Cabletron Systems MICROMMAC- User Manual

If multiple cable types exist in network, compensations must be made for 
the different cable attenuations. Type 6 and Type 9 cables can run only 2/3 
the distance of Type 1. Therefore 10 meters of Type 1 

≈

 6.6 meters of Types 

6 and 9.

Table 2-6 shows specifications for the Multimode Fiber Optic Cable 
supported by TPIM-F2

.

The maximum trunk cable length between the MicroMMAC-T and other 
active devices is equal to the maximum drive distance as shown in 
Table 2-6. For passive devices, the combined length of twice the longest 
trunk cable, plus the longest lobe cable attached to the passive ring 
segment, must not exceed the Maximum Drive Distance Trunk Length.

Fiber optic cable must be tested with an attenuation test set adjusted for an 
850 nm wavelength. This test ensures that a cable’s signal loss is within 
acceptable limits. Table 2-6 shows the attenuation for each Multimode 
cable type.

50/125 

µ

m

13.0 dB or less

The maximum allowable fiber 
optic cable length is 2 km 
(2187.2 yards). However, IEEE 
802.5 specifications allow for a 
maximum of 1 km (1093.6 
yards).

62.5/125 

µ

m

16.0 dB or less

100/140 

µ

m

19.0 dB or less