Page 1327 - 5G Basics - Core Network Aspects

Transport aspects 2

Figure 8-2  FlexO multi-frame structure

8.3 Bit rates

The FlexO frame payload consists of 5,244,160 bits (655,520 bytes) out of the total 5,570,560 bits (696,320
bytes) per FlexO multi-frame.

FlexO_rate = 256/241 × OTUC_rate
= 256/241 × 239/226 × 99,532,800 kbit/s ±20 ppm
NOTE – The resulting 100G FlexO bit rate is within a -4.46 ppm offset of the OTU4 nominal bit rate.

8.4 FEC
FlexO FEC codewords occupy a row in the FlexO frame. The FlexO frame allocates 300 bits for FEC parity,
per row as shown in Figure 8-1. The FEC scheme employs Reed-Solomon code operating over the Galois
10
Field GF(2 ), where the symbol size is 10 bits.
Reed-Solomon code is denoted as RS(n,k) where k represents the number of message symbols to generate
2t parity symbols, which are appended to the message. The resulting formula is n=k+2t
n=544
k=514
t=15

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