peb2256 Infineon Technologies Corporation, peb2256 Datasheet - Page 120
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peb2256
Manufacturer Part Number
peb2256
Description
E1/t1/j1 Framer And Line Interface Component For Long And Short Haul Applications
Manufacturer
Infineon Technologies Corporation
Datasheet
1.PEB2256.pdf
(490 pages)
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5.1.3
The FALC56 automatically recovers the signals received on pins RL1/2. The maximum
reachable length with a 22 AWG twisted-pair cable is 2000 m (~6560 ft.). After reset the
FALC56 is in short-haul mode, received signals are recovered up to -10 dB of cable
attenuation. Switching into long-haul mode is done by setting of bit LIM0.EQON = 1.
The integrated receive equalization network recovers signals with up to -36 dB of cable
attenuation in long-haul mode. Noise filters eliminate the higher frequency part of the
received signals. The incoming data is peak-detected and sliced to produce the digital
data stream. The slicing level is software selectable in four steps (45%, 50%, 55%, 67%).
The received data is then forwarded to the clock and data recovery unit.
5.1.4
Status register RES reports the current receive line attenuation in a range from 0 to
-36 dB in 25 steps of approximately 1.4 dB each. The least significant 5 bits of this
register indicate the cable attenuation in dB. These 5 bits are only valid in combination
with the most significant two bits (RES.EV1/0 = 01).
5.1.5
The analog received signal on port RL1/2 is equalized and then peak-detected to
produce a digital signal. The digital received signal on port RDIP/N is directly forwarded
to the DPLL. The receive clock and data recovery extracts the route clock RCLK from
the data stream received at the RL1/2, RDIP/RDIN or ROID lines and converts the data
stream into a single-rail, unipolar bit stream. The clock and data recovery uses an
internally generated high frequency clock based on MCLK.
The recovered route clock or a de-jittered clock can be output on pin RCLK as shown in
Table
See also
Data Sheet
25.
Table 28
Receive Equalization Network (T1/J1)
Receive Line Attenuation Indication (T1/J1)
Receive Clock and Data Recovery (T1/J1)
on page
126
for details of master/slave clocking.
120
Functional Description T1/J1
FALC56 V1.2
PEB 2256
2002-08-27
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