3-13
Performance Tests
PDH/DSn Internal Transmitter Clock Accuracy & Offset
21 Select FREQUENCY OFFSET [USER OFFSET] [+100PPM]
22 Adjust the Frequency Counter ATTEN and Trigger Level to obtain a
stable reading and ensure that the frequency counter reading is
between 17185641Hz and 17185796Hz.
23 Select FREQUENCY OFFSET [USER OFFSET] [-100PPM]
24 Adjust the Frequency Counter ATTEN and Trigger Level to obtain a
stable reading and ensure that the frequency counter reading is
between 17182205Hz and 17182359Hz.
E4 (139.264Mb/s) Frequency Accuracy
25 Select SIGNAL [140Mb/s] PATTERN [ALL 1’s] on the
display.
26 Adjust the Frequency Counter ATTEN and Trigger Level to obtain a
stable reading and ensure that the frequency counter reading is
between 69631686.5Hz and 69632318.5Hz.
27 Select FREQUENCY OFFSET [+15PPM].
28 Adjust the Frequency Counter ATTEN and Trigger Level to obtain a
stable reading and ensure that the frequency counter reading is
between 69632731Hz and 69633358Hz.
29 Select FREQUENCY OFFSET [-15PPM].
30 Adjust the Frequency Counter ATTEN and Trigger Level to obtain a
stable reading and ensure that the frequency counter reading is
between 69630642Hz and 69631269Hz.
DS1 (1.544Mb/s) Frequency Accuracy
31 Connect the CLOCK OUT port of the PDH/DSn module to the
Frequency Counter.
32 Select SIGNAL [DS1 1.5Mb/s] on the display.
33 Adjust the Frequency Counter ATTEN and Trigger Level to obtain a
stable reading and ensure that the frequency counter reading is
between 1543993Hz and 1544007Hz.
34 Select FREQUENCY OFFSET [+32PPM]
35 Adjust the Frequency Counter ATTEN and Trigger Level to obtain a
stable reading and ensure that the frequency counter reading is
TRANSMIT
TRANSMIT
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