PEB2256HT datasheet(155/490 Pages) INFINEON

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FALC56 V1.2

PEB 2256

Functional Description T1/J1

Data Sheet

155

2002-08-27

Similar to the receive line interface three different data types are supported:

Figure 50

Transmitter Configuration (T1/J1)

• Ternary Signal

Single-rail data is converted into a ternary signal which is output on pins XL1 and XL2.

Selection between B8ZS or simple AMI coding with zero code suppression (B7

stuffing) is provided. B7 stuffing can be disabled on a per time slot basis (Clear

Channel capability). Selected by FMR0.XC1/0 and LIM1.DRS = 0.

• Dual-rail data PCM(+), PCM(-) at multifunction ports XDOP and XDON with 50% or

100% duty cycle and with programmable polarity. Line coding is done in the same way

as in ternary interface mode. Selected by FMR0.XC1 = 1 and LIM1.DRS = 1.

• Unipolar data on port XOID is transmitted in NRZ (non return to zero) with 100% duty

cycle or in CMI code with or without (SIC3.CMI) preprocessed by B8ZS coding to a

fiber-optical interface. Clocking off data is done with the rising edge of the transmit

clock XCLK (1544 kHz) and with a programmable polarity. Selection is done by

FMR0.XC1 = 0 and LIM1.DRS = 1.

5.4.3

Transmit Jitter Attenuator (T1/J1)

The transmit jitter attenuator DCO-X circuitry generates a "jitter-free" transmit clock and

meets the following requirements: PUB 62411, PUB 43802, TR-TSY 009,TR-TSY 253,

TR-TSY 499 and ITU-T I.431 and G.703. The DCO-X circuitry works internally with the

Table 39

Recommended Transmitter Configuration Values (T1/J1)

Parameter

Characteristic Impedance [

Ω]

100

110

1 (± 1%) [Ω]2

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.

t2 : t1

1 : 2.4

ITS10968

Line

t 1

t 2

XL2

XL1

FALC

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