Page 1112 - 5G Basics - Core Network Aspects

2 Transport aspects

Table 7-2  ODU types and bit rates

ODU type ODU nominal bit rate ODU bit-rate tolerance

ODU0 1 244 160 kbit/s
ODU1 239/238 × 2 488 320 kbit/s
ODU2 239/237 × 9 953 280 kbit/s
20 ppm
ODU3 239/236 × 39 813 120 kbit/s
ODU4 239/227 × 99 532 800 kbit/s
ODUCn n × 239/226 × 99 532 800 kbit/s
ODU2e 239/237 × 10 312 500 kbit/s 100 ppm
ODUflex for CBR 239/238 × client signal bit rate
100 ppm (Notes 2, 3)
client signals
ODUflex for GFP-F mapped Configured bit rate (see Table 7-8) 100 ppm
client signals
ODUflex for IMP mapped client s × 239/238 × 5 156 250 kbit/s 100 ppm
signals s = 2, 8, n × 5 with n ≥ 1 (Note 4)
ODUflex for FlexE-aware client 103 125 000 × 240/238 × n/20 kbit/s ± 100 ppm
signals (n = n1 + n2 + .. + np)

NOTE 1 – The nominal ODU rates are approximately: 2 498 775.126 kbit/s (ODU1), 10 037 273.924 kbit/s (ODU2), 40 319 218.983
kbit/s (ODU3), 104 794 445.815 kbit/s (ODU4), 10 399 525.316 kbit/s (ODU2e), n × 105 258 138.053 kbit/s (ODUCn).
NOTE 2 – The bit-rate tolerance for ODUflex(CBR) signals is specified as 100 ppm. This value may be larger than the tolerance
for the client signal itself (e.g., 20 ppm). For such case, the tolerance is determined by the ODUflex(CBR) maintenance signals,
which have a tolerance of 100 ppm.
NOTE 3 – For ODUflex(CBR) signals with nominal bit rates close to the maximum ODTUk.ts payload bit rate and client rate
tolerances less than 100 ppm (e.g., 10 ppm), the ODUflex(CBR) maintenance signal bit rates may exceed the ODTUk.ts payload
bit rate. For such cases either an additional tributary slot may be used (i.e., ODTUk.(ts+1)), or the nominal bit rate of the
ODUflex(CBR) signal may be artificially reduced to a value of 100 ppm below the maximum ODUflex(CBR) signal bit rate.
NOTE 4 – Refer to clause 12.2.6 for considerations on the values of "s".

Table 7-3  OPU types and bit rates

OPU type OPU payload nominal bit rate OPU payload bit-rate tolerance

OPU0 238/239 × 1 244 160 kbit/s
OPU1 2 488 320 kbit/s
OPU2 238/237 × 9 953 280 kbit/s
20 ppm
OPU3 238/236 × 39 813 120 kbit/s
OPU4 238/227 × 99 532 800 kbit/s
OPUCn n × 238/226 × 99 532 800 kbit/s
OPU2e 238/237 × 10 312 500 kbit/s 100 ppm
OPUflex for CBR client signal bit rate client signal bit-rate tolerance,
client signals with a maximum of 100 ppm
OPUflex for GFP-F mapped 238/239 × ODUflex signal rate 100 ppm
client signals
OPUflex for IMP mapped client s × 5 156 250 kbit/s 100 ppm
signals s = 2, 8, n × 5 with n ≥ 1 (Note 2)

OPUflex for FlexE-aware client 103 125 000 × 240/239 × n/20 kbit/s ± 100 ppm
signals (n = n1 + n2 + .. + np)

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