Oam Function; Transmitting Alarm - NEC UPD98413 User Manual

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.
Alarm
<1> Set the K12T register.
(1) APS
<2> Set the K1 and K2 bytes from the OH insert
interface.
(2) Line AIS <1> Set the LAIS bits of the CMALM register.
<2> Input a signal to the TALM pins.
(3) Path AIS <1> Set the PAIS bits of the CMALM register.
<2> Input a signal to the TALM pins.
<1> Sets the LRDI bits of the CMALM register.
(4) Line RDI
<2> Input a signal to the TALM pins.
<3> Automatic transmission due to occurrence of
an internal cause.
<1> Sets the PRDI bits of the CMALM register.
(5) Path RDI
<2> Input a signal to the TALM pins.
<3> Automatic transmission due to occurrence of
an internal cause.
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:
Line AIS
Path AIS
Line RDI
Path RDI
APS
76
CHAPTER 3 FUNCTIONAL OUTLINE
Table 3-12. Transmitting an Alarm
Transmitting/Terminating Method
Table 3-13. Priority of Alarm Transmission
Line AIS Path AIS
Line AIS
Line AIS
Line AIS Can be set
simultaneously.
Line AIS Path AIS
Line AIS Can be set
simultaneously.
PRELIMINARY
Transmit Frame
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.
All the bits other than those in the SOH area (LOH
+ POH + SPE areas) are set to "1".
All the H1, H2, and H3 bytes and all the bits in the
SPE area before frame scramble are set to "1".
Bits 6 to 8 of the K2 byte of the OH byte are
"110".
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.
Line RDI Path RDI
Line AIS Line AIS
Can be set Path AIS
simultaneously.
Can be set
simultaneously.
Can be set
simultaneously.
Line RDI Can be set
simultaneously.
NEC confidential and Proprietary
APS
Line AIS
Can be set
simultaneously
.
Line RDI
Can be set
simultaneously
.