1、bertragungs- und Multiplextechnik (TM) Funkspezifische Funktionsblcke fr die bertragung von Mx STM-N Englische Fassung ETS 300635 : 1996 Synchrone Digitalhierarchie (SDH) DIN - ETS 300635 STD-DIN DIN ETS 3UUb35-GERM 1777 W 27744Lib Ob5813b LT5 D STANDARD ETS 300 635 October 1996 Source: ETSI TC-TM R
2、eference: DMM-04028 ICs: 33.04020 Key words: SDH, radio, transmission Transmission and Multiplexing (TM); Synchronous Digital Hierarchy (SDH); Radio specific functional blocks for transmission of Mx STM-N ETSI European Telecommunications Standards Institute ETSI Secretariat Postal address: F-O6921 S
3、ophia Antipolis CEDEX - FRANCE Office address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE X.400: c=fr, a=atlas, petsi, s=secretanat - Internet: secretatiatetsi.fr Tel.: +33 4 92 94 42 O0 - Fax: +33 4 93 65 47 16 Copyright Notification: No part may be reproduced except as authorize
4、d by written permission. The copyright and the foregoing restriction extend to reproduction in all media. Q European Telecommunications Standards Institute 1996. Ail tights reserved. STD-DIN DIN ETS 300b35-ERM 1777 277444b Ob519137 031 = Page 2 ETS 300 635: October 1996 Whilst every care has been ta
5、ken in the preparation and publication of this document, errors in content, typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to “ETSI Editing and Committee Support Dept.“ at the address shown on the title page. STD-DIN DIN ETS 3OOb35-GERM 1797 - 277qq
6、Llb Ob58138 T78 Page 3 ETS 300 635: October 1996 Contents Foreword . 5 1 Scope 7 2 Normative references 7 3 Abbreviations . 8 4 Generalized fundional block diagram . 9 4.1 4.1.1 Signal flow from 6 to R 12 4.1.2 Signal flow from R to 6 13 4.1.3 Radio OveMead Access (ROHA) 14 Radio Protection Switch (
7、RPS) 15 4.3.1 Signal flow . 17 4.3.2 Additional requirement on the signal flow from XT (tributary side) to XL (line side) . 18 4.3.3 Additional requirement on the signal flow from XL (line side) to XT (tributaiy side) 18 4.3.4 Switching initiation criteria . 19 4.3.4.1 Lockout 19 4.3.4.2 Forced swit
8、ch . 19 4.3.4.3 Autoswitch signal fail . 19 4.3.4.4 Autoswitch HBER and LBER . 20 4.3.4.5 Autoswitch EW 20 4.3.4.6 Manual switch 20 4.3.4.7 Exercise . 20 4.3.5 Switching time . 20 4.3.6 Switch restore 20 4.3.6.1 Forced restore . 20 4.3.6.2 Automatic forced restore . 21 4.3.6.3 Automatic switch resto
9、re . 21 SDH Radio Synchronous Physical Interface function (RSPI) 10 Application to the transmission of Mx STM-N . 14 4.2 4.3 5 Requirement of Operation and Maintenance (O and that: - ETS 300 417 l defines a library of basic building blocks and a set of rules, by which they may be combined to describ
10、e an SDH equipment; this ETS uses the methodology specified in ITU-T Recommendation G.783 7, in order to give a generic description of a SDH DRRS. However in informative annex C some functional description in ETS 300 417 l styie has been included in order to facilitate a future enhancement of radio
11、specific functionality description with this methodology. This ETS defines: - the functional blocks specific to SDH DRRS. This ETS does not define: - - - - - the information model for radio relay network elements; the protocol stack to be used for message communication; the network level management
12、processes; the functional block already defined by ITU-T Recommendation G.783 7 and ETS 300 417 i; the radio specific management of performance monitoring requirements. The equipment functionality is consistent with SDH multiplexing structure given in ETS 300 147 15. Equipment developed prior to thi
13、s ETS may not comply in all details with this ETS. 2 Normative references This ETS incorporates, by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the texl and the publications are listed hereafter. For dated referenc
14、es, subsequent amendments to or revisions of any of these publications apply to this ETC only when incorporated in it by amendment or revision. For undated references, the latest edition of the publication referred to applies. ETS 300 41 7: “Transmission and Multiplexing (TM); Generic functional req
15、uirements for Synchronous Digital Hierarchy (SDH) transmission equipment“. ETS 300 304 (1 994): “Transmission and Multiplexing (TM); Synchronous Digital Hierarchy (SDH) information model for the Network Element (NE) view“. ITU-R Recommendation F.750: “Architectures and functional aspects of radio-re
16、lay systems for SDH based networks“. ITU-T Recommendation G.773: “Protocols suites for Q-interfaces for management of transmission systems“. ITU-T Recommendation G.781: “Structure of Recommendations on equipment for the Synchronous Digital Hierarchy (SDH)“. Previous page is blank STD.DIN DIN ETS 3Cb
17、35-GERM 1997 279444b b58L42 4T7 m Page 8 ETS 300 635: October 1996 181 191 11 o1 ITU-T Recommendation G.782: “Types and general characteristics of Synchronous Digital Hierarchy (SDH) equipment“. ITU-T Recommendation G.783: “Characteristics of Synchronous Digital Hierarchy (SDH) equipment functional
