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These bytes are located in row 2, columns 4 and 14 and row 3, columns 13 and 14 of the ODU overhead. The ODUk contains one instance of ODU EXP overhead. (...) There is no requirement to forward the EXP overhead beyond the (sub)network; i.e., the operational span of the EXP overhead is limited to the (sub)network with the vendor's equipment, or the network of the operator. 15.8.2.7 ODU reserved overhead (RES) For the case of an ODUk, eight bytes and one bit are reserved in the ODU overhead for future international standardization. (...) The OPU PSI and PT overhead locations are shown in Figure 15-26. The OPUk contains one instance of OPU overhead.
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Score: 1277334.9 - https://www.itu.int/en/publica...files/basic-html/page1160.html
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The OTUk/ODUk contains one instance of OTU/ODU frame alignment overhead. The OTUCn/ODUCn contains n instances of OTU/ODU frame alignment overhead, numbered 1 to n. Figure 15-9  OTU/ODU frame alignment overhead 15.6.2 OTU/ODU frame alignment overhead definition 15.6.2.1 Frame alignment signal (FAS) A six byte OTU-FAS signal (see Figure 15-10) is defined in row 1, columns 1 to 6 of the OTU overhead. (...) The OTUk contains one instance of OTU multi-frame alignment overhead. The OTUCn contains n instances of OTU multi-frame alignment overhead, numbered 1 to n.
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Score: 1274135.8 - https://www.itu.int/en/publica...files/basic-html/page1140.html
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An ODU1 signal is extended with a frame alignment overhead and asynchronously mapped into the optical data tributary unit 1 into 2 (ODTU12) using the AMP justification overhead (JOH). An ODU0 signal is extended with a frame alignment overhead and asynchronously mapped into the optical data tributary unit 2.1 (ODTU2.1) using the GMP justification overhead. An ODUflex signal is extended with a frame alignment overhead and asynchronously mapped into the optical data tributary unit 2.ts (ODTU2.ts) using the GMP justification overhead.
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Score: 1261817.2 - https://www.itu.int/en/publica...files/basic-html/page1118.html
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., x 1 2 47/ 48/ 95 1 2 47/ 48/ 95 1 2 47/ 48/ 95 JC6 JC3 48 49 48 49 48 49 G.709-Y.1331(12)_F19-13 Figure 19-13 – Mapping of ODTU4.ts into 'ts' OPU4 1.25G tributary slots 19.4 OPUk multiplex overhead and ODTU justification overhead The OPUk (k=1,2,3,4) multiplex overhead consists of a multiplex structure identifier (MSI) and an ODTU overhead. (...) The OPUk MSI overhead locations are shown in Figures 19-14A, 19-14B and 19-14C and the OMFI overhead location is shown in Figure 19-14C. ODTUjk overhead The ODTUjk overhead carries the AMP justification overhead consisting of justification control (JC) and negative justification opportunity (NJO) signals in column 16 of rows 1 to 4.
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Score: 1253852.6 - https://www.itu.int/en/publica...files/basic-html/page1212.html
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An ODU0 signal is extended with a frame alignment overhead and asynchronously mapped into the optical data tributary unit 4.1 (ODTU4.1) using the GMP justification overhead (JOH). An ODU1 signal is extended with a frame alignment overhead and asynchronously mapped into the optical data tributary unit 4.2 (ODTU4.2) using the GMP justification overhead. (...) An ODU2e signal is extended with a frame alignment overhead and asynchronously mapped into the optical data tributary unit 4.8 (ODTU4.8) using the GMP justification overhead.
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Score: 1253753.5 - https://www.itu.int/en/publica...files/basic-html/page1119.html
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The information content is not standardized. 3.12 overhead information : Six types of overhead information are defined: 1) Trail Termination Overhead Information: See ITU-T Rec. G.870/Y.1352. 2) Client-Specific Overhead Information: See ITU-T Rec. G.870/Y.1352. 3) Auxiliary Channel Overhead Information: See ITU-T Rec. G.870/Y.1352. 4) Reserved Overhead Information. 5) Unassigned Overhead Information: See ITU-T Rec.
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Score: 1250695.1 - https://www.itu.int/itudoc/itu-t/com15/implgd/g872ig_ww9.doc
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The ODU1 signals including the frame alignment overhead and an all-0s pattern in the OTUk overhead locations are adapted to the ODU2 clock via justification (asynchronous mapping). (...) OTU2 [or OTU2V] overhead and frame alignment overhead are added to complete the signal for transport via an OTM signal. (...) The ODU0 signals including the frame alignment overhead and an all-0s pattern in the OTUk overhead locations are adapted to the ODU1 clock via justification (asynchronous mapping).
