Cabletron Systems FOMIM-32 Manual De Usuario

 

This chapter begins with network design guidelines in Section 2.1, 

 

, that must be met before installing the 

module in a network. It then provides instructions for installing the 
Cabletron Systems Fiber Optic Media Interface Module into the MMAC 
family of modular hubs. 

 

When connecting fiber optic segments to the FOMIM, you must follow 
the network guidelines listed below. Failure to do so may result in 
unsatisfactory network performance.

 

•

The fiber optic link segment should consist of 8/125 – 12/125 

 

µ

 

m 

single mode fiber optic cabling. You can also use 62.5/125 

 

µ

 

m 

multimode cable with the FOMIM. However, optical loss will be 
greater with multimode cable and distances will be limited to 2 km.

•

The fiber optic cable must be tested with a fiber optic attenuation test 
set that is adjusted for a 1300 nm wave length. This test verifies that 
the signal loss in a cable is within an acceptable level of 9.0 dB or less 
for any given single mode fiber optic link.

•

When determining the maximum fiber optic cable length, the fiber 
optic budget (total loss of 9.0 dB or less between stations) and total 
network propagation delay should be calculated and considered before 
fiber runs are incorporated in any network.

Fiber optic budget is the combination of the optical loss due to the 
fiber optic cable, in-line splices, and fiber optic connectors (the loss 
for each splice and connector is typically 1 dB or less).