PEF3452 datasheet(39/71 Pages) INFINEON

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PEF 3452

TE3-LIU V1.3

Interface Description

Preliminary Data Sheet

2001-12-05

PRELIMINARY

4.2

Transmitter

The serial bit stream is then processed by the transmitter which has the following

functions:

• generation of AMI, B3ZS (DS3/STS-1) or HDB3 (E3) coded signals

• all-ones generation (alarm indication signal)

4.2.1

Transmit Line Interface

The received data stream on pins XDIP (single rail data) or XDIP/XDIN (dual rail data) is

converted into a ternary signal which is output on pins XL1 and XL2. In E3 mode the

HDB3 and AMI line code are supported, in DS3/STS-1 mode the B3ZS and AMI is

supported.

Figure 13

Transmitter Configuration

The external components are the same for DS3, STS-1 and E3 applications. Transmit

return loss requirements for E3 defined in ETS 300 166 are fulfilled. Pulse mask

Table 11

External Component Values for Transmitter

Parameter

Characteristic Line Impedance [

Ω]

DS3

STS-1

R1 (± 1 %) [Ω]

37.51)

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 for the output serial resistors.

Cp [pF]

372)

This value includes all parasitic capacitances on the secondary side of the transformer.

t2 : t1

1: 1

TE3-LIUTM

XL1

XL2

t1 : t2

F0079

Ω

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