18、blocks“. ITU-T Recommendation G.784: “Synchronous Digital Hierarchy (SDH) management“. ITU-T Recommendation G.803: “Architectures of transport networks based on the Synchronous Digital Hierarchy (SDH)“. ITU-T Recommendation G.831: “Management capabilities of transport networks based on the Synchrono
19、us Digital Hierarchy (SDH)“. ITU-T Recommendation M.301 O: “Principles for a telecommunications management network“. 11 21 ITU-T Recommendation M.60: “Maintenance Terminology and definitions“ (1 31 11 41 11 51 ITU-T Recommendation (2.81 1 : “Lower layer Protocol profiles for the Q3 in te rfa ce“. IT
20、U-T Recommendation (2.812: “Upper layer Protocols profile for the Q3 interface“. ETS 300 147 (1 995): “Transmission and Multiplexing (TM); Synchronous Digital Hierarchy (SDH) Multiplexing structure“. 16l ITU-T Recommendation G.707: “Synchronous Digital Hierarchy bit rates“. i 71 ITU-T Recommendation
21、 G.708: “Network node interface for the Synchronous Digital Hierarchy“. 11 81 ITU-T Recommendation G.709: “Synchronous multiplexing structure“. 3 Abbreviations For the purposes of this ETS, the following abbreviations apply: AIS AP ATPC BER CMIP CMIS CP CTP DRRS EW GTP HPA IF IA 10s LOF LPA MOC MSP
22、MSOH NE Alarm Indication Signal Access Point Automatic Transmit Power Control Bit Error Rate Common Management Information Protocol Common Management Information Sewice Connection Point Connection Termination Point Digital Radio Relay System Early Warning Group Termination Point Higher order Path Ad
23、aptation Intermediate Frequency: frequency(s) other than RF used for the purpose of implementation depending functions (e.g. easier filtering) Indirect Adapter Intra-Office Section Loss Of Frame Lower order Path Adaptation Managed Object Class Multiplex Section Protection Multiplex Section OverHead
24、Network Element STD-DIN DIN ETS 300b35-GERM 2797 2774Lillb 0b5811i3 335 Page 9 ETS 300 635: October 1996 O Media specific or RFCOH bytes (whichever is applicable) interface for Radio Synchronous Physical Interface (RSPI) usage; Media specific or RFCOH bytes (whichever is applicable) interface for Ra
25、dio Protection Switching (RPS) usage; RPS Reference point (Tributary side); RPS Reference point (Line side); see ITU-T Recommendations G.782 SI and G.783 7. The RPS functional block comprises a connection type function which, for an implementation dependent purpose, can be inserted in between any ot
26、her functional block to perform specific (n + m) line protection for the radio section. It has the same “x“ inputloutput interfaces which are always compatible with any interface where it may be inserted, namely reference points B, C, D, E or F, however it should be noted that, when looked from the
27、point of view of ETS 300 417 l methodology, RPS placed in different network layer will result in different functionality (see informative annex A for details). Figure 1 : Generalized SDH-DRRS logical and functional block diagram 4.1 SDH Radio Synchronous Physical Interface function (RSPI) The RSPI f
28、unction provides the interface between the radio physical medium at reference point R and the Regenerator Section Termination (RST) function at reference point B. Data at R is a Radio Frequency (RF) signal containing an STM-N signal with non-standardized use of Section Overhead (SOH) media dependent
29、 bytes (provided by ITU-T Recommendations G.707 16 and G.70817D and (if used) an additional arbitrary RFCOH. Therefore, in accordance with ITU-R Recommendation F.750 3, mid-air interconnectivity between transmitter and receiver of different vendors is not required. The information flows associated w
30、ith the RSPI function are described with reference to figure 2. This functional block is, therefore, expanded in figure 3. STD-DIN DIN ETS 300b35-GERM 1797 2791144b Ob58145 108 Page 11 ETS 300 635: October 1996 K50 is an interface for any radio specific control and monitoring use (e.g. Automatic Tra
31、nsmit Power Control (ATPC) making use of the media specific bytes of Regenerator Section OverHead (RSOH) or of RFCOH extracted through reference points U1 or U50 respectively and made available by the Radio OverHead Access (ROHA) functional block. The possible functional modelling with ETS 300 41 71
32、 methodology of the RSOH access for K50 interface is shown in figure C5 annex C (informative). K50 U50 Reference point R I I Reference point B Receive los of Signal Data Timing RF In Figure 2: RSPI functional block The RSPI functions are subdivided into transmit (source) and receive (sink) functions
33、; a second level of decomposition refinement is the splitting of the transmit and receive functions into two smaller sub blocks, as shown in figure 3. These are: - transmit function: modulation function; TX function: receive function: demodulation function; RX function. These functions are described
