XRT75L00 Datasheet, PDF (31/50 Pages) Exar Corporation – E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR

REV. 1.0.2
XRT75L00
E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR
FIGURE 17. INTERFERENCE MARGIN TEST SET UP FOR DS3/STS-1
SINE WAVE
N
GENERATOR
DS3 = 22.368 MHz
STS-1 = 25.92 MHz
ATTENUATOR
Cable Simulator
DUT
XRT75L00
Test Equipment
PATTERN
S
GENERATOR
2²³ - 1 PRBS
FIGURE 18. INTERFERENCE MARGIN TEST SET UP FOR E3.
NOISE
N
GENERATOR
ATTENUATOR 1 ATTENUATOR 2
Pattern
S
Generator
Cable Simulator
DUT
XRT75L00
Test Equipment
MODE
E3
DS3
STS-1
TABLE 9: INTERFERENCE MARGIN TEST RESULTS
CABLE LENGTH (ATTENUATION)
INTERFERENCE TOLERANCE
0 dB
-14 dB
12 dB
-18 dB
0 feet
-17 dB
225 feet
-16 dB
450 feet
-16 dB
0 feet
-16 dB
225 feet
-15 dB
450 feet
-15 dB
29