Table 1 specifies the input
interface requirements. To assist in fault isolation, the input interface
activates a loss-of-signal (LOS) state when the optical data cannot
be detected.
Table 1. Multimode input interface characteristics
| Parameter |
Unit |
Minimum |
Maximum |
| Saturation level 1 |
dBm |
|
-3 |
| Optical Modulation Amplitude (sensitivity) 3 |
mW |
0.015 |
|
| Return Loss 2 |
dB |
12 |
|
Notes:
- Based on any valid 8B/10B code pattern measured at, or extrapolated to, 10-12 BER.
Must meet this specification with worst-case conditions as specified in Table 1 for the output interface and Table 1 for the fiber optic link.
- This measurement is made using a 4-meter single mode duplex jumper
cable and includes only the power in the fundamental mode of the single
mode fiber.
- FC-PI specifies receiver Optical Modulation Amplitude (OMA) instead
of sensitivity and Extinction Ratio (ER). Receiver sensitivity is
the minimum optical average power (Pavg) required, which can be derived
from the equation Pavg = OMA ((ER+1)/2 *(ER-1)). The specified OMA
is equivalent to an average power of -20 dBm at ER = 9dB.
|