1、STANDARD ETS 300 635 October 1996 Source: ETSI TC-TM Reference: DETTM-04028 ICs: 33.040.20 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 Stand
2、ards Institute ETSI Secretariat Postal address: F-O6921 Sophia Antipolis CEDEX - FRANCE Office address: 650 Route des Lucioles - Sophia Antipoiis - Valbonne - FRANCE X.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: secretariat Q etsi.fr Tel.: +33 4 92 94 42 O0 - Fax: +33 4 93 65 47 16 Copyrig
3、ht Notification: No part may be reproduced except as authorized by written permission. The copyright and the foregoing restriction extend to reproduction in all media. O European Telecommunications Standards institute 1996. All rights reserved. ETSI ETS*300*635 96 H 3400855 OL4LL38 I147 Page 2 ETS 3
4、00 635: October 1996 Whilst every care has been taken 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 ti
5、tle page. ETSI ETS*300*635 96 3400855 OL4LL39 083 Page 3 ETS 300 635: October 1996 Contents Foreword . 5 1 Scope 7 2 Normative references 7 3 Abbreviations . 8 4 Generalized functional block diagram . 9 4.1 SDH Radio Synchronous Physical Interface function (RSPI) 10 4.1.1 Signal flow from B to R 12
6、4.1.2 Signal flow from R to B 13 4.1.3 Application to the transmission of Mx STM-N . 14 Radio OverHead Access (ROHA) 14 Radio Protection Switch (RPS) 15 4.3.2 4.3.3 4.3.4 4.2 4.3 4.3.1 Signal flow . 17 (line side) . 18 (tributary side) 18 Switching initiation criteria . 19 4.3.4.1 Lockout 19 4.3.4.2
7、 Forced switch . 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 Switching time . 20 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
8、re . 21 Additional requirement on the signal flow from XT (tributary side) to XL Additional requirement on the signal flow from XL (line side) to XT 4.3.5 4.3.6 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 w
9、hich they may be combined to describe 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 style has been included in order to facil
10、itate a future enhancement of radio 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 communic
11、ation: the network level management processes; the functional block already defined by ITU-T Recommendation G.783 7 and ETS 300 417 l; the radio specific management of performance monitoring requirements. The equipment functionality is consistent with SDH multiplexing structure given in ETS 300 147
12、15. Equipment developed prior to this ETS may not comply in all details with this ETS. 2 Normat ive references This ETS incorporates, by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are
13、 listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this ETS only when incorporated in it by amendment or revision. For undated references, the latest edition of the publication referred to applies. 131 41 151 ETS 300 417: “Transmissio
14、n and Multiplexing (TM): Generic functional requirements 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: “A
15、rchitectures and functional aspects of radio-relay 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 (SD
16、H)“. ETSI ETS*300*b35 b 3400855 OL4LL44 440 m Page 8 ETS 300 635: October 1996 161 171 91 1111 ITU-T Recommendation G.782: “Types and general characteristics of Synchronous Digital Hierarchy (SDH) equipment“. ITU-T RecommendationG.783: “Characteristics of Synchronous Digital Hierarchy (SDH) equipmen
17、t functional 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
18、the Synchronous Digital Hierarchy (SDH)“. ITU-T Recommendation M.301 O: “Principles for a telecommunications management network“. 1121 ITU-T Recommendation M.60: “Maintenance Terminology and definitions“ 11 31 11 41 11 51 ITU-T Recommendation Q.811: “Lower layer Protocol profiles for the Q3 in terfa
19、ce“. ITU-T Recommendation Q.812: “Upper layer Protocols profile for the Q3 in terface“. ETS 300 147 (1 995): “Transmission and Multiplexing (TM); Synchronous Digital Hierarchy (SDH) Multiplexing structure“. 161 ITU-T Recommendation G.707: “Synchronous Digital Hierarchy bit rates“. 11 71 ITU-T Recomm
20、endation G.708: “Network node interface for the Synchronous Digital Hierarchy“. I81 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 MO
21、C MSP MSOH NE Alarm Indication Signal Access Point Automatic Transmit Power Control Bit Error Rate Common Management Information Protocol Common Management Information Service Connection Point Connection Termination Point Digital Radio Relay System Early Warning Group Termination Point Higher order
22、Path Adaptation Intermediate Frequency: frequency) 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 Over
23、Head Network Element ETSI ETS*300*635 96 3400855 OL4LL45 387 = 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 Radio Protection Switching (RPS) usage; RPS
24、Reference point (Tributary side); RPS Reference point (Line side); see ITU-T Recommendations G.782 6 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 other functional block to perform specific (n
25、 + 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 point of view of ETS 300 417 l methodology,
26、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 function provides the interface between the r
27、adio 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 bytes (provided by ITU-T Recommendations G.
