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PEB2256HT Datasheet(PDF) 159 Page - Infineon Technologies AG |
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PEB2256HT Datasheet(HTML) 159 Page - Infineon Technologies AG |
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159 / 490 page  FALC56 V1.2 PEB 2256 Functional Description T1/J1 Data Sheet 159 2002-08-27 which shall be latched on ports XDI and XP(A:D) is programmable by bits SIC2.SICS(2:0), the remaining channel phases are cleared or ignored respectively. The following table gives an overview of the transmit buffer operating modes. 5.4.5 Programmable Pulse Shaper and Line Build-Out (T1/J1) In long-haul applications the transmit pulse masks are optionally generated according to FCC68 and ANSI T1. 403. To reduce the crosstalk on the received signals the FALC56 offers the ability to place a transmit attenuator in the data path. Transmit attenuation is selectable from 0, -7.5, -15 or -22.5 dB (register LIM2.LBO2/1). ANSI T1. 403 defines only 0 to -15 dB. The FALC56 includes a programmable pulse shaper to satisfy the requirements of ANSI T1. 102, also various DS1, DSX-1 specifications are met. The amplitude of the pulse shaper is individually programmable by the microprocessor to allow a maximum of different pulse templates. The line length is selected by programming the registers XPM(2:0) as shown for typical values in the table below. The values are optimized for transformer ratio: 1:2.4; cable: PULP 22AWG (100 Ω); serial resistors: 2 Ω. The transmitter requires an external step up transformer to drive the line. Table 40 Transmit Buffer Operating Modes (T1/J1) Buffer Size TS Offset programming Slip performance bypass enabled no short buffer disabled yes 1 frame enabled yes 2 frames enabled yes Table 41 Pulse Shaper Programming (T1/J1) Range in m Range in ft. XPM0 XPM1 XPM2 XP04- XP00 XP14- XP10 XP24- XP20 XP34- XP30 hexadecimal decimal 0 to 40 0 to 133 D7 22 1 23 22 8 2 40 to 81 133 to 266 FA 26 1 26 23 9 2 81 to 122 266 to 399 3D 37 1 29 25 13 2 122 to 162 399 to 533 5F 3F 1 31 26 15 2 162 to 200 533 to 655 3F CB 1 31 25 18 3 |
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