LightPointe FlightLite 100, Installation And Maintenance Manual

Page: 50 / 59

FlightTransport Installation Guide
4-2 505-016300-00000 Rev A
4.1.1. Network Component Problems
There are a number of network-related problems that can cause the
optical transport systems to malfunction.
Table 4-1: Networking Equipment Problems
Network Problem Effect on the Optical System
Bad network input signal System failure or high BER
Data paths reversed Data In/Out can be reversed in cabling or patch
panels feeding into the linkhead
Cat 5/6 Cable length violation –
limit is 100 meters (300 feet) Low signal and power strength at the link head.
High Error Rate will result.
New network equipment Network equipment and/or network software
added or changed making the interface or signals
incompatible with link head
Network administration changes causing the
network to fail for a reason unrelated to the FSO
system.
Network connection damaged No signal at the link head due to damaged feeder
cables
Free-space optical signal weak Link failure
Back to back Linkheads All linkheads must interface to a network element
in order to autonegotiate the data rate. Two FL
100s will not work in a back to back manner. Add
a switch or other network element between the
linkheads.
4.1.2. Low Free Space Power level between the linkheads
There are a number of environmental problems that can cause the
optical transport systems to malfunction:
ƒ
Fog, snow, or heavy rain
ƒ
Linkhead has been bumped out of alignment
ƒ
Something is blocking the Line of Sight between the units
ƒ
Smoke , vapor or other emissions
ƒ
Heat turbulence (shimmer) during the heat of the day