Specifications
GTS1063 and GTS1250 GBIC Test Systems Instruction Manual
33
Table 10: Rx Electrical Specifications
Specification
Description
"
Rx_DATA Termination
Both +Rx_DATA and –Rx_DATA Min-Loss outputs must be DC terminated to 50
W
.
The Recovered Clock and Recovered DATA originate from a buffered pickoff of the
"
Rx_DATA signals in the resistive branch of the internal 75-to-50
min-loss conversion
circuitry. If the exRx DATA and –Rx DATA outputs are not properly terminated
coaxially (or with SMA 50
cap terminations) to 50
DC, then severe impedance
mismatch reflections distort the digital data pickoff. It is necessary to terminate the +Rx
DATA and –Rx DATA outputs at all times, even when not in use, to allow the recovered
clock and recovered data to work properly.
n
Rx Recovered CLK and DATA output
level swings
Output level swings are specified for 50
RF cable lengths of
t
0.5 m and
t
0.25 dB
loss in the first 2 GHz frequency range.
Rx DATA output peak-to-peak
minimum:
u
300 mVp-p
maximum:
t
600 mVp-p
Test Method: Optical DATA input pattern is set to 1111100000 repeating (125 MHz
[GTS1250] or 531.25 MHz [GTS1063] square wave: K28.7 repeated) for measuring
maximum swing and to 1010101010 (D21.5 repeated) for minimum swing. A Tektronix
SD-22 sampler (12.5 GHz is used). RF 50
cable used (Tektronix part number
015-0560-00) is relatively short (2 ns). Use optical loopback from GBIC Tx to GBIC Rx for
stimulus.
Rx Recovered CLK output peak-to-peak
minimum:
u
300 mVp-p
maximum:
t
600 mVp-p
Test Method: Optical DATA input pattern is set to 1010101010 (D21.5 repeated). A
Tektronix SD-22 sampler (12.5 GHz is used). RF 50
cable used (Tektronix part number
015-0560-00) is relatively short (2 ns).
Both Rx DATA and Recovered CLK outputs are AC coupled and require external 50
termination for proper output swings. The 50
cable used (Tektronix part number
015-0560-00) is relatively short (2 ns).
Rx rise and fall times
Rx DATA output rise:
t
300 ps
Rx DATA output fall:
t
300 ps
Recovered CLK output rise:
t
300 ps
Recovered CLK output fall:
t
300 ps
Rise times and fall times are defined as the transition duration from 10% to 90% (rise) or
90% to 10% (fall).
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