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Technical Specifications
Issue 3 June 2001
10-39
Table 10-14. 26G2-U/27G-U/27G2-U OLIU Link Budgets — Multimode Operation (Notes)
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
Notes:
1. The maximum Link Budget loss is 19.8 dB
2. 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.
3. 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).
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