User's Manual

PN 8100-40 LGCell 4.0 Installation, Operation, and Reference Manual B-3
620004-0 Rev. B
Backbone Wiring
B.2 Backbone Wiring
The backbone cabling provides the interconnection between the telecommunications
closets and the equipment rooms and entrance facilities. The backbone cabling is also
a star topology with the maximum cable length being media and application-depen-
dent.
The backbone cable typically is second to horizontal cables in terms of the amount of
cable deployed. The cable selected should accommodate a minimum of one to several
network planning periods.
HC
MC
IC
62.5/125 µm Optical Fiber Cable
3000m (9843 ft.)
500m
(1640 ft.)
2500m
(8202 ft.)
HC
MC
IC
2000m (6560 ft.)
Maximum
500m
(1640 ft.)
Maximum
1500m
(4920 ft.)
Note 1
TC
MC
IC
800m (2624 ft)
Maximum
500m
(1640 ft.)
Maximum
300m
(984 ft.)
Note 2
HC
IC/
MC
90m (295 ft)
Maximum
Multi-Mode Optical Fiber Cable
62.5/125 micron Optical Fiber Cable
100Ohm UTP Cable for Voice
100Ohm UTP Cable for Data
HC
IC/
MC
90m (295 ft)
Maximum
150Ohm STP-A Cable for Data
HC Horizontal Cross-Connect
MC Main Cross-Connect
IC Intermediate Cross-Connect
Notes:
1. When the HC-to-IC distance is less than maximum, the IC-to-MC distance for optical fiber
can be increased accordingly but the total distance from the HC to the MC shall not exceed
the maximum of 2000 m (6600 ft).
2. When the HC-to-IC distance is less than maximum, the IC-to-MC distance for UTP cable
can be increased accordingly but the total distance from the HC to the MC shall not exceed
the maximum of 800 m (2640 ft). For voice applications only.