XRT73LC00A

II

REV. 1.0.1

E3/DS3/STS-1 LINE INTERFACE UNIT

3.1 INTERFACING THE RECEIVE SECTION OF THE XRT73LC00A TO THE LINE ......................................... 31

PLING

)............................................................................................................................................................................ 32

3.2 THE RECEIVE EQUALIZER BLOCK ............................................................................................................. 32

3.2.1 GUIDELINES FOR SETTING THE RECEIVE EQUALIZER ....................................................................................... 32

3.3 PEAK DETECTOR AND SLICER ................................................................................................................... 34

3.4 CLOCK RECOVERY PLL ............................................................................................................................... 34

3.5 THE HDB3/B3ZS DECODER ......................................................................................................................... 35

3.5.1 B3ZS DECODING DS3/STS-1 APPLICATIONS ........................................................................................................ 35

3.5.2 HDB3 DECODING E3 APPLICATIONS...................................................................................................................... 35

3.5.3 ENABLING/DISABLING THE HDB3/B3ZS DECODER ............................................................................................. 36

3.6 LOS DECLARATION/CLEARANCE .............................................................................................................. 36

3.6.1 THE LOS DECLARATION/CLEARANCE CRITERIA FOR E3 APPLICATIONS....................................................... 37

38

3.6.2 THE LOS DECLARATION/CLEARANCE CRITERIA FOR DS3 AND STS-1 APPLICATIONS ................................ 38

3.6.3 MUTING THE RECOVERED DATA WHILE THE LOS IS BEING DECLARED ......................................................... 40

3.7 ROUTING THE RECOVERED TIMING AND DATA INFORMATION TO THE RECEIVING TERMINAL EQUIP-

MENT .............................................................................................................................................................. 40

3.7.1 ROUTING SINGLE-RAIL FORMAT DATA (BINARY DATA STREAM) TO THE RECEIVE TERMINAL EQUIPMENT 42

TO THE

4.0 DIAGNOSTIC FEATURES OF THE XRT73LC00A ............................................................................. 43

4.1 THE ANALOG LOCAL LOOP-BACK MODE ................................................................................................. 43

4.2 THE DIGITAL LOCAL LOOP-BACK MODE .................................................................................................. 44

4.3 THE REMOTE LOOP-BACK MODE .............................................................................................................. 45

4.4 TXOFF FEATURES ........................................................................................................................................ 46

4.5 THE TRANSMIT DRIVE MONITOR FEATURES ........................................................................................... 47

4.6 THE TAOS (TRANSMIT ALL ONES) FEATURE ........................................................................................... 48