To Next Page

To Previous Page

3-206

Performance Tests

SONET Frequency Offsets (Option 120)

Speciﬁcations

Description

The SONET Transmitter Offset Clock is checked for range and accuracy using a

Frequency Counter to measure the STS-3 Data rate. This gives an indirect measure

of the transmitter clock frequency as the data is clocked by the internal 10MHz

clock oscillator. A measurement with no offset is performed to establish a reference

Clock frequency. The frequency accuracy is then measured over the speciﬁed offset

range. The STS-3 Framing is disabled during this test using the

function of the HP 37717C.

Equipment Required

Procedure

1. Recall the HP 37717C DEFAULT SETTINGS as shown on 3-2.

2. Connect the OUT port to the Frequency Counter terminated in 75Ω (use the T

connector).

Range ±999 ppm

Resolution 0.1 ppm

Accuracy 0.02 ppm

MODULE DEBUG

Frequency Counter : HP 5335A Opt 010

T Connector : HP 1250-0781

HP 37717C Calibration Manual

Other manuals for HP 37717C