NEC UPD98413 User Manual page 142

Table 4-5. OH Bytes That Cannot Be Changed from Insert Interface
TOH
POH
If the transmission of Line AIS, Line RDI, or Path RDI is specified by using a register or pin, alarm transmission
takes precedence, some bytes may be overwritten.
Table 4-6. OH Bytes That Cannot Be Changed When Alarm Is Transmitted
K2 (bits 6-8)
G1 (bit 5-7)
All bytes of
LOH and POH
142
CHAPTER 4 INTERFACES
A1 Synchronization pattern is always transmitted.
A2
B1 Section BIP-8 is transmitted.
B2 Line BIP-24 is always transmitted.
H1 Pointer is always transmitted.
H2
H3
M1 Line REI is always transmitted.
B3 Path BIP-8 is always transmitted.
G1 (bits 1-4) Path REI is always transmitted.
The µPD98413 processing needed to transmit an alarm takes precedence and
'110' is transmitted if the automatic return function of Line RDI is effected, if the
LRDI bit of the CMALM register is set, or if '011' code is input to the TALMA-C
pins.
If the automatic return function of (Enhance) Path RDI is effected, if the PRDI
[2:0] bits of the CMALM register is set, alarm transmission takes precedence,
and this bit is set to 1.
When the µPD98413 transmits alarm Line AIS, alarm transmission takes
precedence, and all the bits are set to 1 for transmission.
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