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Score: 1247376.5 - https://www.itu.int/en/publica...files/basic-html/page1294.html
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The remaining OPUCn TSOH bytes are reserved for future international standardization. 119 1 2 3 ts  ts 1 2 3 ODTUCn.ts JC4 JC1 4 5 JC5 JC2 6 JC6 JC3 7 8 OMFI OPUCn TS #A1.B1 OPUCn TS #A2.B2 OPUcn TS #A ts Bts bits 45678 TS #A1.B1 1 1 1 00000 RES RES TS #A.2.B2 2 2 2 RES RES RES RES RES RES RES RES TS #Ats.Bts4 3 4 3 4 3 4 OPUCn tributary slots RES RES JC4 JC5 JC1 JC2 5 6 5 6 ........... 5 6 10011 OPUCn TSOH JC6 JC3 7 8 7 8 7 8 of TS #A1.B1, A2.B2, ..., Ats.Bts 1 2 119 1 2 119 1 2 119 G.709-Y.1331(16)_F20-6 Figure 20-6 – Mapping of ODTUCn.ts into 'ts' OPUCn 5G tributary slots 20.4 OPUCn multiplex overhead and ODTU justification overhead The OPUCn multiplex overhead consists of a multiplex structure identifier (MSI), an OPU multiframe identifier (OMFI), an ODTU overhead and bytes reserved for future international standardization. The OPUCn MSI, OMFI and RES overhead locations are shown in Figure 20-7. ODTUCn.ts overhead The ODTUCn.ts overhead carries the GMP justification overhead consisting of 18 bits of justification control (JC1[3-8], JC2[3-8], JC3[3-8]) which carry the 10-bit GMP Cm information and ODUk (k=0,1,2,2e,3,4,flex) specific 30 bits of justification control (JC1[1-2], JC2[1-2], JC3[1-2], JC4, JC5, JC6) which carry the 18-bit GMP C8D information. The JC1, JC2, JC3, JC4, JC5 and JC6 overhead locations are shown in Figure 20-7. 1230     1235     1236     1237     1238     1239     1240     1241     1242     1243     1244     1245          
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Score: 1245675.1 - https://www.itu.int/en/publica...files/basic-html/page1240.html
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Examples of OTUkV frame structures are: – OTUkV with the same overhead byte allocation as the OTUk, but use of an alternative FEC as shown in Figure II.2; – OTUkV with the same overhead byte allocation as the OTUk, but use of a smaller, alternative FEC code and the remainder of the OTUkV FEC overhead area filled with fixed stuff as shown in Figure II.3; – OTUkV with a larger FEC overhead byte allocation as the OTUk, and use of an alternative FEC as shown in Figure II.4; – OTUkV with no overhead byte allocation for FEC as shown in Figure II.5; – OTUkV with a different frame structure than the OTUk frame structure, supporting a different OTU overhead (OTUkV overhead and OTUkV FEC) as shown in Figure II.6; – OTUkV with a different frame structure than the OTUk frame structure, supporting a different OTU overhead (OTUkV overhead) and with no overhead byte allocation for FEC as shown in Figure II.7.
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Score: 1245675.1 - https://www.itu.int/en/publica...files/basic-html/page1291.html
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 Page 1098 - 5G Basics - Core Network Aspects           Basic HTML Version Table of Contents View Full Version Page 1098 - 5G Basics - Core Network Aspects P. 1098 2 Transport aspects – ODU path CMEP (P_CMEP), which represents the end-points of the ODUkP/ODUCnP trail. The PM overhead field contains the related CMOH. 3.2.7 non-associated overhead: Supervisory information transported in an optical supervisory signal, overhead communication channel or other means. 3.2.8 optical data unit (ODU): The ODU is an information structure consisting of the information payload (OPU) and ODU related overhead, either as ODUk or ODUCn. 3.2.9 optical payload unit (OPU): The OPU is the information structure used to adapt client information for transport over the OTN, either as an OPUk or an OPUCn. It comprises client information together with any overhead needed to perform rate adaptation between the client signal rate and the OPU payload rate, and other OPU overheads supporting the client signal transport. (...) When the optical layer trail does not support a complete set of overhead (i.e., in case of OCh, OPS), the OTU overhead is used as overhead for such optical layer trail, and the OTU must terminate where the optical layer trail is terminated.
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Score: 1245206.8 - https://www.itu.int/en/publica...files/basic-html/page1098.html
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