergroup translating equipments, wi
28、deband sending and receiving equipments(modems, etc.). The ends of the link are the points on supermastergroup distribution frames (or their equivalent) towhich the terminal equipments are connected.It can include one or more supermastergroup sections.Note - As the frequency band occupied by 15-supe
29、rgroup assembly No. 3 (8620 to 12 336 kHz) lies within thefrequency band occupied by the basic supermastergroup (8516 to 12 388 kHz), the basic supermastergroup link cantransmit one supermastergroup or an assembly of 15 supergroups.3.6 15-supergroup assembly linkF: liaison en assemblage de 15 groupe
30、s secondairesS: enlace en agregado de 15 grupos secundariosThe whole of the means of transmission using a frequency band of specified width (3716 kHz) connecting twoterminal equipments (supergroup modems permitting the setting-up of a 15-supergroup assembly). The ends of the linkare the points on 15
31、-supergroup assembly distribution frames (or their equivalent) to which the terminal equipments areconnected.It can include one or more 15-supergroup assembly sections.Note - The notion of 15-supergroup assembly link relates to translating procedure 2 mentioned in 1 above. Itis the equivalent of the
32、 “supermastergroup link“ concept of the translating procedure 1 (900 telephone channels).6 Fascicle III.2 - Rec. G.2113.7 group sectionF: section de groupe primaireS: seccin de grupo primarioThe whole of the means of transmission using a frequency band of specified width (48 kHz) connecting twoconse
33、cutive group distribution frames (or equivalent points) via at least one line link.3.8 supergroup sectionF: section de groupe secondaireS: seccin de grupo secundarioThe whole of the means of transmission using a frequency band of specified width (240 kHz) connecting twoconsecutive supergroup distrib
34、ution frames (or equivalent points) via at least one line link.3.9 mastergroup sectionF: section de groupe tertiaireS: seccin de grupo terciarioThe whole of the means of transmission using a frequency band of specified width (1232 kHz) connecting twoconsecutive mastergroup distribution frames (or eq
35、uivalent points) via at least one line link.Note - As translating procedure 2 described in 1 above does not enable mastergroups to be set up, the“mastergroup section“ concept applies only in procedure 1.3.10 supermastergroup sectionF: section de groupe quaternaireS: seccin de grupo cuaternarioThe wh
36、ole of the means of transmission using a frequency band of specified width (3872 kHz) connecting twosupermastergroup distribution frames (or equivalent points) via at least one line link.Note - As the frequency band occupied by 15-supergroup assembly No. 3 (8620 to 12 336 kHz) lies within thefrequen
37、cy band occupied by the basic supermastergroup (8516 to 12 388 kHz), the supermastergroup section cantransmit one supermastergroup or an assembly of 15 supergroups.Fascicle III.2 - Rec. G.21178 Fascicle III.2 - Rec. G.2113.11 15-supergroup assembly sectionF: section dassemblage de 15 groupes seconda
38、iresS: seccin de agregado de 15 grupos secundariosThe whole of the means of transmission using a frequency band of specified width (3716 kHz) connecting twoconsecutive 15-supergroup assembly distribution frames (or equivalent points) via at least one line link.Note 1 - Same note as for definition 3.
39、6 above.Note 2 - In a country which uses procedure 1, a 15-supergroup assembly can be through-connected withoutdifficulty at the supermastergroup distribution frame. In this case, the 15-supergroup assembly is through-connected toposition 3 (8620-12 336 kHz) instead of position 1 (312-4028 kHz) as r
40、equired by the definition of the through-connection point of such an assembly (see Recommendation G.242, 6). This through-connection point does nottherefore correspond to this definition and is not at the end of a 15-supergroup assembly section.3.12 through-group connection pointF: point de transfer
41、t de groupe primaireS: punto de transferencia de grupo primarioWhen a group link is made up of several group sections, they are connected in tandem by means of through-group filters at points called through-group connection points.3.13 through-supergroup connection pointF: point de transfert de grou
42、pe secondaireS: punto de transferencia de grupo secundarioWhen a supergroup link is made up of several supergroup sections, they are connected in tandem by means ofthrough-supergroup filters at points called through-supergroup connection points.3.14 through-mastergroup connection pointF: point de tr
43、ansfert de groupe tertiaireS: punto de transferencia de grupo terciarioWhen a mastergroup link is made up of several mastergroup sections, they are connected in tandem by means ofthrough-mastergroup filters at points called through-mastergroup connection points.3.15 through-supermastergroup connecti
44、on pointF: point de transfert de groupe quaternaireS: punto de transferencia de grupo cuaternarioWhen a supermastergroup link is made up of several supermastergroup sections they are connected in tandemby means of through-supermastergroup filters at points called through-supermastergroup connection
45、points.Fascicle III.2 - Rec. G.211 93.16 through-15-supergroup assembly connection pointF: point de transfert dassemblage de 15 groupesS: punto de transferencia de agregado de 15 grupos secundariosWhen a 15-supergroup assembly link is made up of several 15-supergroup assembly sections, these section
46、s areinterconnected in tandem by means of through-15-supergroup assembly filters at points called through-15-supergroupassembly connection points.As an alternative when the 15-supergroup assembly equipment provides sufficient filtering (corresponding tothe definition of through-connection equipments
47、 - see Recommendation G.242, 6) through-15-supergroup assemblyfilters can be dispensed with.Note - When a 15-supergroup assembly is connected by means of through-supermastergroup filters, the point ofinterconnection is the through-supermastergroup connection point and not a through-15-supergroup ass
48、emblyconnection point.3.17 regulated line section (symmetric pairs, coaxial pairs or radio-relay links, etc.)F: section de rgulation de ligne ( paires symtriques ou coaxiales ou sur faisceau hertzien, etc.)S: seccin de regulacin de linea (de pares simtricos o coaxiales, o por radio-enlaces, etc.)In
49、a carrier transmission system, a line section on which the line-regulating pilot or pilots are transmitted fromend to end without passing through an amplitude-changing device peculiar to the pilot or pilots.3.18 main repeater stationF: station principale de rpteursS: estacin principal de repetidoresA station, always the terminal of a line link (see definition 3.1 above), where direct line filtering ordemodulation or both together may take place. As a consequence, in such a station there are equalizers and it is possibleto find points which are of uni
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