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Performance Tests
Internal SONET Transmitter Clock (Option 120)
Internal SONET Transmitter Clock (Option 120)
Specification
Description
The test uses a Frequency Counter connected to the SDH/SONET Signal Out port to
measure the STS-3 All Ones data rate. This gives an indirect measure of the
transmitter clock frequency as the data is clocked by the internal 10MHz clock
oscillator. The test limits assume the instrument is within the annual calibration
cycle. The STS-3 Framing is disabled for this test using the MODULE DEBUG
function of the HP 37717C.
Equipment Required
Procedure
1. Recall the HP 37717C DEFAULT SETTINGS as shown on 3-2.
2. Connect the HP 37717C OUT port to the Frequency Counter Input A, terminated
in 75Ω (use the T Connector).
Bit Rate Accuracy
155.52 Mb/s
±4.5 ppm
Frequency Counter : HP 5335A Option 010
75Ω Termination : HP 15522-80010
T Connector : HP 1250-0781
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