28、707 16 and G.708 1171) 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 with the RSPI function are described with
29、reference to figure 2. This functional block is, therefore, expanded in figure 3. ETSI ETS*300*b35 96 3400855 0141147 L5T Page 11 ETS 300 635: October 1996 K50 is an interface for any radio specific control and monitoring use (e.g. Automatic Transmit Power Control (ATPC) making use of the media spec
30、ific 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 methodology of the RSOH access for K50 interface is sh
31、own in figure C5 annex C (informative). K50 U50 Reference point R I I Reference point B Ti: Fj RSP, rw RFout Receive loss of Signal Timing 4- Data 4 RFln Figure 2: RSPI functional block The RSPI functions are subdivided into transmit (source) and receive (sink) functions; a second level of decomposi
32、tion 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 as follows: - the modulation
33、 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, channel-coding and RFCOH insertio
34、n; - 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 between the receiver input a
35、t reference point R, 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) within a single receive functi
36、on; - the dernodulation 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 presentation at reference point B. The
37、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. ETSI ETS*300*635 96 3400855 0141248 O96 l * I Page 12 ETS 300 635: October 1996 , Demodulat
38、ion. RX 04 Function , I RSPI I nFail lossOlSignal(rx) I 1 I I demoduIatiwiFaii demLOS I Figure 3: RSPI functional block (detail) 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 provi
39、der requires that radio 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. 4.1.1 Signal flow
40、from B to R Data flow 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 f
41、or transmission over 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
42、receiver function to 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 re
43、lated to the physical status of the interface shall be reported at S50 to the Synchronous Equipment Management Function (SEMF) functional block. ETSI ETS*300*635 96 3400855 0141149 T22 Page 13 ETS 300 635: October 1996 Requirements of Operation and Maintenance (O - PSECh#: (Protection Switching Even
44、ts for 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 cha
45、nnel number # in a suitable time base. However this parameter is for future study; - SWITCH STATUS: This indication reports the situation of alarm and commands active on the RPS; - CHANNEL STATUS: This indication reports RPS requesvfailure (see subclause 3.3.2, switching initiation criteria) conditi
46、on active on channel #; where the symbol # refers to the channel number identifier (# = 1 n or 1.m). ETSI ETS*300*635 b 3400855 OL4LL53 453 Page 17 ETS 300 635: October 1996 Reference point XT K5 1 Reference point XL Working 1 o Working n Occasional Trafic 1 o e Occasional Trafic m Working 1 o e Wor
47、king n Protection 1 o O Protection m Figure 5: RPS functional block 4.3.1 Signal flow The RPS function provides a connection matrix process not affecting the characteristic information of the signal applied at reference points XT and XL respectively (see informative annex D for implementation detail
48、s). The set of input and output ports is divided into two subsets, each containing both input and output ports X Line (XL) and X Tributary (XT) as shown in figures 5 and 6. This connection matrix allows interconnectivity as shown in table 1. XT (W i, Wj, O, Oj, Pi, Pj ) Figure 6: Connection matrix f
49、or RPS ETSI ETS*300*635 96 3400855 OL4LL54 39T Input output XL Wi XT pj XL Oj XT Page 18 ETS 300 635: October 1996 w i pi XL XT XL - i=j - El I= - *. - - El - - i=j The signals associated with the reference points XT and XL respectively are: Tributary side, reference point XT: - Wi, Wj i,j = ln working signals; - Oi, Oj I, = 1 . m . occasional signals. Line side, reference point XL: - Wi, Wj 1,J = 1 n working signals; where “i“ indicates an incoming signal and “j“ indicates an outgoing signal. Pi, Pj I,J = 1 m protection signals. RPS prov