34、 as follows: - the modulation function performs all the processing needed to transfer the STM-N data signal at reference point B into a suitable Intermediate Frequency (IF) or RF signal (whichever is applicable), including scrambling (additional to that provided by RST function) and optionally, chan
35、nel-coding and RFCOH insertion; - the TX function represents the process of power amplifying the signal, coming from the modulation function, filtering and optionally, up converting from the modulation function for presentation at reference point R; - the RX function represents any signal processing
36、 between the receiver input at reference point RI and the demodulation function input. The signal processing performed by the RX function also includes any diversity of reception arrangement, which would be represented as an equipment redundancy by multiple receivers (and if required demodulators) w
37、ithin a single receive function; - the demodulation function represents any process (including propagation countermeasures e.g. equalizer and Cross Polar Interference Canceller (XPIC) of converting an IF or RF signal (whichever is applicable), into a fully formatted STM-N data signal for presentatio
38、n at reference point B. The demodulation process includes the functions of filtering, timing recovery and descrambling, and may optionally include RFCOH extraction and propagation countermeasures, e.g. equalizer, XPIC. error correction. - STD-DIN DIN ETS 300b35-GERM 1997 279444b Ob58L4b 044 W Page 1
39、2 ETS 300 635: October 1996 I I eduiaiion, Rx 4; Fundion Fundion Figure 3: RSPI functional block (detail) I Given that the RSPI includes modulation and demodulation functions, it performs a regeneration of the signal in the DRRS repeater. As a consequence, when the network provider requires that rad
40、io repeaters behaved and were managed like SDH regenerators, the RSPI function shall be always used in conjunction with a Regenerator Section Termination (RST) function in order to perform SDH functionalities; the opposite case is not in the scope of this ETS. I 4.1.1 Signal flow from 8 to R Data fl
41、ow at B is the fully formatted STM-N data as specified in ITU-T Recommendations G.707 16, G.708 17 and G.709 18. Data is presented together with associated timing at B by the RST function. The RSPI function multiplexes these data together with the RFCOH (if used) and adapts them for transmission ove
42、r the RF medium (by means of a suitable modulation format, carrier frequency and output power) and presents it at R. Data for inclusion in RFCOH (if used) are inserted at reference point U50. Radio specific managing data (e.g. ATPC increase/decrease power request from the far end receiver function t
43、o control the local transmitter function) will be shown at K50 from functional block ROHA, which has provided proper extraction from the media specific byte of RSOH or from RFCOH through reference point U1 or U50 respectively (see ROHA functional block description). Indications related to the physic
44、al status of the interface shall be reported at S50 to the Synchronous Equipment Management Function (SEMF) functional block. STDmDIN DIN ETS 300b35-GERM 1777 277444b Ob58147 TBO Page 13 ETS 300 635: October 1996 Requirements of Operation and Maintenance (O - PSECh#: (Protection Switching Events for
45、 channel 1 n). This indication reports the number of switching events for channel number # in a suitable time base. However this parameter is for future study; - FPRECh#: (Failed Protection Switching Events for channel 1 n). This indication reports the number of failed switching events for channel n
46、umber # in a suitable time base. However this parameter is for future study; - SWITCH STANS: This indication reports the situation of alarm and commands active on the RPS; - CHANNEL STATUS: This indication reports RPS request/failure (see subclause 3.3.2, switching initiation criteria) condition act
47、ive on channel #; where the symbol # refers to the channel number identifier (# = 1 n or 1 m). STD-DIN DIN ETS 300b35-GERM 1777 2774Li4b Ob58151 401 m Page 17 ETS 300 635: October 1996 Reference point XT K51 Reference point XL Working 1 O O O O Working n Occasional Tiafic 1 O O O Occasional Trafic r
48、n I Working 1 -. O Radio Protection Switch RPS O O O Working n Protection 1 O o O _- Pi iJ ) Protection m Figure 5: RPS functional block 4.3.1 Signal flow The RPS function provides a connection matrix process not affecting the charactaristic information of the signal applied at reference points XT a
49、nd XL respectively (see informative annex D for implementation details). The set of input and output ports is divided into two subsets, each containing both input and output ports XLine (XL) and X Tributary (XT) as shown in figures5 and 6. This connection matrix allows interconnectivity as shown in table 1. (W i, w, O, Oj, Pi, Pj ) Figure 6: Connection matrix for RPS STD.DIN DIN ETS 300b35-GERM 1797 H 279Li44b Ob58152 348 m Page 18 ETS 300 635: October 1996 The signals associated with the reference points XT and XL respedively are: Tributary
