peb22504 Infineon Technologies Corporation, peb22504 Datasheet - Page 37

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

4.1.3
The QuadLIU™ automatically recovers the signals received on pins RL1/2 in a range of
up to -36 dB. The maximum reachable length with a 22 AWG twisted-pair cable is 6000
feet (T1/J1). After reset the QuadLIU™ is in short-haul mode, and received signals are
recovered up to a cable attenuation of -10 dB. Switching to long-haul mode is done by
setting of register bit LIM1.EQON.
Noise filters eliminate the higher frequency part of the received signals. The incoming
data is peak-detected and sliced at 45, 50, 55, or 67% of the peak value (programmable
in four steps by LIM2.SLT(1:0)) to produce the digital data stream. The received data is
then forwarded to the clock and data recovery unit (DPLL) or optionally transferred to
ports RDOP/RDON directly (see LIM2.RD(1:0)).
The current equalizer status is indicated by register RES (Receive Equalizer Status).
4.1.4
RES reports the current receive line attenuation in 25 steps of approximately 1.7 dB (E1)/
1.4 dB (T1/J1) each. The least significant five bits of this register indicate the cable
attenuation in dB. These five bits are only valid together with the most significant two bits
(RES.EV(1:0) = 01) .
Data Sheet
Receive Equalization Network
Receive Line Attenuation Indication
37
Interface Description
QuadLIU V1.1
PEB 22504
2001-02