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Figure 2-6
Green LED on power
supply lights up
Blowers start running
Yellow FLT LED goes out;
green RDY LED lights up
Switch card master
runs shell;
NP boots itself
Installing Modems
You should install a modem for each switch card in the LS2020 chassis. In the event that an
operational problem causes a node to be isolated from the rest of the network, the modem may be
the only means available for communicating with that node.
The modem connects to the modem port on the modem/console assembly bulkhead at the back of
the LS2020 chassis, using the modem cable described in the LightStream 2020 Site Planning and
Cabling Guide.
LightStream 2020 Power-up Sequence
Turn on
LS2020 power
TCS powers up;
LEDs on
each card light up
Switch cards arbitrate
~5 seconds
to select master
POST
Yes
passes ?
TCS slaves enable power
on cards; VCC LEDs light
up to indicate local power
on each card
POST executes;
yellow FLT LED lights up;
green RDY LEDs blink on
each card while POST runs
No
Yellow FLT LED lights up;
green RDY LED goes out
Installing Modems
Hardware Installation 2-13
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