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Technical Specifications
10-26
Issue 3 June 2000
Table 10-11. 26-Type OLIU Link Budgets - Multimode Operation
Note:
The maximum Link Budget loss is 19.8 dB.
Multimode fiber operation requires a minimum exit bandwidth of 44 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 44 MHz or greater, then the maximum
link budget values can be used to determine if the loss budget is sufficient for that
fiber.
If planning a new fiber installation, the values given in the table (given for a
number of commercially available fiber bandwidth-distance products) can be
used. Fiber distances are calculated using the 44 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).
Fiber Bandwidth Maximum Span Length (km)
1000 MHz-km 19.8
800 MHz-km 19.8
500 MHz-km 19.8
300 MHz-km 13.6
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