3-9
Cisco ME 3400E Ethernet Access Switch Hardware Installation Guide
OL-16447-01
Chapter 3 Installing and Removing AC- and DC-Power-Supply Modules
Power-Supply Module Installation
Each DC-power input (A ± and B ±) is connected to both power-supply module 1 (PSU 1) and
power-supply module 2 (PSU 2). The power-supply modules cannot be powered independently.
DC inputs and returns are diode-isolated (Figure 3-9).
Figure 3-9 DC-Power-Supply Diagram
Preparing for Installation
Obtain these necessary tools and equipment:
• Ratcheting torque screwdriver with a number-2 and a number-1 Phillips head that exerts up to
15 inch-pounds (in-lb).
• Panduit crimping tool with optional controlled-cycle mechanism (model CT-720, CT-920,
CT-920CH, CT-930, or CT-940CH).
• Wire-stripping tools.
• Copper ground wire (insulated or noninsulated) for the ground connection.
• Dual-hole, right-angle ground lug from the switch accessory kit (for the Cisco ME 3400E-24TS-M
and the Cisco ME 3400EG-12CS-M).
• Dual-hole ground lug from the switch accessory kit (for the Cisco ME 3400EG-2CS-A).
• Four leads of 16-gauge copper wire.
• Four-position DC-terminal-block connector from the accessory kit.
To order a spare or replacement DC-connector, use this source:
• Amphenol ELFF0420E (http://www.amphenol.com/).
Grounding the Switch
To make sure that the equipment is reliably connected to earth ground, follow the grounding procedure
instructions and observe these warnings:
Warning
This equipment must be grounded. Never defeat the ground conductor or operate the equipment in the
absence of a suitably installed ground conductor. Contact the appropriate electrical inspection
authority or an electrician if you are uncertain that suitable grounding is available.
Statement 1024
Warning
When installing or replacing the unit, the ground connection must always be made first and
disconnected last.
Statement 1046
DC A
DC B
PSU-1
PSU-2
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