peb2256 Infineon Technologies Corporation, peb2256 Datasheet - Page 95
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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4.4.2
The analog transmitter transforms the unipolar bit stream to ternary (alternate bipolar)
return to zero signals of the appropriate programmable shape. The unipolar data is
provided by the digital transmitter.
Figure 23
Table 21
Parameter
R
t2 : t1
1)
Similar to the receive line interface three different data types are supported:
• Ternary Signal
• Dual-rail data PCM(+), PCM(–) at multifunction ports XDOP/XDON with 50% or 100%
• Unipolar data on port XOID is transmitted either in NRZ (Non Return to Zero) with
Data Sheet
1
This value refers to an ideal transformer without any parasitics. Any transformer resistance or other parasitic
resistances have to be taken into account when calculating the final value of the output serial resistors.
Single-rail data is converted into a ternary signal which is output on pins XL1 and XL2.
The HDB3 and AMI line code is employed. Selected by FMR0.XC1/0 and
LIM1.DRS = 0.
duty cycle and with programmable polarity. Line coding is done in the same way as in
ternary interface mode. Selected by FMR0.XC1/0 and LIM1.DRS = 1.
100% duty cycle or in CMI (Code Mark Inversion or known as 1T2B) Code with or
without (FMR3.CMI) preprocessed HDB3 coding to a fiber-optical interface. Clocking
off data is done with the rising edge of the transmit clock XCLK (2048 kHz) and with
a programmable polarity. Selection is done by FMR0.XC1 = 0 and LIM1.DRS = 1.
( ± 1%) [ Ω ]
Transmit Line Interface (E1)
Transmitter Configuration (E1)
Recommended Transmitter Configuration Values (E1)
Line
t
1
t
2
95
R
R
1
1
Characteristic Impedance [ Ω ]
1 : 2.4
XL1
XL2
7.5
120
1)
FALC
Functional Description E1
R
ITS10968
FALC56 V1.2
1 : 2.4
7.5
PEB 2256
75
2002-08-27
1)
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