PEB22554 SIEMENS [Siemens Semiconductor Group], PEB22554 Datasheet - Page 267

• Manufacturer Part Number: PEB22554
• Description: ICs for Communications
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

PEB 22554
Functional Description T1 / J1
Alarm Simulation
Alarm simulation does not affect the normal operation of the device, i.e. all time-slots
remain available for transmission. However, possible ‘real’ alarm conditions are not
reported to the processor or to the remote end when the device is in the alarm simulation
mode.
The alarm simulation is initiated by setting the bit FMR0.SIM. The following alarms are
simulated:
• Loss of Signal (red alarm)
• Alarm Indication Signal AIS (blue alarm)
• Loss of pulse frame
• Remote alarm (yellow alarm) indication
• Receive and transmit slip indication
• Framing error counter
• Code violation counter
• CRC6 error counter
Some of the above indications are only simulated if the QuadFALC is configured in a
mode where the alarm is applicable.
The alarm simulation is controlled by the value of the Alarm Simulation Counter:
FRS2.ESC which is incremented by setting bit: FMR0.SIM.
Clearing of alarm indications:
– Automatically for LOS, remote (yellow) alarm, AIS, and loss of synchronization and
– User controlled for slips by reading the corresponding interrupt status register ISR3.
– Error counter have to be cleared by reading the corresponding counter registers.
is only possible at defined counter steps of FRS2.ESC. For complete simulation
(FRS2.ESC = 0), eight simulation steps are necessary.
Semiconductor Group
267
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