Functional Overview
2–16
ST112 SONET Transmission Test Set
an external DS1 signal by choosing EXT 1.5 BIT FLOAT map mode from the transmitter
mapping menu.
The DSX-3 BNC 75 ohm input connector, on the right, is used for a DS3 input when the EXT
DS3 map mode is selected.
Receiver Connectors, Rear Panel
ECL OUT TTL OUT 100 OHM DIFF INPUT
50 OHM/-2V 2.5V +/- 1V
RECEIVER
52 Mb/s
CLOCK BIT ERR DATA DATA
Figure 2–12. Receiver Connectors, Rear Panel
The rear panel RECEIVER section shown in Figure 2–12 has four BNC connectors. The 52 Mb/s
CLOCK output connector, on the left, provides the 51.84 MHz ECL compatible 50 ohm output
that was recovered from the received STS-1 signal.
The BIT ERR TTL OUT connector will generate a:
•
DS3 RZ pulse for each bit error.
•
DS1 NRZ pulse for each bit error.
•
STS-3c byte wide NRZ pulse for each occurrence of 1 to 8 errors in each byte.
•
STS-12c four byte wide NRZ pulse for each occurrence of 1 to 32 errors in
4 contiguous bytes.
The last two connectors, on the right, are optional data measurement inputs that are used for
differential 52 Mb/s data input.
Standard Connectors, Rear Panel
The standard connectors include the following:
•
Orderwire Handset;
•
DCC;
•
GPIB;
•
RS-232-C;
•
Parallel Printer Port; and,
•
Event Sync TTL output (option).
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