Cabletron Systems MICROMMAC, 42T The maximum allowable fiber, optic cable length is 2 km, yards

REQUIREMENTS/SPECIFICATIONS

Mixed Cable Types

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.

2.1.3Multimode Fiber Optic Cable Specifications

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

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Table 2-6. Multimode Fiber Optic Cable Specifications

Cable Type Attenuation Maximum Drive Distance

50/125 ∝m	13.0 dB or less	The maximum allowable fiber
		optic cable length is 2 km
62.5/125 ∝m	16.0 dB or less
		(2187.2 yards). However, IEEE
100/140 ∝m	19.0 dB or less
		802.5 specifications allow for a
		maximum of 1 km (1093.6
		yards).

Maximum Trunk Lengths

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.

Attenuation

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.

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