Page 1329 - 5G Basics - Core Network Aspects

Transport aspects 2

9.1.1 100G interface alignment markers

The 100G FlexO interface consists of four logical lanes, numbered 0, 1, 2 and 3. Each lane carries a 120-bit
lane alignment marker (ami, i = 0,1,2,3) as specified in Table 9-1 plus 120 pad bits (padi, i=0,1,2,3) that have
a value of all-0s prior to scrambling. Rows of Table 9-1 give the values of ami transmitted over lane i.

The 960-bit 100G FlexO alignment marker area contains 10-bit interleaved parts of am0, am1, am2, am3,
pad0, pad1, pad2 and pad3 as illustrated in Figure 9-3. The first 480 bits contain the 10-bit interleaved parts
of am0 to am3 in the order am0, am1, am2, am3, am0, am1, etc. The second 480 bits contain the 10-bit
interleaved parts of pad0 to pad3 in the order pad0, pad1, pad2, pad3, pad0, pad1, etc.

Figure 9-3  100G FlexO alignment marker area with four interleaved lane alignment markers and
padding

Table 9-1  100G FlexO lane alignment marker values

lane Encoding

{CM0, CM1, CM2, UP0, CM3, CM4, CM5, UP1, UM0, UM1, UM2, UP2, UM3, UM4, UM5}
0 59 52 64 6D A6 AD 9B 9B 80 8E CF 64 7F 71 30
1 59 52 64 20 A6 AD 9B E6 5A 7B 7E 19 A5 84 81
2 59 52 64 62 A6 AD 9B 7F 7C CF 6A 80 83 30 95
3 59 52 64 5A A6 AD 9B 21 61 01 0B DE 9E FE F4
NOTE – The value in each byte of this table is in MSB-first transmission order. Note that this per-byte bit ordering is the reverse
of AM values found in [b-IEEE 802.bs], which uses an LSB-first bit transmission format.

9.2 Overhead description
The FlexO OH area is contained in the 320 bits following the FlexO frame AM area. The OH structure
amounts to 2,560 bits (320 bytes) and is distributed across an 8-frame multi-frame, as shown in Figure 9-4.
Each frame contains 40 OH bytes.

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