XRT75R12IB datasheet(27/90 Pages) EXAR

27 / 90 page

XRT75R12

REV. 1.0.4

TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR

3.5.4

Interference Tolerance

For E3 mode, ITU-T G.703 Recommendation specifies that the receiver be able to recover error free clock and

data in the presence of a sinusoidal interfering tone signal. For DS3 and STS-1 modes, the same

recommendation is being used. Figure 10 shows the configuration to test the interference margin for DS3/

STS1. Figure 11 shows the set up for E3.

FIGURE 9. LOSS OF SIGNAL DEFINITION FOR E3 AS PER ITU-T G.775.

FIGURE 10. INTERFERENCE MARGIN TEST SET UP FOR DS3/STS-1

FIGURE 11. INTERFERENCE MARGIN TEST SET UP FOR E3.

Actual Occurrence

of LOS Condition

Line Signal

is Restored

Time Range for

LOS Declaration

Time Range for

LOS Clearance

G.775

Compliance

G.775

Compliance

0 UI

10 UI

0 UI

10 UI

255 UI

RTIP/

RRing

RLOS Output Pin

Sine Wave

Generator

Pattern Generator

2 23 -1 PRBS

Attenuator

∑

Test

Equipment

DUT

XRT75R12

DS3 = 22.368 MHz

STS-1 = 25.92 MHz

Cable Simulator

Attenuator 1

Sine Wave

Generator

17.184mHz

Signal Source

223-1 PRBS

Attenuator 2

∑

Test

Equipment

DUT

XRT75R12

Cable Simulator

XRT75R12IB Datasheet(PDF) 27 Page - Exar Corporation

XRT75R12IB Datasheet(HTML) 27 Page - Exar Corporation

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