XRT7250 datasheet(17/463 Pages) EXAR

17 / 463 page

XRT7250

DS3/E3 FRAMER IC

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REV. 1.1.1

Mode 3 Operation) ........................................................................................................................................ 345

Figure 163.Illustration of the Terminal Equipment being interfaced to the Transmit Payload Data Input Interface

block of the XRT7250 for Mode 4 (Nibble-Parallel/Loop-Timed) Operation .................................................. 346

Figure 164.Behavior of the Terminal Interface signals between the XRT7250 and the Terminal Equipment

(Mode 4 Operation) ....................................................................................................................................... 347

Figure 165.Illustration of the Terminal Equipment being interfaced to the Transmit Payload Data Input Interface

block of the XRT7250 for Mode 5 (Nibble-Parallel/Local-Time/Frame-Slave) Operation ............................. 349

Figure 166.Behavior of the Terminal Interface signals between the XRT7250 and the Terminal Equipment (E3

Mode 5 Operation) ........................................................................................................................................ 350

Figure 167.Illustration of the Terminal Equipment being interfaced to the Transmit Payload Data Input Interface

block of the XRT7250 for Mode 6 Operation ................................................................................................ 351

Figure 168.Behavior of the Terminal Interface signals between the XRT7250 and the Terminal Equipment (E3

Mode 6 Operation) ........................................................................................................................................ 352

Figure 169.Simple Illustration of the Transmit Overhead Data Input Interface block .................................... 353

Figure 170.Illustration of the Terminal Equipment being interfaced to the Transmit Overhead Data Input Inter-

face (Method 1) ............................................................................................................................................. 357

Figure 171.Illustration of the signal that must occur between the Terminal Equipment and the XRT7250, in order

to configure the XRT7250 to transmit a Yellow Alarm to the remote terminal equipment ............................. 360

Figure 172.Illustration of the Terminal Equipment being interfaced to the Transmit Overhead Data Input Inter-

face (Method 2) ............................................................................................................................................. 362

Figure 173.Behavior of Transmit Overhead Data Input Interface signals between the XRT7250 and the Terminal

Equipment (for Method 2) ............................................................................................................................. 365

Figure 174.LAPD Message Frame Format ................................................................................................... 366

Figure 175.Flow Chart depicting how to use the LAPD Transmitter (LAPD Transmitter is configured to re-trans-

mit the LAPD Message frame repeatedly at One-Second intervals) ............................................................. 371

Figure 176.Flow Chart depicting how to use the LAPD Transmitter (LAPD Transmitter is configured to transmit

a LAPD Message frame only once). ............................................................................................................. 372

Figure 177.A Simple Illustration of the Transmit E3 Framer Block and the associated paths to other Functional

Blocks ........................................................................................................................................................... 374

Figure 178.Approach to Interfacing the XRT7250 Framer IC device to the XRT7300 DS3/E3/STS-1 LIU ... 377

Figure 179.A Simple Illustration of the Transmit E3 LIU Interface block ....................................................... 378

Figure 180.The Behavior of TxPOS and TxNEG signals during data transmission while the Transmit DS3 LIU

Interface is operating in the Unipolar Mode .................................................................................................. 378

Figure 181.Illustration of AMI Line Code ....................................................................................................... 380

Figure 182.Illustration of two examples of HDB3 Encoding .......................................................................... 380

Figure 183.Waveform/Timing Relationship between TxLineClk, TxPOS and TxNEG - TxPOS and TxNEG are

configured to be updated on the rising edge of TxLineClk ............................................................................ 382

Figure 184.Waveform/Timing Relationship between TxLineClk, TxPOS and TxNEG - TxPOS and TxNEG are

configured to be updated on the falling edge of TxLineClk ........................................................................... 382

Figure 185.A Simple Illustration of the Receive Section of the XRT7250, when it has been configured to operate

in the E3 Mode .............................................................................................................................................. 384

Figure 186.A Simple Illustration of the Receive E3 LIU Interface Block ....................................................... 385

Figure 187.Behavior of the RxPOS, RxNEG and RxLineClk signals during data reception of Unipolar Data .....

386

Figure 188.Illustration on how the Receive E3 Framer (within the XRT7250 Framer IC) being interface to

theXRT7300 Line Interface Unit, while the Framer is operating in Bipolar Mode ......................................... 387

Figure 189.Illustration of AMI Line Code ....................................................................................................... 388

Figure 190.Illustration of two examples of HDB3 Decoding .......................................................................... 388

Figure 191.Waveform/Timing Relationship between RxLineClk, RxPOS and RxNEG - When RxPOS and Rx-

NEG are to be sampled on the rising edge of RxLineClk ............................................................................. 390

Figure 192.Waveform/Timing Relationship between RxLineClk, RxPOS and RxNEG - When RxPOS and Rx-

NEG are to be sampled on the falling edge of RxLineClk ............................................................................. 390

Figure 193.A Simple Illustration of the Receive E3 Framer Block and the Associated Paths to the Other Func-

tional Blocks .................................................................................................................................................. 391

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