XRT79L71IB View Datasheet(PDF) - Exar Corporation
Part Name
Description
MFG CO.
'XRT79L71IB' PDF : 441 Pages View PDF
PRELIMINARY
XRT79L71
REV. P2.0.0
1-CHANNEL DS3/E3 CLEAR-CHANNEL FRAMERLIU COMBO - CC/HDLC ARCHITECTURE
FIGURE 229. ILLUSTRATION OF THE FUNCTIONAL BLOCK DIAGRAM OF THE TRANSMIT DIRECTION CIRCUITRY, WHENEVER THE XRT79L71
HAS BEEN CONFIGURED TO OPERATE IN THE E3, ITU-T G.832 CLEAR-CHANNEL FRAMER MODE (WITH THE TRANSMIT TRAIL-
TRACE MESSAGE CONTROLLER BLOCK HIGHLIGHTED).................................................................................................... 489
6.2.4.1 AN INTRODUCTION TO TRAIL-TRACE MESSAGES ................................................................................... 489
TABLE 64: THE BYTE-FORMAT OF THE TRAIL-TRACE MESSAGE THAT THIS BEING TRANSPORTED VIA AN E3 DATA-STREAM VIA THE TR BYTE
490
6.2.4.2 CONFIGURING THE XRT79L71 TO TRANSMIT TRAIL-TRACE MESSAGES .............................................. 490
6.2.5 TRANSMIT SSM CONTROLLER BLOCK................................................................................................................ 494
FIGURE 230. ILLUSTRATION OF THE FUNCTIONAL BLOCK DIAGRAM OF THE TRANSMIT DIRECTION CIRCUITRY, WHENEVER THE XRT79L71
HAS BEEN CONFIGURED TO OPERATE IN THE E3, ITU-T G.832 CLEAR-CHANNEL FRAMER MODE (WITH THE TRANSMIT SSM CON-
TROLLER BLOCK HIGHLIGHTED)...................................................................................................................................... 495
6.2.5.1 AN INTRODUCTION TO SSM (SYNCHRONIZATION STATUS MESSAGES) .............................................. 495
FIGURE 231. THE BIT-FORMAT OF THE MA-BYTE WITHIN THE E3, ITU-T G.832 FRAMING FORMAT................................................ 495
TABLE 65: THE RELATIONSHIP BETWEEN THE STATES OF BITS 6 AND 7 (WITHIN THE MA BYTE) AND THE EXACT SSM BIT THAT IS BEING
TRANSPORTED VIA BIT 8, WITHIN THE CURRENT MA BYTE.............................................................................................. 496
6.2.5.2 CONFIGURING THE XRT79L71 TO TRANSMIT SYNCHRONIZATION STATUS MESSAGES ................... 496
6.2.6 TRANSMIT E3 FRAMER BLOCK............................................................................................................................. 497
FIGURE 232. ILLUSTRATION OF THE FUNCTIONAL BLOCK DIAGRAM OF THE TRANSMIT DIRECTION CIRCUITRY, WHENEVER THE XRT79L71
HAS BEEN CONFIGURED TO OPERATE IN THE E3, ITU-T G.832 CLEAR-CHANNEL FRAMER MODE (WITH THE TRANSMIT DS3/E3
FRAMER BLOCK HIGHLIGHTED) ...................................................................................................................................... 498
6.2.6.1 TRANSMITTING THE LOS PATTERN ............................................................................................................ 498
6.2.6.2 TRANSMITTING THE E3 AIS PATTERN ........................................................................................................ 499
6.2.6.3 TRANSMITTING THE FERF/RDI INDICATOR ................................................................................................ 499
FIGURE 233. ILLUSTRATION OF THE NEAR-END RECEIVE DS3/E3 FRAMER BLOCK DECLARING THE LOS DEFECT CONDITION ........ 502
FIGURE 234. ILLUSTRATION OF THE NEAR-END TRANSMIT DS3/E3 FRAMER BLOCK, TRANSMITTING AN E3 FRAME TO THE REMOTE TERMINAL
WITH THE FERF/RDI BIT SET TO "1" ............................................................................................................................. 503
FIGURE 235. ILLUSTRATION OF THE NEAR-END RECEIVE DS3/E3 FRAMER BLOCK RECEIVING A PROPER E3 SIGNAL FROM THE REMOTE
TERMINAL EQUIPMENT (E.G., THE LOS DEFECT CONDITION IS CLEARED) ....................................................................... 504
FIGURE 236. ILLUSTRATION OF THE NEAR-END TRANSMIT DS3/E3 FRAMER BLOCK TRANSMITTING AN E3 FRAME TO THE REMOTE TERMINAL
EQUIPMENT WITH THE FERF/RDI BIT-FIELD SET TO "0".................................................................................................. 505
6.2.6.4 TRANSMITTING THE FEBE/REI (FAR-END BLOCK ERROR/REMOTE ERROR) INDICATOR .................. 505
FIGURE 237. A SIMPLE ILLUSTRATION OF A NEAR-END TERMINAL EXCHANGING E3 DATA WITH A REMOTE TERMINAL, IN AN UN-ERRED MAN-
NER.............................................................................................................................................................................. 506
