NEC UPD98413 User Manual page 79

Enhanced Path RDI
• • • • Transmitting/clearing method
The Enhanced Path RDI frame can be transmitted in the following three ways. The frame is transmitted or
cleared by observing the boundary of the frame.
<1> Automatic return transmission
The corresponding Enhanced Path RDI frame is automatically transmitted if the following events are
detected at the reception side.
G1 bit5-7 Priority
001 4
010 3
101 1
110 2
When the µ PD98413 has recovered from the event, it resumes transmission of the ordinary frame (Bit5-
7 of G1 byte are "001"), but µ PD98413 guarantees to generate the Enhanced Path RDI frame for at least
20 frames. When a higher priority incoming defect is detected before the Enhanced Path RDI code for a
lower priority has been sent for 20 frames, µ PD98413 changes the Enhanced Path RDI code to a higher
priority code from a lower priority code, and not guarantee a lower priority code for 20 frames. This
function is enabled in the default mode, but can be disabled by using the APRDIM bit of the MDPOHT
register.
• • • • LCD is not included in the condition of automatic transmission of ERDI-P Payload defect in the default
mode, but can be included in the condition by using the LCDO bit of the MDPOHT register. LCD also is
invalid in the POS mode.
• • • • Path TIM is not included in the condition of automatic transmission of ERDI-P Connectivity defect in the
default mode, but can be included in the condition by using the PTIMO bit of the MDPOHT register.
• • • • Path TIU is not included in the condition of automatic transmission of ERDI-P Connectivity defect in the
default mode, but can be included in the condition by using the PTIUO bit of the MDPOHT register.
<2> Set the PRDIC field of the CMALM register to the following value. While this field is set to the following
value, the following Enhanced Path RDI frame is transmitted.
PRDI field
000, 100, 101, 110, 111
100
101
110
<3> Drive the TALM pins to the following code. While these pins are set to the following code, the following
Enhanced Path RDI frame is transmitted.
TALMCx-TALMAx pins
000
100
101
110
• • • • Enhanced Path RDI frame
This frame has the above value in bit 5-7 of the G1 byte of the OH byte.
CHAPTER 3 FUNCTIONAL OUTLINE
Trigger
No defects
Path PLM, (LCD option)
LOS, LOF, Line AIS, Path AIS, LOP
Path UNEQ, (Path TIM, Path TIU option)
G1 bit5-7 Interpretation
001 No RDI-P defect
010 ERDI-P Payload defect
101 ERDI-P Server defect
110 ERDI-P Connectivity defect
G1 bit5-7 Interpretation
001 No RDI-P defect
101 ERDI-P Server defect
110 ERDI-P Connectivity defect
010 ERDI-P Payload defect
PRELIMINARY
Interpretation
No RDI-P defect
ERDI-P Payload defect
ERDI-P Server defect
ERDI-P Connectivity defect
NEC confidential and Proprietary
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