peb22504 Infineon Technologies Corporation, peb22504 Datasheet - Page 47

• Manufacturer Part Number: peb22504
• Description: Quad Line Interface Unit For E1dt1dj1 Quadliu
• Manufacturer: Infineon Technologies Corporation

PEB 22504
QuadLIU V1.1
Interface Description
4.2.4
Programmable Pulse Shaper and Line Build-Out
In long-haul applications, the transmit pulse masks are optionally generated according
to FCC68 and ANSI T1.403 for T1 applications. To reduce the crosstalk on the received
signals, the QuadLIU™ can place a transmit attenuator in the data path (LBO, Line Build
Out). Transmit attenuation is selectable to be 0 , -7.5, -15 or -22.5 dB (selected by
register LIM3.LBO(2:1)). ANSI T1.403 defines only 0 to -15 dB (T1/J1 mode only).
The QuadLIU™ includes a programmable pulse shaper to satisfy the requirements of
ITU-T I.431 , ANSI T1. 102, and various DS1, DSX-1 specifications are met. The
amplitude of the pulse shaper is programmable individually via the microprocessor
interface to allow a large number of different pulse templates. Adaption to the line length
is selected by programming the registers XPM(2:0) as shown on
page
77. To reduce
power consumption, the output stage biasing can be reduced (LIM5.XLB = 1). This leads
to slightly reduced slopes.
Data Sheet
47
2001-02