Optional Redundant Power Supply On Smartstack Sts16-20R - Cabletron Systems SmartStack STS16-20R Installation And User Manual

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stack must be equipped with a STS-LM Stacker Link Module and an appropriate
stacker link cable. The SmartStack STS-8SU External Stacker Unit works as a
common backplane switching fabric, which provides 2.2 Gbps of aggregate
bandwidth.
Note: The SmartStack STS16-20D and the SmartStack STS16-20R can be stacked
together with other switches from the STS16-20x family in any desired
combination. All switches in a stack must, however, run the same software version.
Optional Redundant Power Supply on
SmartStack STS16-20R
The SmartStack STS16-20R Token Ring Switch has an input for a backup power
supply (see Figure 22. in Chapter 4, "Installation"). It is compatible with the
SmartStack STS-RPC Redundant Power Center, which can supply back-up power
for up to six switches, when up to six SmartStack STS-PSU Redundant Power
Supply Unit are installed in the chassis. This gives a high degree of resilience to
power supply failures. The SmartStack STS16-20R will switch to the external
power supply if the internal supply fails. The switch monitors the power source and
informs the network management system which supply is in use.
The SmartStack STS-8SU Stacker Unit also accommodates an optional switch
matrix STS-SM, which includes a redundant power supply, ensuring the highest
degree of resilience in the stack of switches.
Caution: The redundant power supply unit SmartStack STS-PSU is not
hot-swappable. Both the SmartStack STS-PSU unit and the switch must be off
before connecting or disconnecting the DC power cable.
SmartStack STS16-20D/STS16-20R Token Ring Switches Installation and User Guide Switch Overview