Cabletron Systems TRXI-22 User Manual

 

Page 2-8

 

Table 2-7 shows Single Mode Fiber Optic Cable specifications for the 
TPIM-F3.

 

The maximum trunk cable length between the TRXI and another 
active device is equal to the Maximum Drive Distance as shown in 
Table 2-7. When the neighboring token ring device is a passive device, 
the combined length of twice the longest trunk cable plus the longest 
lobe cable attached to the passive ring segment cannot exceed the 
Maximum Drive Distance Trunk Length.

 

The fiber optic cable must be tested with a fiber optic attenuation test 
set that is adjusted for a 1300 nm wavelength. This test verifies that 
the signal loss in a cable is within an acceptable level of 10 dB or less 
for any given single mode fiber optic link.

 

Fiber optic budget is the combination of the optical loss due to the 
fiber optic cable, in-line splices, and fiber optic connectors. When 
determining the maximum fiber optic cable length, the fiber optic 
budget (total loss of 10.0 dB or less between stations) should be 
calculated and considered before fiber optic cable runs are 
incorporated in any network design.

Table 2-7. Single Mode Fiber Optic Cable Specifications

 

8/125-12/125 

 

µ

 

m

10.0 dB or less

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