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SmartStack STS-RPC Redundant
Power Center
SmartStack STS-PSU Redundant
Power Supply Unit
Introduction
The SmartStack STS-PSU Redundant PSU is an external
power supply unit for the SmartStack STS16-20RM Token
Ring Switch, the SmartStack STS16-20R Token Ring
Workgroup Switch, and the SmartStack STS16-20FRM
Token Ring Fiber Switch.
The STS-PSU can be table mounted or mounted in the STS-
RPC chassis unit, and is connected to the STS16-20RM/
STS16-20R/STS16-20FRM switch via a low voltage DC
cable. The STS-PSU is used in installations where redundancy
(increased reliability) is required.
The SmartStack STS-RPC Redundant Power Center is a
chassis unit designed to hold from one to six STS-PSUs. The
STS-RPC unit can be table mounted or mounted in any
standard 19" rack.
Figure 1. STS-RPC Front Panel
Package Contents
Your STS-RPC package contains the following items:
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One STS-RPC (with five blind panels)
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One STS-PSU (mounted in the STS-RPC chassis)
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One DC power cable
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One plastic bag containing rubber pads, rack mounting
nuts and an Allen key
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One STS-RPC/STS-PSU Installation Guide (this
document)
Your STS-PSU package contains the following items:
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One STS-PSU Redundant Power Supply Unit
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One DC power cable
•
One STS-RPC/STS-PSU Installation Guide (this
document)
Installing the STS-RPC Unit
Use the following steps when table-mounting the STS-RPC
Redundant Power Center:
1. Mount the four self-adhesive pads in the recesses on the
bottom of the unit.
2. Place the unit on any stable, flat surface. Leave enough
room around the unit for ventilation and access to cables.
Caution: Place no more than three units (switches) directly on
top of any other unit. Doing so may cause damage to the lower
unit.
Use the following steps when rack-mounting the STS-RPC
Redundant Power Center:
1. Open the cap on the front of each bracket cover. Using the
Allen key supplied with the unit, remove the retaining
screws, keeping them for later use. Push the bracket covers
towards the back of the unit and lift them off.
2. Position the STS-RPC unit in the rack. Slide the unit up
and down until the bracket holes line up with the holes in
the rack. Using the screws from the bracket covers and the
nuts supplied with the unit, attach the unit to the rack.
Close the bracket cover caps again to conceal the screws.
Note: Mount the STS-RPC unit in the middle of a stack of
switches so that the DC cable is able to reach all switches.
Installing the STS-PSU Power Supply Unit
The STS-PSU unit can be table mounted or mounted in the
STS-RPC chassis.
If you are table mounting the STS-PSU unit, simply place the
unit on any flat, stable surface. Leave enough room around the
unit for ventilation and access to cables.
If you are mounting the STS-PSU unit in the STS-RPC
chassis, use the following procedure:
1. Select a location for the STS-PSU unit in the STS-RPC
chassis. Any vacant slot can be used.
2. Remove the blind panel by loosening the two
thumbscrews.
3. Slide the STS-PSU unit into the slot and secure the unit
with the two thumbscrews.
Connectors and LEDs
The STS-PSU connectors and LEDs are listed below:
Cabling and Applying Power to the STS-PSU
Caution: Both the SmartStack STS-PSU unit and the STS16-
20RM/STS16-20R/STS16-20FRM switch must be off before
connecting or disconnecting the DC power cable.
Connect one end of the DC cable to the DC outlet on the back
of the STS-PSU unit (either end of the cable can be used).
Connect the other end of the cable to the redundant power
supply connector on the back of the switch (you need one STS-
PSU unit per switch).
Figure 2. SmartStack STS-PSU Back Panel
Name
Description
DC Connector
18-pin connector for the proprietary
DC cable.
AC Connector
Standard AC power receptacle.
Power LED
The power LED is on when the
STS-PSU is receiving power.
Table 1. STS-PSU Connectors and LEDs
