Performance Tests
1–104
TDS 500D, TDS 600C, TDS 700D & TDS 714L Performance Verification and Specifications
Figure 1–44: Optical impulse response for OC–12 SONET Reference Receiver
NOTE. In Figure 1–44, 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 1–45 on page 1–105). The unsigned D dB readout should be at or
between the upper and lower limits shown in Table 1–11 on page 1–106
(note that the entries in the table are signed numbers, but the D dB
readout is not) for the mask that is turned on.
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