PEB2256HT datasheet(90/490 Pages) INFINEON

90 / 490 page

FALC56 V1.2

PEB 2256

Functional Description E1

Data Sheet

2002-08-27

4.3

Additional Receive Framer Functions (E1)

4.3.1

Error Performance Monitoring and Alarm Handling

Alarm Indication Signal: Detection and recovery is flagged by bit FRS0.AIS and

ISR2.AIS. Transmission is enabled by bit FMR1.XAIS.

Loss-Of-Signal: Detection and recovery is flagged by bit FRS0.LOS and ISR2.LOS.

Remote Alarm Indication: Detection and release is flagged by bit FRS0.RRA, RSW.RRA

and ISR2.RA/RAR. Transmission is enabled by bit XSW.XRA.

AIS in time slot 16: Detection and release is flagged by bit FRS1.TS16AIS and

ISR3.AIS16. Transmission is enabled by writing all ones in registers XS(16:1).

LOS in time slot 16: Detection and release is flagged by bit FRS1.TS16LOS.

Transmission is enabled by writing all zeros in registers XS(16:1).

Remote Alarm in time slot 16: Detection and release is flagged by bit FRS1.TS16RA and

ISR3.RA16. Transmission is enabled by bit XS1.2.

Transmit Line Shorted: Detection and release is flagged by bit FRS1.XLS and

ISR1.XLSC.

Transmit Ones-Density: Detection and release is flagged by bit FRS1.XLO and

ISR1.XLSC.

Table 20

Summary of Alarm Detection and Release (E1)

Alarm

Detection Condition

Clear Condition

Loss-Of-Signal

(LOS)

no transitions (logical

zeros) in a programmable

time interval of 16 to 4096

consecutive pulse periods.

Programmable receive

input signal threshold

programmable number of ones (1

to 256) in a programmable time

interval of 16 to 4096 consecutive

pulse periods. A one is a signal

with a level above the

programmed threshold.

Alarm Indication

Signal (AIS)

FMR0.ALM = 0:

less than 3 zeros in

250 µs and loss of frame

alignment declared

FMR0.ALM = 1:

less than 3 zeros in

each of two consecutive

250-µs periods

FMR0.ALM = 0:

more than 2 zeros in

250 µs

FMR0.ALM = 1:

more than 2 zeros in each of two

500-µs periods

Remote Alarm

(RRA)

bit 3 = 1 in time slot 0 not

containing the FAS word

set conditions no longer detected.

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