XRT72L13 datasheet(14/370 Pages) EXAR

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XRT72L13

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M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC

REV. P1.0.6

PRELIMINARY

XII

RXDS3 LAPD CONTROL REGISTER (ADDRESS = 0X18) ............................................................................ 339

RXDS3 LAPD CONTROL REGISTER (ADDRESS = 0X18) ............................................................................ 340

5.0 Channelized (M13) Mode Operation of the XRT72L13 ................................................................ 341

M23 CONFIGURATION REGISTER (ADDRESS = 0X07) ................................................................................ 341

5.1 AN OVERVIEW OF CHANNELIZED OPERATION ................................................................................................... 341

5.1.1 In North American Applications .......................................................................................................... 341

Figure 116. Simple Illustration of the Overall Scheme to MUX 28 DS1 signals into a DS3 signal ......

341

Figure 117. Simple Illustration of the Overall Scheme to DEMUX a DS3 signal into 28 DS1 signals .

342

5.1.2 .ITU-T G.747 Applications .................................................................................................................. 342

Figure 118. Simple Illustration of the Overall Scheme to MUX 21 E1 signals into a DS3 signal . 342

Figure 119. Simple Illustration of the Overall Scheme to DEMUX 21 E1 signals from a DS3 signal ..

343

5.1.3 Real Configuration Options Offered by the XRT72L13 ...................................................................... 343

5.2 CHANNELIZED OPERATION IN THE TRANSMIT DIRECTION .................................................................................. 343

5.2.1 Channelized Operation, while the XRT72L13 is operating in the “M13” Framing Format. ................. 343

M12 DS2 # 1 CONFIGURATION REGISTER (ADDRESS = 0X1A) .................................................................. 344

Figure 120. Illustration of M12 MUX #1 being configured to operate in the “DS1” Mode ............. 344

Figure 121. Illustration of the DS2 Framing Structure ..................................................................... 345

Figure 122. The DS2 Payload Bits ...................................................................................................... 345

M12 DS2 # 1 CONFIGURATION REGISTER (ADDRESS = 0X1A) .................................................................. 347

M12 DS2 # 1 AIS REGISTER (ADDRESS = 0X21) ...................................................................................... 347

M23 TX DS2 AIS REGISTER (ADDRESS = 0X08) ...................................................................................... 347

M12 DS2 # 1 CONFIGURATION REGISTER (ADDRESS = 0X1A) .................................................................. 348

Figure 123. Illustration of the M12 MUX # 1 being configured to operate in the “G.747” Mode .. 348

Figure 124. Illustration of the “ITU-T G.747 Framing” Structure ..................................................... 349

Figure 125. The “ITU-T G.747” Payload Bits ..................................................................................... 350

M12 DS2 # 1 CONFIGURATION REGISTER (ADDRESS = 0X1A) .................................................................. 351

M12 DS2 # 1 AIS REGISTER (ADDRESS = 0X21) ...................................................................................... 351

M23 TX DS2 AIS REGISTER (ADDRESS = 0X08) ...................................................................................... 351

M12 DS2 # 1 CONFIGURATION REGISTER (ADDRESS = 0X1A) .................................................................. 352

5.2.2 Channelized Operation, while the XRT72L13 is operating in the “C-Bit Parity” Framing Format. ...... 352

5.3 CHANNELIZED OPERATION IN THE RECEIVE DIRECTION .................................................................................... 352

5.3.1 Channelized Operation, while the XRT72L13 is operating in the “M13” Framing Format. ................. 352

M12 DS2 # 1 CONFIGURATION REGISTER (ADDRESS = 0X1A) .................................................................. 352

DS2 # 1 FRAMER STATUS REGISTER (ADDRESS = 0XA3) ......................................................................... 353

DS2 # 1 FRAMER STATUS REGISTER (ADDRESS = 0XA3) ......................................................................... 354

M12 DS2 # 1 CONFIGURATION REGISTER (ADDRESS = 0X1A) .................................................................. 354

M12 DS2 # 1 CONFIGURATION REGISTER (ADDRESS = 0X1A) .................................................................. 355

DS2 # 1 FRAMER STATUS REGISTER (ADDRESS = 0XA3) ......................................................................... 355

DS2 # 1 FRAMER STATUS REGISTER (ADDRESS = 0XA3) ......................................................................... 356

5.3.2 Channelized Operation, while the XRT72L13 is operating in the “C-Bit Parity” Framing Format. ...... 356

5.4 DIAGNOSTIC OPERATIONS - CHANNELIZED MODE ............................................................................................ 356

5.4.1 M12 MUX (DS1 or E1) Loop-backs .................................................................................................... 356

5.4.2 M23 MUX (DS2 or G.747) Loop-backs .............................................................................................. 356

5.5 CHANNELIZED MODE INTERRUPTS ................................................................................................................... 356

ORDERING INFORMATION .................................................................................................................. 357

PACKAGE DIMENSIONS ............................................................................................... 357

REVISIONS ............................................................................................................................................... 358

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