XRT79L71IB datasheet(91/109 Pages) EXAR

91 / 109 page

XRT79L71

REV. 1.0.0

1-CHANNEL DS3/E3 ATM UNI/PPP/CLEAR-CHANNEL FRAMER IC - HARDWARE

DS3/E3 LIU INTERFACE - LINE SIDE ELECTRICAL CHARACTERISTIC INFORMATION

E3 LINE SIDE PARAMETERS

The XRT79L71 line output at the Transmit Output complies with the pulse template requirements as specified

in ITU-T G.703 for 34.368Mbps operation. The pulse mask as specified in ITU-T G.703 for 34.368Mbps is

shown below in Figure 14.

t10

Clock high to pRD_L high

t11

Clock high to pDBEN_L high

FIGURE 14. PULSE MASK FOR E3 (34.368MBPS) INTERFACE AS PER ITU-T G.703

TABLE 12: E3 TRANSMITTER LINE SIDE OUTPUT AND RECEIVER LINE SIDE INPUT SPECIFICATIONS

PARAMETER

MIN

TYP

MAX

UNITS

TRANSMITTER LINE SIDE OUTPUT CHARACTERISTICS

Transmit Output Pulse Amplitude

(Measured at secondary of the transformer)

0.9

1.0

1.1

Vpk

Transmit Output Pulse Amplitude Ratio

0.95

1.00

1.05

Transmit Output Pulse Width

12.5

14.55

16.5

Transmit Intrinsic Jitter (without Jitter Attenuator in theTransmit path)

0.01

0.015

UIPP

TABLE 11: TIMING INFORMATION FOR THE MICROPROCESSOR INTERFACE, WHEN CONFIGURED TO OPERATE IN THE

IBM POWER PC403 MODE

Test Conditions: TA = 25°C, VCC = 3.3V±5% and 2.5V±5%, unless otherwise specified.

TIMING

DESCRIPTION

MIN.TYP.MAX.

50%

V = 100%

14.55ns

N om inal P ulse

12.1ns

(14.55 - 2.45)

17 ns

(14.55 + 2.45)

8.65 ns

10%

20%

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