PEB22554 SIEMENS [Siemens Semiconductor Group], PEB22554 Datasheet - Page 61

• Manufacturer Part Number: PEB22554
• Description: ICs for Communications
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

Transmit Line Interface
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 22
Transmitter Configuration
Recommended Transmitter Configuration Values
Parameter
R
t2 : t1
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
• Unipolar data on port XOID will be transmitted either in NRZ (Non Return to Zero) with
Semiconductor Group
1
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.
100 % duty cycle and with programmable polarity. Line coding is done in the same
way as in the ternary interface. 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 fibre 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 %) [ ]
Line
t
1
t
2
61
R
R
1
1
120
7.5
1 : 2.4
Characteristic Impedance [ ]
XL1
XL2
FALC
Functional Description E1
R
ITS10968
75
7.5
1 : 2.4
PEB 22554
09.98