XRT83SL314 datasheet(39/83 Pages) EXAR

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XRT83SL314

14-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT

REV. 1.0.1

NOTE: VDD=3.3V ±5%, TA=25°C, Unless Otherwise Specified

4.2

HDB3/B8ZS Encoder

In single rail mode, the LIU can encode the TPOS input signal to AMI or HDB3/B8ZS data. In E1 mode and

HDB3 encoding selected, any sequence with four or more consecutive zeros in the input will be replaced with

000V or B00V, where "B" indicates a pulse conforming to the bipolar rule and "V" representing a pulse violating

the rule. An example of HDB3 encoding is shown in Table 9. In T1 mode and B8ZS encoding selected, an

input data sequence with eight or more consecutive zeros will be replaced using the B8ZS encoding rule. An

example with Bipolar with 8 Zero Substitution is shown in Table 10.

TABLE 8: TIMING SPECIFICATIONS FOR TCLK/TPOS/TNEG

PARAMETER

SYMBOL

MIN

TYP

MAX

UNITS

TCLK Duty Cycle

TCDU

Transmit Data Setup Time

TSU

Transmit Data Hold Time

THO

TCLK Rise Time (10% to 90%)

TCLKR

TCLK Fall Time (90% to 10%)

TCLKF

TABLE 9: EXAMPLES OF HDB3 ENCODING

NUMBER OF PULSES BEFORE

NEXT 4 ZEROS

Input

0000

HDB3 (Case 1)

Odd

000V

HDB3 (Case 2)

Even

B00V

TABLE 10: EXAMPLES OF B8ZS ENCODING

CASE 1

PRECEDING PULSE

NEXT 8 BITS

Input

00000000

B8ZS

000VB0VB

AMI Output

000+-0-+

Case 2

Input

00000000

B8ZS

000VB0VB

AMI Output

000-+0+-

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