3Com 3C63400-3AC-C - PathBuilder S700 Switch Reference Manual page 32

18 C 2: I
HAPTER NSTALLATION
3Com recommends that AC/DC power and office alarms be connected through a
Fuse and Alarm Panel mounted above the PathBuilder S700.
The PathBuilder S700 supports six load-sharing power supplies and requires a
minimum of three power supply modules for operation. Table 7 indicates how
many I/Os (network or user interfaces) are supported based on the number of
power supplies and the shelf configuration: non-redundant (1 MCPU module and
1 STX module) or redundant (2 MCPU modules and 2 STX modules),
The redundant configuration (2 MCPU modules and 2 STX modules is not
supported in Release 2.03 but will be in subsequent releases.
Table 7 Power Supply Requirements
Total # of
Power Supply Maximum # of I/Os
Modules (Non-Redundant System
3 5
4 8
5 11
6 14
To make AC/DC power connections, follow these steps:
1 Plug the power supply modules directly into the backplane of the shelf. Their low
voltage DC outputs are bussed across the backplane to the other modules. Make
sure that the power supply modules and the fan tray are in the shelf and that they
are fully seated in their backplane connectors.
CAUTION: Before servicing the unit and handling AC/DC power leads, disconnect
all power supply cords. Always have a partner close by who is familiar with first aid
for electrical shock.
WARNING: DC Units are to be installed only in Restricted Access Areas (dedicated
equipment rooms, equipment closets, etc.) in accordance with Articles 110-16 or
110-17, and 110-18 of the National Electrical Code, ANSI/NFDA No.70.
2 Turn off the AC/DC power source and connect the AC/DC leads to the front of the
shelf. Dress the leads to the rack leaving a service loop.
3 Turn on the AC/DC power and verify that the POWER indicators on both Power
Supply Modules are on and that the fans are running.
Maximum # of I/Os
(Redundant System)
4
7
11
14