68 Cheetah 10K.7 36GB FC Product Manual, Rev. A
9.6.2 LED driver signals
Fault and Active LED signals are located in the FC-SCA connector (J1) and through the indicator connector
(J6). See Table 34 for the output characteristics of the LED drive signals.
9.6.3 Differential PECL output
The serial PECL output signal voltage characteristics are provided in Table 35. The outputs are not AC coupled
in order to deliver maximum signal without rise and fall time degradation. You must AC couple the receiver to
isolate potentially different DC characteristics of the outputs and the receiver.
Figure 16 provides the data output valid eye diagram relative to the bit cell time. Table 37 lists the data values.
Figure 16. Transmit eye diagram
9.6.4 Differential PECL input
The serial PECL input signal voltage characteristics are provided in Table 36.
Table 34: LED drive signal
State Current drive available Output voltage
LED off, high 0 < I
OH
< 100µA
LED on, low I
OL
< -30 mA 0 < V
OL
< 0.8V
Table 35: Differential PECL output characteristics
Description Parameter
Serial output voltage swing 600 < V
out
< 1300 mV
Table 36: Differential PECL input characteristics
Description Parameter Notes
Serial input voltage swing 400 < V
in
< 2.000 mV AC coupled
Bit Time
Vout (mv)
XMIT Eye
