363-206-285
Technical Specifications
Issue 3 June 2001
10-31
Table 10-8. 22F/22F-U/22F2-U, 22G-U, 22G2-U, 22G3-U, and 22G4-U OLIU Link Budgets
Parameter (Note)
22F/22F-U/
22F2-U 22G-U 22G2-U 22G3-U 22G4-U*
Minimum Wavelength (λ
Tmin
) 1260 nm 1272 nm 1272 nm 1280 nm 1280 nm
Maximum Wavelength (λ
Tmax
) 1360 nm 1350 nm 1350 nm 1335 nm 1335 nm
Spectral Width (δλ
rms
) 7.7 nm 3.0 nm 3.0 nm 4.0 nm 1.0 nm
¶¶
Maximum Transmitter
Power†(P
Tmax
)
−8.0 dBm 0.0 dBm 0.0 dBm 0.0 dBm 0.0 dBm
Minimum Transmitter Power (P
Tmin
) −15.0 dBm −7.0 dBm −7.0 dBm −5.0 dBm −5.0 dBm
Maximum Received Power (P
Rmax
) −7.0 dBm −7.0 dBm 0.0 dBm 0.0 dBm 0.0 dBm
Minimum Received Power (P
Rmin
) −34.0 dBm −34.0 dBm −34.0
dBm
−34.0
dBm
−34.0
dBm
Minimum System Gain (S-R)‡ 19.0 dB 27.0 dB 27.0 dB 29.0 dB 29.0 dB
Optical Path Penalty (P
O
)§ 1.0 dB 1.0 dB 1.0 dB 1.0 dB 1.0 dB
Connector Loss¶ 1.5 dB 1.5 dB 1.5 dB 1.5 dB 1.5 dB
Unallocated Margin∗∗ 1.5 dB 1.5 dB 1.5 dB 1.5 dB 1.5 dB
Minimum Loss Budget 0.0 dB 7.0 dB 0.0 dB 0.0 dB 0.0 dB
Maximum Loss Budget‡‡ 15.0 dB 23.0 dB 23.0 dB 25.0 dB 25.0 dB
Maximum Span Length§§ 33 km 51 km 51 km 55 km 55 km
Note: All terminology is consistent with TR-253, Issue 2. All specifications for the 22F OLIU meet
or exceeds intermediate reach (IR) values described in TR-253, Issue 2.
* The 22G4-U OLIU is fully compliant with SONET long reach applications. It is fully
compatible with the 22F-type, 22G-U, 22G2-U, and 22G3-U OLIUs and will replace
them.
†Transmit and receive powers are referenced to points S and R as shown in Figure 10-2.
‡ The minimum system gain for the DDM-2000 already takes into account aging,
temperature, and manufacturing tolerances as these figures are built into the minimum
transmitter power. The DDM-2000 system gain can, thus, not be directly compared with
the DDM-1000 system gain because the DDM-1000 system gain does not include all
of these effects. A similar penalty, called eye margin, is subtracted from the
DDM-1000 loss budget after the value of system gain is determined.
§ Optical path penalty includes 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 typically specified from 0 dB to 3 dB.
‡‡ Budget available for both station and transmission cable and splices.
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