Multimode Fiber Optic Cable Specifications For The Epim-F1 And Epim-F2 Modules - Cabletron Systems HubSTACK SEHI-34 User Manual

INSTALLATION REQUIREMENTS/SPECIFICATIONS
2.1.3 Multimode Fiber Optic Cable Specifications for the
EPIM-F1 and EPIM-F2 Modules
Table 2-1 shows Multimode Fiber Optic Cable specifications for the
EPIM-F1 and EPIM-F2 modules.
Table 2-1. Multimode Fiber Optic Cable Specifications
Cable Type
50/125 m
62.5/125 m
100/140 m
Attenuation
You must test the fiber optic cable with a fiber optic attenuation test
set adjusted for an 850 nm wavelength. This test verifies that the
signal loss in a cable is within an acceptable level. Table 2-1 shows the
attenuation for each Multimode cable type.
Fiber Optic Budget and Propagation Delay
When determining the maximum fiber optic cable length, the fiber
optic budget delay and total network propagation should be calculated
and taken into consideration before fiber optic cable runs are
incorporated in any network design.
Fiber optic budget is the combination of the optical loss due to the
fiber optic cable, in-line splices, and fiber optic connectors.
Propagation delay is the amount of time it takes data to travel from
the sending device to the receiving device. Total propagation delay
allowed for the entire network is 25.6 sec, if the total propagation
delay between any two nodes on the network exceeds 25.6 sec, then
bridges should be used.
Page 2-4
Attenuation
13.0 dB or less
16.0 dB or less
19.0 dB or less
Maximum Cable Length
The maximum allowable fiber
optic cable length is 2 km
(2187.2 yards). However,
IEEE 802.3 specifications
allow for a maximum of 1 km
(1093.6 yards).