XRT79L71 datasheet(59/441 Pages) EXAR

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PRELIMINARY

XRT79L71

1 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC

REV. P1.0.3

DS3 LINE SIDE PARAMETERS

The XRT79L71 will output pulses that comply with the Isolated DSX-3 Pulse Template requirements per

Bellcore GR-499-CORE. The pulse mask as specified in Bellcore GR-499-CORE is shown below in Figure 11.

Additionally, the Equations that define both the "Upper" and "Lower" curves of the Pulse Template requirement

is presented below in Table 8.

Transmit Intrinsic Jitter ( with Jitter Attenuator in the Transmit path)

0.02

0.03

UIPP

RECEIVER LINE SIDE INPUT CHARACTERISTICS

Receiver Sensitivity (length of cable)

900

1200

feet

Interference Margin

-20

-14

Jitter Tolerance @ Jitter Frequency 800KHz

0.15

0.28

UIPP

Signal level to Declare Loss of Signal

-35

Signal Level to Clear Loss of Signal

-15

Occurence of LOS to LOS Declaration Time

255

Termination of LOS to LOS Clearance Time

255

FIGURE 11. BELLCORE GR-499-CORE PULSE TEMPLATE REQUIREMENTS FOR DS3 APPLICATIONS

TABLE 7: E3 TRANSMITTER LINE SIDE OUTPUT AND RECEIVER LINE SIDE INPUT SPECIFICATIONS

PARAMETER

MIN

TYP

MAX

UNITS

D S 3 P u ls e T e m p la te

-0.2

0.2

0.4

0.6

0.8

1.2

T im e , in UI

Lower Curve

Upper Curve

XRT79L71 Datasheet(PDF) 59 Page - Exar Corporation

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