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Performance Tests
1–98
TDS 500D, TDS 600B & TDS 700D Performance Verification and Specifications
Figure 1–45: Optical impulse response for OC–12 SONET Reference Receiver
NOTE. In Figure 1–45, the left cursor is at the DC frequency. The right cursor is
at the OC-12 data rate of 622 MHz "4 MHz. Also, note that the reference
receiver, RR, designation is beside the 20 mW vertical scale factor.
f. Next, move the cursor currently positioned at the beginning of the record
until the cursor is just right of the DC spike in the response (see
Figure 1–46). The unsigned D dB readout should be at or between the
upper and lower limits shown in Table 1–12 (note that the entries in the
table are signed numbers, but the D dB readout is not) for the mask that
is turned on.