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PEB2256HT Datasheet(PDF) 151 Page - Infineon Technologies AG |
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PEB2256HT Datasheet(HTML) 151 Page - Infineon Technologies AG |
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151 / 490 page  FALC56 V1.2 PEB 2256 Functional Description T1/J1 Data Sheet 151 2002-08-27 5.3.2 Auto Modes • Automatic remote alarm (Yellow Alarm) access If the receiver has lost its synchronization (FRS0.LFA) a remote alarm (yellow alarm) is sent to the distant end automatically, if enabled by bit FMR2.AXRA. In synchronous state the remote alarm bit is removed. • Automatic AIS to system interface In asynchronous state the synchronizer enforces an AIS to the receive system interface automatically. However, received data is switched through transparently if bit FMR2.DAIS is set. Yellow Alarm or Remote Alarm (RRA) 1) RC1.RRAM = 0: bit 2 = 0 in 255 consecutive time slots or FS-bit = 1 of frame12 in F12 (D4) format or 8 ×1,8×0 in the DL channel (ESF) RC1.RRAM = 1: bit 2 = 0 in every time slot per frame or FS-bit = 1 of frame12 in F12 (D4) format or 8 ×1,8×0 in the DL channel (ESF) RC1.RRAM = 0: set conditions no longer detected. RC1.RRAM = 1: bit 2 = 0 not detected in 3 consecutive frames or FS-bit not detected in 3 consecutive multiframes or 8 ×1,8×0 not detected for 3 times in a row (ESF). Excessive Zeros (EXZD) more than 7 (B8ZS code) or more than 15 (AMI code) contiguous zeros Latched Status: cleared on read Pulse-Density Violation (PDEN) less than N ones in each and every time window of 8 ×(N+1) time slots with N taking all values of 1 to 23 or more than 15 consecutive zeros Latched Status: cleared on read Transmit Line Short (XLS) more than 3 pulse periods with highly increased transmit line current on XL1/2 transmit line current limiter inactive Transmit Ones- Density (XLO) 32 consecutive zeros in the transmit data stream on XL1/2 Cleared with each transmitted pulse 1) RRA detection operates in the presence of 10-3 bit error rate. Table 38 Summary of Alarm Detection and Release (T1/J1) (cont’d) Alarm Detection Condition Clear Condition |
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