Cisco Systems 2020 manual Installing Modems

Installing Modems

Figure 2-6 LightStream 2020 Power-up Sequence

Turn on

LS2020 power

Green LED on power

supply lights up

Blowers start running

TCS powers up; LEDs on

each card light up

Switch cards arbitrate

~5 seconds

to select master

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

Yellow FLT LED goes out; green RDY LED lights up

Switch card master

runs shell;

NP boots itself

Yes POST No passes ?

Yellow FLT LED lights up; green RDY LED goes out

H3692

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.

Hardware Installation 2-13