<Li> Group VI contains a block of four J - bits, a block of R - bits (justification opportunity), one per tributary, and 480 T - bits . To check whether R - bits have been used, the J - bits are analyzed in each of the groups II, III, IV, V, and VI (there are five per tributary). Ideally the R - bit does not carry useful information on 41.9% of the occasions . </Li> <Table> E4 488 Bits / Row <Tr> <Th> Group </Th> <Th_colspan="4"> Bits </Th> </Tr> <Tr> <Th> </Th> <Td> FAS 111110100000 (12 bits) </Td> <Td> </Td> <Td> 3 S Bits </Td> <Td> 472 Tributary Bits </Td> </Tr> <Tr> <Th> II </Th> <Td> J1 J2 J3 J4 </Td> <Td_colspan="3"> 484 Tributary Bits </Td> </Tr> <Tr> <Th> III </Th> <Td> J1 J2 J3 J4 </Td> <Td_colspan="3"> 484 Tributary Bits </Td> </Tr> <Tr> <Th> IV </Th> <Td> J1 J2 J3 J4 </Td> <Td_colspan="3"> 484 Tributary Bits </Td> </Tr> <Tr> <Th> V </Th> <Td> J1 J2 J3 J4 </Td> <Td_colspan="3"> 484 Tributary Bits </Td> </Tr> <Tr> <Th> VI </Th> <Td> J1 J2 J3 J4 </Td> <Td_colspan="2"> R1 R2 R3 R4 </Td> <Td> 480 Tributary Bits </Td> </Tr> </Table> <Tr> <Th> Group </Th> <Th_colspan="4"> Bits </Th> </Tr> <Tr> <Th> </Th> <Td> FAS 111110100000 (12 bits) </Td> <Td> </Td> <Td> 3 S Bits </Td> <Td> 472 Tributary Bits </Td> </Tr>

Frame structure in european hierarchy contains how many slots