CHAPTER 3 FUNCTIONAL OUTLINE
PRELIMINARY
NEC confidential and Proprietary
76
3.4 OAM
Function
The
µ
PD98413 has an OAM (Operation, Administration, Maintenance) function to maintain and monitor the
network. This section explains the OAM functions supported by the
µ
PD98413.
3.4.1 Transmitting
Alarm
Alarm information is set in a specific overhead area of a transmit frame and sent. The alarm information can be
transmitted by using a register, by inputting a signal to the alarm transmission command pin, or automatically
depending on the line status at the reception side.
Table 3-12. Transmitting an Alarm
Alarm
Transmitting/Terminating Method
Transmit Frame
(1)
APS
<1>
Set the K12T register.
<2>
Set the K1 and K2 bytes from the OH insert
interface.
The contents of the K12T register are loaded to
the positions of the K1 and K2 bytes and
transmitted each time a frame is sent.
(2)
Line AIS
<1>
Set the LAIS bits of the CMALM register.
<2>
Input a signal to the TALM pins.
All the bits other than those in the SOH area (LOH
+ POH + SPE areas) are set to "1".
(3)
Path AIS
<1>
Set the PAIS bits of the CMALM register.
<2>
Input a signal to the TALM pins.
All the H1, H2, and H3 bytes and all the bits in the
SPE area before frame scramble are set to "1".
(4)
Line RDI
<1>
Sets the LRDI bits of the CMALM register.
<2>
Input a signal to the TALM pins.
<3>
Automatic transmission due to occurrence of
an internal cause.
Bits 6 to 8 of the K2 byte of the OH byte are
"110".
(5)
Path RDI
<1>
Sets the PRDI bits of the CMALM register.
<2>
Input a signal to the TALM pins.
<3>
Automatic transmission due to occurrence of
an internal cause.
One-bit RDI: Bit 5 of the G1 byte of the OH byte is
"1".
Enhanced RDI: Bit 5-7 of the G1 byte of the OH
byte is the corresponding alarm.
If an attempt is made to transmit two or more alarms at the same time, or if an attempt is made to transmit another
alarm while Line RDI or Path RDI is automatically returned and transmitted, the priority is as follows:
Table 3-13. Priority of Alarm Transmission
Line AIS
Path AIS
Line RDI
Path RDI
APS
Line AIS
Line AIS
Line AIS
Line AIS
Line AIS
Path AIS
Line AIS
Can be set
simultaneously.
Path AIS
Can be set
simultaneously
.
Line RDI
Line AIS
Can be set
simultaneously.
Can be set
simultaneously.
Line RDI
Path RDI
Line AIS
Path AIS
Can be set
simultaneously.
Can
be
set
simultaneously
.
APS
Line AIS
Can be set
simultaneously.
Line RDI
Can be set
simultaneously.
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