XRT7250 datasheet(16/463 Pages) EXAR

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DS3/E3 FRAMER IC

XRT7250

REV. 1.1.1

XIV

Figure 131.Illustration of AMI Line Code ...................................................................................................... 286

Figure 132.Illustration of two examples of HDB3 Decoding ......................................................................... 287

Figure 133.Waveform/Timing Relationship between RxLineClk, RxPOS and RxNEG - When RxPOS and Rx-

NEG are to be sampled on the rising edge of RxLineClk ............................................................................. 288

Figure 134.Waveform/Timing Relationship between RxLineClk, RxPOS and RxNEG - When RxPOS and Rx-

NEG are to be sampled on the falling edge of RxLineClk ............................................................................ 289

Figure 135.A Simple Illustration of the Receive E3 Framer Block and the Associated Paths to the Other Func-

tional Blocks ................................................................................................................................................. 289

Figure 136.The State Machine Diagram for the Receive E3 Framer E3 Frame Acquisition/Maintenance Algo-

rithm .............................................................................................................................................................. 291

Figure 137.Illustration of the E3, ITU-T G.751 Framing Format ................................................................... 291

Figure 138.Illustration of the Local Receive E3 Framer block, receiving an E3 Frame (from the Remote Termi-

nal) with a correct BIP-4 Value. .................................................................................................................... 299

Figure 139.Illustration of the Local Receive E3 Framer block, transmitting an E3 Frame (to the Remote Termi-

nal) with the “A” bit set to “0” ........................................................................................................................ 300

Figure 140.Illustration of the Local Receive E3 Framer block, receiving an E3 Frame (from the Remote Termi-

nal) with an incorrect BIP-4 value. ................................................................................................................ 301

Figure 141.Illustration of the Local Receive E3 Framer block, transmitting an E3 Frame (to the Remote Termi-

nal) with the “A” bit-field set to “1” ................................................................................................................. 301

Figure 142.LAPD Message Frame Format ................................................................................................... 304

Figure 143.Flow Chart depicting the Functionality of the LAPD Receiver .................................................... 308

Figure 144.A Simple Illustration of the Receive Overhead Output Interface block ....................................... 309

Figure 145.Illustration of how to interface the Terminal Equipment to the Receive Overhead Data Output Inter-

face block (for Method 1). ............................................................................................................................. 310

Figure 146.Illustration of the signals that are output via the Receive Overhead Output Interface (for Method 1).

312

Figure 147.Illustration of how to interface the Terminal Equipment to the Receive Overhead Data Output Inter-

face block (for Method 2). ............................................................................................................................. 314

Figure 148.Illustration of the signals that are output via the Receive Overhead Data Output Interface block (for

Method 2). .................................................................................................................................................... 315

Figure 149.A Simple illustration of the Receive Payload Data Output Interface block ................................. 316

Figure 150.Illustration of the Terminal Equipment being interfaced to the Receive Payload Data Input Interface

Block of the XRT7250 Framer IC (Serial Mode Operation) .......................................................................... 318

Figure 151.An Illustration of the behavior of the signals between the Receive Payload Data Output Interface

block of the XRT7250 and the Terminal Equipment ..................................................................................... 319

Figure 152.Illustration of the XRT7250 DS3/E3 Framer IC being interfaced to the Receive Section of the Termi-

nal Equipment (Nibble-Parallel Mode Operation) ......................................................................................... 320

Figure 153.Illustration of the signals that are output via the Receive Payload Data Output Interface block (for

Nibble-Parallel Mode Operation). ................................................................................................................. 321

Figure 154.Illustration of the E3, ITU-T G.832 Framing Format. .................................................................. 332

Figure 155.A Simple Illustration of the Transmit Section, within the XRT7250, when it has been configured to

operate in the E3 Mode ................................................................................................................................ 336

Figure 156.A Simple Illustration of the Transmit Payload Data Input Interface Block .................................. 337

Figure 157.Illustration of the Terminal Equipment being interfaced to the Transmit Payload Data Input Interface

block of the XRT7250 for Mode 1 (Serial/Loop-Timed) Operation ............................................................... 340

Figure 158.Behavior of the Terminal Interface signals between the Transmit Payload Data Input Interface block

of the XRT7250 and the Terminal Equipment (for Mode 1 Operation) ......................................................... 341

Figure 159.Illustration of the Terminal Equipment being interfaced to the Transmit Payload Data Input Interface

block of the XRT7250 for Mode 2 (Serial/Local-Timed/Frame-Slave) Operation ......................................... 342

Figure 160.Behavior of the Terminal Interface signals between the XRT7250 and the Terminal Equipment

(Mode 2 Operation) ...................................................................................................................................... 343

Figure 161.Illustration of the Terminal Equipment being interfaced to the Transmit Payload Data Input Interface

block of the XRT7250 for Mode 3 (Serial/Local-Timed/Frame-Master) Operation ....................................... 344

Figure 162.Behavior of the Terminal Interface signals between the XRT7250 and the Terminal Equipment (E3

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