XRT75L06D Datasheet, PDF (25/103 Pages) Exar Corporation – SIX CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER

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XRT75L06D
REV. 1.0.4
SIX CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER
2.5.4 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 10. INTERFERENCE MARGIN TEST SET UP FOR DS3/STS-1
Sine Wave
N
Generator
DS3 = 22.368 MHz
STS-1 = 25.92 MHz
Pattern Generator ^S
2 ²³ -1 PRBS
Attenuator
∑
Cable Simulator
DUT
XRT75L06D
Test
Equipm ent
FIGURE 11. INTERFERENCE MARGIN TEST SET UP FOR E3.
Sine Wave
Generator
N
17.184mHz
Attenuator 1
Attenuator 2
Signal Source
2²³-1 PRBS S
∑
Cable Simulator
DUT
XRT75L06D
Test
Equipment
21