363-206-285
Technical Specifications
Issue 3
June 2001
10-33
Notes:
1. Maximum 22F-type MM Link Budget (dB) for multimode operation is 12.0 dB.
2. When two numbers are given, the number before the slash is the specification for
operating under controlled environmental conditions. The number following the slash is
the specification for uncontrolled environmental conditions. If only one number is given,
it applies to both controlled and uncontrolled environmental conditions
3. The 22G4-U will replace the 22F-type and the 22G/22G-U/22G2-U and 22G3-U OLIUs.
The system is dispersion limited for all the fiber bandwidths listed in Table 10-9.
Multimode fiber operation on the DDM-2000 OC-3 Multiplexer requires a minimum exit
bandwidth of 120 MHz to ensure that dispersion loss is kept below acceptable levels. If the
fiber is already installed and the exit bandwidth is measured to be 120 MHz or greater, then
the maximum link budget values (see Notes 1 and 2) can be used to determine if the loss
budget is sufficient for that fiber.
If planning a new fiber installation, the values at the end of the table, given for a number of
commercially available fiber bandwidth-distance products, can be used. Fiber distances are
calculated using the 120 MHz exit bandwidth limit; however, actual exit bandwidths may be
higher for these distances due to the existence of splices. This may permit longer span
lengths to be achieved, for the given fiber bandwidths, than those specified in the table. In
this case, however, the span length can only be increased to the point where the system is
loss limited as specified by the maximum multimode link budget given in the table (1 dB/km
cable is assumed).
Table 10-9.
OC-3 OLIU Link Budget - Multimode Operation
Maximum Span Length (km)
Fiber
Bandwidth
22F/22F-U/
22F2-U
(Note 1)
22D-U
(Note 2)
22G/22G-U/
22G2-U/22G3-U/
22G4-U(Note 3)
1000 MHz-km
800 MHz-km
500 MHz-km
300 MHz-km
6.5
5.1
3.1
1.8
3.6/3.4
3.4/3.3
2.7
1.9
6.5
5.1
3.1
1.8
Summary of Contents for DDM-2000 OC-3
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Page 14: ...xiv Issue 3 June 2001 Contents GL Glossary GL 1 ...
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Page 28: ...Tables xxviii Issue 3 June 2001 A A SONET Overview A 34 SONET Transport Rates A 20 ...
Page 58: ...363 206 285 About This Document lviii Issue 3 June 2001 ...
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