FIGURE 238. A SIMPLE ILLUSTRATION OF THE NEAR-END TERMINAL TRANSMITTING THE UN-ERRED INDICATION TO THE REMOTE TERMINAL
EQUIPMENT .................................................................................................................................................................. 506
FIGURE 239. A SIMPLE ILLUSTRATION OF A NEAR-END TERMINAL DETECTING EM BYTE ERRORS WITHIN ITS INCOMING E3 SIGNAL.. 507
FIGURE 240. A SIMPLE ILLUSTRATION OF THE NEAR-END TERMINAL EQUIPMENT TRANSMITTING THE FEBE/REI INDICATOR TO THE REMOTE
TERMINAL EQUIPMENT ................................................................................................................................................... 507
6.2.6.5 Setting the Payload-Type Bit-fields within the outbound E3 Data-stream ................................................ 509
6.2.6.6 User Control over the GC Byte within the outbound E3 data-stream ........................................................ 509
6.2.6.7 User Control over the NR Byte within the outbound E3 data-stream ........................................................ 509
6.2.6.8 SETTING THE TRANSMIT E3 FRAMER BLOCK TIMING REFERENCE ........................................................................ 509
6.2.7 TRANSMIT DS3/E3 LIU INTERFACE BLOCK - E3 APPLICATIONS ..................................................................... 511
FIGURE 241. ILLUSTRATION OF THE FUNCTIONAL BLOCK DIAGRAM OF THE TRANSMIT DIRECTION CIRCUITRY, WHENEVER THE XRT79L71
HAS BEEN CONFIGURED TO OPERATE IN THE E3, ITU-T G.832 CLEAR-CHANNEL FRAMER MODE (WITH THE TRANSMIT DS3/E3
LIU BLOCK HIGHLIGHTED) ............................................................................................................................................. 512
6.3 THE RECEIVE DIRECTION - E3, ITU-T G.832 CLEAR-CHANNEL FRAMER APPLICATIONS ................ 512
FIGURE 242. ILLUSTRATION OF THE FUNCTIONAL BLOCK DIAGRAM OF THE RECEIVE DIRECTION CIRCUITRY WHENEVER THE XRT79L71 HAS
BEEN CONFIGURED TO OPERATE IN THE E3 CLEAR-CHANNEL FRAMER MODE ................................................................. 513
6.3.1 THE RECEIVE E3 LIU BLOCK ................................................................................................................................. 513
FIGURE 243. ILLUSTRATION OF THE FUNCTIONAL BLOCK DIAGRAM OF THE RECEIVE DIRECTION CIRCUITRY, WHENEVER THE XRT79L71 HAS
BEEN CONFIGURED TO OPERATE IN THE E3, ITU-T G.832 CLEAR-CHANNEL FRAMER MODE (WITH THE "RECEIVE DS3/E3 LIU"
BLOCK HIGHLIGHTED) .................................................................................................................................................... 514
6.3.2 THE RECEIVE E3 FRAMER BLOCK ....................................................................................................................... 514
FIGURE 244. ILLUSTRATION OF THE FUNCTIONAL BLOCK DIAGRAM OF THE RECEIVE DIRECTION CIRCUITRY, WHENEVER THE XRT79L71 HAS
BEEN CONFIGURED TO OPERATE IN THE E3, ITU-T G.832 CLEAR-CHANNEL FRAMER MODE (WITH THE RECEIVE DS3/E3 FRAMER
BLOCK HIGHLIGHTED) .................................................................................................................................................... 515
6.3.2.1 THE FRAME-ACQUISITION MODES .............................................................................................................. 515
FIGURE 245. THE RECEIVE E3 FRAMER BLOCK'S FRAME ACQUISITION/MAINTENANCE ALGORITHM - E3, ITU-T G.832 APPLICATIONS516
FIGURE 246. THE STATE MACHINE DIAGRAM FOR THE RECEIVE E3 FRAMER BLOCK'S FRAME ACQUISITION/MAINTENANCE ALGORITHM (WITH
THE FA1 AND FA2 OCTET SEARCH STATE SHADED)...................................................................................................... 517
FIGURE 247. THE STATE MACHINE DIAGRAM FOR THE RECEIVE E3 FRAMER BLOCK'S FRAME ACQUISITION/MAINTENANCE ALGORITHM (WITH
THE FA1 AND FA2 OCTET VERIFICATION STATE SHADED).............................................................................................. 518
FIGURE 248. THE STATE MACHINE DIAGRAM FOR THE RECEIVE E3 FRAMER BLOCK'S FRAME ACQUISITION/MAINTENANCE ALGORITHM (WITH
THE OOF STATE SHADED) ............................................................................................................................................ 519
6.3.2.2 THE FRAME-MAINTENANCE MODE - THE OOF AND LOF DEFECT DECLARATION CRITERIA ............. 522
XIV
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