Technical Specifications
Issue 8.0 July 2002
10-27
OC-12 Line Loss Budgets 10
The FT-2000 OC-48 Lightwave System is designed to meet the OC-12 loss
budget specifications shown in Table 10-15. The transmit and receive powers are
referenced to points S and R in Figure 10-1.
* Transmit and receive powers are referenced to points S and R as shown in Figure 10-1.
† The minimum system gain allows for account aging, temperature, and manufacturing tolerances (these figures
are built into the minimum transmitter power).
‡ Optical path penalty includes the effects of dispersion, reflection, and jitter that occur on the optical path.
§ One connector (0.75 dB) on each end is assumed to connect station cable to outside plant.
¶ Unallocated margin, or safety margin, is usually used for fiber repairs. This can be used to increase the loss
budget if needed.
** The budget is available for both station and transmission cable and splices.
Table 10-15. OC-12 Line Loss Budget Specifications
Parameter 1.31 mm Standard Performance
Maximum Transmitter Power (P
Tmax
)* 2.0 dBm
Minimum Transmitter Power (P
Tmin
) −2.5 dBm
Maximum Received Power (P
Rmax
) −8.0 dBm
Receiver Sensitivity (P
Rmin
) −30.5 dBm
MinimumSystemGain(S-R)† 28.0 dB
Optical Path Penalty (P
O
)‡ 2.0 dB
Connector Loss§ 1.5 dB
Unallocated Margin¶ 1.5 dB
Maximum Loss Budget** 23.0 dB
Minimum Loss Budget 10.0 dB
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