CEPT T CS 42-05 E-1985 System R2 Signalling Tests Via the European Communications Satellite (ECS) (ETR 253 1996)《经由欧洲通信卫星(ECS)的系统R2线信令测试(ETR 253 1996)》.pdf
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1、CEPT T/CS*42-05*E 5 W 2326434 0004790 H Page 1 TCS42-05 E Recommendation T/CS 42-05 (Nice 1985) SYSTEM R2 SIGNALLING TESTS VIA THE EUROPEAN COMMUNICATIONS SATELLITE (ECS) Recommendation proposed by Working Group T/WG 11 “Switching and Signalling” (CS) Text of the Recommendation adopted by the “Telec
2、ommitiiicatioIis” Commission: “The European Conference of Post and Telecommunications Administrations, consideritig - that the System R2 is at present the preferred signalling system for telephone links via the ECS system, - that Administrations may use either analogue or digital terrestrial links t
3、o access the ECS system, - that new equipment designs which can affect signalling are to be used with the ECS system, - that it is desirable to ensure correct interworking of different implementations of similar equipment, recomrnepids to members of the CEPT intending to employ System R2 signalling
4、via the ECS system, the signalling test procedures specified below.” PREAMBLE This Recommendation has no equivalent CCITT Recommendation. This Recommendation advocates that prior to the introduction of ECS using SS R2, a series of compatibility tests should be performed between Administrations/RPOAs
5、. The major phases of testing recommend are: (a) Testing of the operation of the SS R2 equipment at the ISC. (b) Early compatibility test between Administrations/RPOAs. (c) Performance testing of the digital access link to the earth station from the ISC. (d) Testing of the operation of the ECS line
6、signalling channel. (e) Testing of the operation of SS R2 via a looped circuit at the earth station. (f) Testing of the operation of SS R2 via a circuit looped via the ECS. (g) A programme of tests with partner countries via the ECS. A list of proposed SS R2 tests is included. O 1. INTRODUCTION New
7、equipment designs, such as TDMA/DSI earth stations, digital line systems, transmultiplexers and digital ISC equipment, all of which can affect signalling, may be used on connections via the European Communications Satellite (ECS). To ensure smooth integration of signalling equipment and correct inte
8、rworking with other Administrations using similar equipment developed by different manufacturers, it is proposed that a series of signalling tests be carried out before entering service via ECS. The proposals given below provide details of such tests which may be utilised by Administrations as appro
9、priate. It is recognised that, because of different equipment implementations, some of the proposed test arrange- ments may not be met by, or, may not fully meet individual Administrations requirements. In such cases, Administrations should make their own arrangements bearing in mind the testing pri
10、nciples proposed. Edition of September 15, 1986 TICC 42-05 E Page 2 Proposals are made for the early proving of compatibility of signalling equipment by utilising analogue circuits between the ISCs concerned, before the overall digital transmission path between participating ISCs may be available. I
11、t is recommended that Administrations undertake these early tests as appropriate, in order to minimise problems of incompatibility that could otherwise arise later. The testing of inter-register signalling via the satellite should embrace the use of all possible inter-register signals. It would be u
12、seful, for further study of the problem, if facilities could be made available to provide information relating to the duration times of short transmission breaks causing receipt of split digits. Signals and procedures referred to in this recommendation are described and detailed in the following doc
13、uments, to which reference should be made as appropriate: - Recommendation TICS 42-02. System R2 line signalling, analogue version; - Recommendation TICS 42-03. System R2 line signalling, digital versions; - Recommendation TICS 42-04. System R2 line signalling conversion; - Recommendation TICS 42-09
14、. Signalling and circuit supervision via ECS; - CCITT Recommendations 4.440-4.480. System R2 inter-register signalling and procedures; - Eutelsat document ECS/C11-17 Rev. 1. TDMAIDSI system specijcations. 2. SIGNALLING TEST REQUIREMENTS Figure 1 shows the various arrangements of access links and sig
15、nalling equipment that may be employed for ECS. Proposed staged signalling tests for each of the 3 arrangements are given below. 2.1. Arrangement A (a) Check the operation of System R2 digital equipment at the ISC. These tests should form part of the normal acceptance tests for new equipment and wil
16、l be agreed between Administrations and equipment contractors. Back to back tests between outgoing and incoming equipment at the ISC should be included. The use of System R2 digital line signalling terminations at analogue ISCs will be covered by these tests. (b) Early proving tests may be conducted
17、 as described in Section 3. It is essential that interworking between different manufacturers equipment is undertaken. (c) Check the performance of the digital link between the ISC and earth station. This would normally be regarded as being part of the acceptance testing necessary for new transmissi
18、on links. (d) As part of the overall acceptance test program for the earth station it is envisaged that interworking between Time Slot 16 and the Line Signalling Channel (LSC) will be checked to ensure that correct translation occurs in accordance with Table 3 of Recommendation T/CS 42-09. (e) If po
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