Operating Basics
14
GTS1063 and GTS1250 GBIC Test Systems Instruction Manual
+Rx_DATA and –Rx_DATA.
These outputs are analog 50
W
connections to the
actual –Rx_DATA and +Rx_DATA signals from the GBIC. The received signal
in standard GBIC modules is a 75
W
differential signal. To allow these signals to
easily connect to 50
W
oscilloscopes, each of the 75
W
signals is converted to
50
W
by a 75-to-50
W
MIN-LOSS passive electrical circuit.
These connectors may also be used as inputs. For information on using these
connectors as inputs see Appendix C: Recovering a Clock from an External
Electrical Signal on page 91.
+Rx_DATA
Inside GBIC Test System
Front panel interface
Typical PECL RECEIVE
(+/– Rx_DATA signals)
from GBIC
GBIC
–Rx_DATA
43.2
W
75 W
impedance
front panel
+Rx_DATA output
coax connector
–Rx_DATA output
coax connector
Digital
comparator
receptacle
connector
Clock Recovery
Option
NRZ DATA
Recov. Clk out
NRZ Recov. DATA (retimed)
(Without the Clock Recovery
option, the Recov. DATA out
signal is a buffered digital output
with no clock recovery retiming)
50W
When terminated into a
50
W
environment, these
signal amplitudes are ~
0.423 times the amplitude
of the individual 75
W
signals from the GBIC
"
RX_DATA lines.
75 W
impedance
43.2
W
43.2
W
43.2
W
43.2
W
50 W
impedance
50 W
impedance
50W
43.2
W
Figure 5: Rx_DATA Min–Loss Signal, Recovered Clock, and DATA paths
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