CommScope® Enterprise Data Center Design Guide - Public ...

40
www.commscope.com
Fiber Optic Cable Distances for 1 Gb/s Networks
With the advent of faster electronics, gigabit (1 Gb/s or 1000 Mb/s) backbones with
horizontal links of 100 Mb/s became possible. The 90 meters of horizontal cabling still can
be either twisted pair or multimode fiber, and 62.5 μm fiber can be used for the 300 meter
backbone. When planning a future link of 300 - 1000 meters, consider using high bandwidth
50 µm multimode fiber or single-mode fiber.
Figure 16: TIA 568C Recommendations for 1Gb/s Ethernet
Outlet
90 m
Outlet
300 meters in
collapsed
backbones
Equipment room
(intermediate
crossconnect)
When planning fiber cabling, do not connect fibers of different core diameters into one
another. While transmitting from a 50 µm fiber into a 62.5 µm fiber may not result in a power
loss, going from 62.5 µm to 50 µm will result in a significant loss of 3 to 4 dB, which is over
50% of the optical power at that location.
TABLE 7: 1G/S ETHERNET PERFORMANCE
Fiber
Description
Fiber Optic Cable Distances for 10 Gb/s Networks
10 gigabit (10,000 Mb/s) backbones with horizontal links of 1 Gb/s are becoming
common. While these speeds were possible before with single-mode fiber, the high electronics
costs were a limiting factor. However, new and economical 850 nm Vertical Cavity Surface
Emitting Lasers (VCSELs) make operating these very high speed networks possible over highbandwidth
laser-optimized 50 µm multimode fibers.
Figure 17: TIA 568C Recommended Distance for 10Gb/s Ethernet
Outlet
90 m
Outlet
300 meters in
collapsed
backbones
Equipment room
(intermediate
crossconnect)
Telecommunications Room
(horizontal crossconnect)
Bandwidth (MHz•km)
850/1300 nm
Telecommunications Room
(horizontal crossconnect)
X meters between
crossconnects
(distributed
backbones)
1 Gb/s Range
with 850 nm VCSEL
300 meters 50 µm OM3 multimode
3000+ meters single-mode
total cabled distance (X+Y) between
active equipment shall not exceed
300 meters for multimode fiber
Y meters 50 µm OM3 multimode
2500+ meters single-mode
1 Gb/s Range
with 1300 nm LASER
50 μm OM4 4700*/500 1100 m 600 m
50 μm OM3 2000*/500 1000 m 600 m
50 μm OM2+ 950*/500 800 m 600 m
50 μm OM2 500/500 550 m 550 m
62.5 μm OM1 200/500 275 m 550 m
8.3 μm single-mode NA 2 km and up** 2 km and up**
* Effective Modal Bandwidth (EMB)
** using 1310 & 1550 nm lasers
1020 meters 50 µm OM3 multimode
3000+ meters single-mode
300 meters between
crossconnects
total cabled distance between active
(distributed
equipment shall not exceed 900
backbones)
meters for multimode fiber
600 meters 50 µm OM3 multimode
2500+ meters single-mode
Central
equipment
room
(main crossconnect)
to Local
Access
Central
equipment
room
(main crossconnect)
to Local
Access