Operating Basics
16
GTS1063 and GTS1250 GBIC Test Systems Instruction Manual
The GBIC Test System also uses the Tx Fault and Rcv LOS indicators to
indicate GBIC voltage and current overloads (I Overload and V Overload).
During an overload of the GBIC port receptacle supplies (example: if a Vdd
shorted GBIC is plugged in), the RX LOS and TX FAULT indicators blink.
These signals and their definitions are discussed in more detail in GBIC
Overload Flags and Supply Monitor Signals on page 20.
When the GBIC Test System detects an overload of the GBIC supply, it blinks
the overload indicator and shuts down the GBIC VDD +5 V supply. To reset this
latched overload condition, remove the overload (such as uninstalling a shorted
GBIC) and press the GBIC Overload RESET button (see Figure 4 on page 10).
Rear Panel
The rear panel is shown in Figure 6. The rear panel contains the power connec-
tor, the power switch, the Ext Clk Input connector, the Tx JITTER INPUT
connector, and the REMOTE INTERFACE connector.
Remote Interface (Remote Tx Pattern Selection,
GBIC MOD_DEF Interface, GBIC Rx and Tx
Flags, and GBIC I and V Monitor) signals.
Power Switch
Power Connector
Ext Clk IN
Figure 6: Rear Panel of GTS1250
This is an input through which you can supply a DC coupled signal to modulate
the digital decision threshold of the ECL logic gates just prior to the GBIC
differential inputs. Modulation of the decision threshold modulates the horizontal
timing of the data edges of the transmitted pattern. The higher the amplitude of
the JITTER IN signal, the greater the horizontal timing jitter in the Tx output
data edges. The transfer function (V
p-p
corresponding to jitter time p-p) level
limits, and frequency coupling limits are defined in the External Tx Jitter Input
Specifications on page 32.
GBIC Overload Indicators
OVERLOAD RESET
Tx JITTER INPUT
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com