Lucent Technologies DDM-2000 OC-3, Руководство пользователя и обслуживания

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363-206-285
Circuit Pack Descriptions
Issue 3 June 2001 7-153
Table 7-4. 29G-U/29H-U OLIU Link Budgets (Notes)
Notes:
Parameter 29G-U 29H-U
Minimum Wavelength (
λ
Tmin
) 1280 nm 1530 nm
Maximum Wavelength (
λ
Tmax
) 1335 nm 1570 nm
Spectral Width (
δλ
20
) 1.0 nm 1.0 nm
Maximum Transmitter Power
∗
(P
Tmax
)
+1.9 dBm +2.0 dBm
Minimum Transmitter Power (P
Tmin
)
−
2.5 dBm
−
2.5 dBm
Maximum Received Power (P
Rmax
)
−
8.0 dBm
−
8.0 dBm
Minimum Received Power (P
Rmin
)
−
30.5 dBm
−
31.0 dBm
Minimum System Gain (S-R) † 28.0 dB 28.5 dB
Optical Path Penalty (P
O
) ‡ 1.0 dB 1.0 dB
Connector Loss § 1.5 dB 1.5 dB
Unallocated Margin ¶ 1.5 dB 2.0 dB
Minimum Loss Budget
∗∗
8.0 dB 10.0 dB
Maximum Loss Budget †† 24.0 dB 24.0 dB
Maximum Span Length ‡‡ 51 km 96 km
1. All terminology is consistent with TR-253, Iss. 2. All values are worst-case end of life.
2. All specifications for the 29G-U/29H-U meet or exceed long reach (LR) values described
in TR-253, Iss. 2.
∗
Transmit and receive powers are referenced to points S and R as shown in Figure 7-51.
† 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. The 29G-U has 4.0 dB of total margin. Optical path penalty is normally
1.0 dB. The 29H-U has 4.5 dB of total margin. Optical path penalty is normally
1.0 dB, which implies 1800 psec/nm total dispersion. Typical nondispersion fiber has
10 psec/nm km dispersion in the 1550 nm wavelength range.