Technical Specifications
Issue 8.0 July 2002
10-21
Note:
The output of the OC3 (1.3 STD) circuit pack is shipped with a 7.1-dB LBO. For spans greater than 15-dB,
replace the 7.1-dB LBO with a 0-dB LBO. The 7.1-LBO (or equivalent) optical attenuation must be used for
optical loopbacks.
* 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 10-13. OC-3 Line Loss Budget Specifications (Note)
Parameter 1.31 µm Standard Performance
Maximum Transmitter Power (P
Tmax
)* 0.0 dBm
Minimum Transmitter Power (P
Tmin
) −7.0 dBm
Maximum Received Power (P
Rmax
) −7.0 dBm
Receiver Sensitivity (P
Rmin
) −34.0 dBm
MinimumSystemGain(S-R)†27.0 dB
Optical Path Penalty (P
O
)‡ 1.0 dB
Connector Loss§ 1.5 dB
Unallocated Margin¶ 1.5 dB
Maximum Loss Budget** 23.0 dB
Minimum Loss Budget 7.0 dB
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