363-206-305
Technical Specifications
Issue 3 June 2000
10-29
Table 10-13 lists the link budgets for the 28-type OLIU.
Table 10-13. 28-Type OLIU Link Budgets.
Notes:
Parameter
28-Type
Minimum Wavelength (
λ
Tmin
) 1280 nm
Maximum Wavelength (
λ
Tmax
) 1335 nm
Spectral Width (
δ
λ
rms
)
4.0 nm
Maximum Transmitter Power (P
Tmax
) 0.0 dBm
Minimum Transmitter Power (P
Tmin
) -5.0 dBm
Maximum Received Power (P
Rmax
) 0.0 dBm
Minimum Input Power (P
Rmin
) -34.0 dBm
Minimum System Gain (S-R)
‡
29.0 dB
Optical Path Penalty (P
O
)
†
1.0 dB
Connector Loss
∗
1.5 dB
Unallocated Margin
**
1.5 dB
Minimum Loss Budget 0.0 dBm
Maximum Loss Budget 25.0 dB
Maximum Span Length§ 55 km
1.
All terminology is consistent with TR-253, Issue 2. All specifications for
28-type OLIU meets or exceeds long reach (LR) values described in TR-253,
Iss. 2.
* One connector (0.75) on each end is assumed to connect station cable to
outside plant.
†
Optical path penalty includes effects of dispersion, reflection and jitter that
occur on the optical path
‡
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-
100 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.
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