XRT7250 Datasheet, PDF (15/463 Pages) Exar Corporation – DS3/E3 FRAMER IC

XRT7250 DS3/E3 FRAMER IC
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REV. 1.1.1
Figure 100.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 ................................................................ 238
Figure 101.Behavior of the Terminal Interface signals between the XRT7250 Transmit Payload Data Input In-
terface block and the Terminal Equipment (for Mode 1 Operation) .............................................................. 241
Figure 102.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 .......................................... 242
Figure 103.Behavior of the Terminal Interface signals between the XRT7250 and the Terminal Equipment
(Mode 2 Operation) ....................................................................................................................................... 243
Figure 104.Illustration of the Terminal Equipment being interfaced to the Transmit Payload Data Input Interface
block of the XRT7250 for Mode 3 (Serial/Local-Time/Frame-Master) Operation .......................................... 244
Figure 105.Behavior of the Terminal Interface signals between the XRT7250 and the Terminal Equipment (E3
Mode 3 Operation) ........................................................................................................................................ 245
Figure 106.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 .................................................. 246
Figure 107.Behavior of the Terminal Interface signals between the XRT7250 and the Terminal Equipment
(Mode 4 Operation) ....................................................................................................................................... 247
Figure 108.Illustration of the Terminal Equipment being interfaced to the Transmit Payload Data Input Interface
block of the XRT7250 for Mode 5 (Nibble-Parallel/Local-Timed/Frame-Slave) Operation ........................... 249
Figure 109.Behavior of the Terminal Interface signals between the XRT7250 and the Terminal Equipment (E3,
Mode 5 Operation) ........................................................................................................................................ 250
Figure 110.Illustration of the Terminal Equipment being interfaced to the Transmit Payload Data Input Interface
block of the XRT7250 for Mode 6 (Nibble-Parallel/Local-Timed/Frame-Master) Operation ......................... 251
Figure 111.Behavior of the Terminal Interface signals between the XRT7250 and the Terminal Equipment (E3
Mode 6 Operation) ........................................................................................................................................ 252
Figure 112.Simple Illustration of the Transmit Overhead Data Input Interface block .................................... 253
Figure 113.Illustration of the Terminal Equipment being interfaced to the Transmit Overhead Data Input Inter-
face (Method 1) ............................................................................................................................................. 256
Figure 114.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 ............................. 258
Figure 115.Illustration of the Terminal Equipment being interfaced to the Transmit Overhead Data Input Inter-
face (Method 2) ............................................................................................................................................. 260
Figure 116.Behavior of Transmit Overhead Data Input Interface signals between the XRT7250 and the Terminal
Equipment (for Method 2) ............................................................................................................................. 262
Figure 117.LAPD Message Frame Format ................................................................................................... 263
Figure 118.Flow Chart Depicting how to use the LAPD Transmitter ............................................................. 268
Figure 119.A Simple Illustration of the Transmit E3 Framer Block and the associated paths to other Functional
Blocks ........................................................................................................................................................... 271
Figure 120.Approach to Interfacing the XRT7250 Framer IC device to the XRT7300 DS3/E3/STS-1 LIU ... 276
Figure 121.A Simple Illustration of the Transmit E3 LIU Interface block ....................................................... 277
Figure 122.The Behavior of TxPOS and TxNEG signals during data transmission while the Transmit DS3 LIU
Interface is operating in the Unipolar Mode .................................................................................................. 277
Figure 123.Illustration of AMI Line Code ....................................................................................................... 279
Figure 124.Illustration of two examples of HDB3 Encoding .......................................................................... 279
Figure 125.Waveform/Timing Relationship between TxLineClk, TxPOS and TxNEG - TxPOS and TxNEG are
configured to be updated on the rising edge of TxLineClk ............................................................................ 281
Figure 126.Waveform/Timing Relationship between TxLineClk, TxPOS and TxNEG - TxPOS and TxNEG are
configured to be updated on the falling edge of TxLineClk ........................................................................... 281
Figure 127.A Simple Illustration of the Receive Section of the XRT7250 configured to operate in the E3 Mode
283
Figure 128.A Simple Illustration of the Receive E3 LIU Interface Block ....................................................... 284
Figure 129.Behavior of the RxPOS, RxNEG and RxLineClk signals during data reception of Unipolar Data .....
285
Figure 130.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 ......................................... 286
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