XRT7250 datasheet(14/463 Pages) EXAR

14 / 463 page

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DS3/E3 FRAMER IC

XRT7250

REV. 1.1.1

XII

174

Figure 66.A Simple Illustration of the Transmit DS3 LIU Interface block ...................................................... 175

Figure 67.The Behavior of TxPOS and TxNEG signals during data transmission while the Transmit DS3 LIU In-

terface is operating in the Unipolar Mode ..................................................................................................... 175

Figure 68.Illustration of AMI Line Code ........................................................................................................ 177

Figure 69.Illustration of two examples of B3ZS Encoding ............................................................................ 177

Figure 70.Waveform/Timing Relationship between TxLineClk, TxPOS and TxNEG - TxPOS and TxNEG are

configured to be updated on the rising edge of TxLineClk ........................................................................... 179

Figure 71.Waveform/Timing Relationship between TxLineClk, TxPOS and TxNEG - TxPOS and TxNEG are

configured to be updated on the falling edge of TxLineClk .......................................................................... 179

Figure 72.A Simple Illustration of the Receive Section of the XRT7250, when it has been configured to operate

in the DS3 Mode ........................................................................................................................................... 182

Figure 73.A Simple Illustration of the Receive DS3 LIU Interface Block ...................................................... 183

Figure 74.Behavior of the RxPOS, RxNEG and RxLineClk signals during data reception of Unipolar Data 184

Figure 75.Illustration on how the Receive DS3 Framer (within the XRT7250 Framer IC) being interface to

theXRT7300 Line Interface Unit, while the Framer is operating in Bipolar Mode ......................................... 185

Figure 76.Illustration of AMI Line Code ........................................................................................................ 185

Figure 77.Illustration of two examples of B3ZS Decoding ............................................................................ 186

Figure 78.Waveform/Timing Relationship between RxLineClk, RxPOS and RxNEG - When RxPOS and RxNEG

are to be sampled on the rising edge of RxLineClk ...................................................................................... 187

Figure 79.Waveform/Timing Relationship between RxLineClk, RxPOS and RxNEG - When RxPOS and RxNEG

are to be sampled on the falling edge of RxLineClk ..................................................................................... 188

Figure 80.A Simple Illustration of the Receive DS3 Framer Block and the Associated Paths to the Other Func-

tional Blocks ................................................................................................................................................. 188

Figure 81.The State Machine Diagram for the Receive DS3 Framer block's Frame Acquisition/Maintenance Al-

gorithm .......................................................................................................................................................... 189

Figure 82.A Simple Illustration of the Locations of the Source, Mid-Network and Sink Terminal Equipment (for

CP-Bit Processing) ....................................................................................................................................... 197

Figure 83.Illustration of the Presumed Configuration of the Mid-Network Terminal Equipment ................... 198

Figure 84.Flow Diagram depicting how the Receive FEAC Processor Functions ........................................ 201

Figure 85.LAPD Message Frame Format ..................................................................................................... 202

Figure 86.Flow Chart depicting the Functionality of the LAPD Receiver ...................................................... 204

Figure 87.A Simple Illustration of the Receive Overhead Output Interface block ......................................... 205

Figure 88.Illustration of how to interface the Terminal Equipment to the Receive Overhead Data Output Interface

block (for Method 1). ..................................................................................................................................... 207

Figure 89.Illustration of the signals that are output via the Receive Overhead Output Interface (for Method 1).

210

Figure 90.Illustration of how to interface the Terminal Equipment to the Receive Overhead Data Output Interface

block (for Method 2). ..................................................................................................................................... 212

Figure 91.Illustration of the signals that are output via the Receive Overhead Data Output Interface block (for

Method 2). .................................................................................................................................................... 215

Figure 92.A Simple illustration of the Receive Payload Data Output Interface block ................................... 216

Figure 93.Illustration of the XRT7250 DS3/E3 Framer IC being interfaced to the Receive Terminal Equipment

(Serial Mode Operation) ............................................................................................................................... 218

Figure 94.An Illustration of the behavior of the signals between the Receive Payload Data Output Interface block

of the XRT7250 and the Terminal Equipment (Serial Mode Operation) ....................................................... 219

Figure 95.Illustration of the XRT7250 DS3/E3 Framer IC being interfaced to the Receive Section of the Terminal

Equipment (Nibble-Mode Operation) ............................................................................................................ 220

Figure 96.An Illustration of the Behavior of the signals between the Receive Payload Data Output Interface

Block of the XRT7250 and the Terminal Equipment (Nibble-Mode Operation). ........................................... 221

Figure 97.Illustration of the E3, ITU-T G.751 Framing Format. .................................................................... 234

Figure 98.A Simple Illustration of the XRT7250 Transmit Section when it has been configured to operate in the

E3 Mode ....................................................................................................................................................... 235

Figure 99.A Simple Illustration of the Transmit Payload Data Input Interface Block .................................... 236

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