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2                                                 Transport aspects


                                        Table 7-7 – ODTU payload bandwidth (kbit/s)
                                                                                          ODTU payload
                  ODTU type                ODTU payload nominal bandwidth
                                                                                         bit-rate tolerance
             ODTU01              (1904 + 1/8)/3824  ODU1 bit rate
             ODTU12              (952 + 1/16)/3824  ODU2 bit rate
             ODTU13              (238 + 1/64)/3824  ODU3 bit rate

             ODTU23              (952 + 4/64)/3824  ODU3 bit rate
                                                                                            20 ppm
             ODTU2.ts            ts  476/3824  ODU2 bit rate
             ODTU3.ts            ts  119/3824  ODU3 bit rate
             ODTU4.ts            ts  47.5/3824  ODU4 bit rate
             ODTUCn.ts           ts  190.4/3824  ODUCn bit rate/n

                                        Minimum                   Nominal                   Maximum

             ODTU01              1 244 216.796           1 244 241.681              1 244 266.566
             ODTU12              2 498 933.311           2 498 983.291              2 499 033.271
             ODTU13              2 509 522.012           2 509 572.203              2 509 622.395
             ODTU23              10 038 088.048          10 038 288.814             10 038 489.579
             ODTU2.ts            ts  1 249 384.632      ts  1 249 409.620         ts  1 249 434.608
             ODTU3.ts            ts  1 254 678.635      ts  1 254 703.729         ts  1 254 728.823

             ODTU4.ts            ts  1 301 683.217      ts  1 301 709.251         ts  1 301 735.285
             ODTUCn.ts           ts  5 240 781.554      ts  5 240 886.372         ts  5 240 991.189
             NOTE – The bandwidth is an approximated value, rounded to 3 decimal places.


                               Table 7-8 – Recommended ODUflex (GFP) bit rates and tolerance

                                  ODU type                           Nominal bit-rate          Tolerance

             ODU2.ts(Note 1)                                    1'249'177.230 kbit/s

             ODU3.ts(Note 1)                                    1'254'470.354 kbit/s

             ODU4.ts(Note 1)                                    1'301'467.133 kbit/s
             ODUflex(GFP) of n 1.25G tributary slots, 1  n  8   n  ODU2.ts                  100 ppm

             ODUflex(GFP) of n 1.25G tributary slots, 9  n  32   n  ODU3.ts                 100 ppm
             ODUflex(GFP) of n 1.25G tributary slots, 33  n  80 (Note   n  ODU4.ts          100 ppm
             2)
             NOTE 1 – The values of ODUk.ts are chosen to permit a variety of methods to be used to generate an ODUflex(GFP) clock. See
             Appendix XI for the derivation of these values and example ODUflex(GFP) clock generation methods.
             NOTE 2 – Transport of packet clients via an ODUflex(GFP) is specified up to 100 Gbit/s.


















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