Appendix A: Specifications
ST112 SONET Transmission Test Set
A–5
Transmitter Clock
Internal Clock
Rates/Accuracy
SONET
51.84 MHz ± 10 ppm
DS3
44.736 Mhz ± 10 ppm
DS1
1.544 MHz ± 50 ppm
for instrument calibrated within 12 months
External Clock Reference
(rear panel)
Rates/Accuracy
“52 Mb/s”
51.84 MHz ± 100 ppm
“155 Mb/s”
155.52 MHz ± 20 ppm
“BITS DSX1”
1.544 MHz ± 5 ppm
Recovered Clock
Loop timing
Clock is recovered from received SONET Line signal.
Receive Input
Electrical Input
Data Rates
DSX-1:
1.544 Mb/s
DSX-3:
44.736 Mb/s
STSX-1: 51.84 Mb/s
Data Formats
DSX-1:
AMI, B8ZS
DSX-3:
B3ZS
STSX-1: B3ZS
Signal
Sensitivity
DSX-1:
2.7 Vpk min to 3.3 Vpk max
DSX-1 Monitor:
20 dB of flat loss below DSX-1
DSX-3:
0.25 Vpk min to 0.6 Vpk max
DSX-3 Monitor:
20 dB of flat loss below DSX-3
STSX-1:
0.25 Vpk min to 0.6 Vpk max
STSX-1 Monitor:
20 dB of flat loss below STSX-1
Signal
Equalization
DSX-3/STSX-1:
Cross-connect equalization for 450 feet of AT&T 728A cable.
Impedance/Connector
DSX-1:
Balanced, 100 ohm, WECO310 jack.
DSX-3/STSX-1: Unbalanced, 75 ohm, BNC
Rear Panel Input
Input for an external STS-1 or STS-3 clock source (Rates/accuracy
listed under the External Clock Reference).
Input for an external DS1 or DS3 to be mapped into a higher level
SONET signal.
Rates/Accuracy
“DSX3 INPUT”:
51.84 MHz ± 20 ppm
Data Line Code
“BITS DSX1 INPUT”:
AMI, B8ZS
“DSX3 INPUT”:
B3ZS
Clock (for transmitter)
“52 Mb/s INPUT”:
800 MV pk-pk
“155 Mb/s INPUT”:
800 MV pk-pk
Impedance/Connector
“52 Mb/s INPUT”:
AC-coupled, 50 ohm, BNC
“155 Mb/s INPUT”:
AC-coupled, 50 ohm, BNC
“BITS DSX1 INPUT”:
Balanced, 100 ohm, WECO310 jack
“DSX3 INPUT”:
Unbalanced, 75 ohm, BNC
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