Poe Ports And Devices; Installing The Chassis - Cisco ASA 5505 Getting Started Manual

Chapter 4 Installing the ASA 5505

PoE Ports and Devices

Installing the Chassis

Step 1
Step 2
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On the ASA 5505, switch ports Ethernet 0/6 and Ethernet 0/7 support PoE devices
that are compliant with the IEEE 802.3af standard, such as IP phones and wireless
access points. If you install a non-PoE device or do not connect to these switch
ports, the adaptive security appliance does not supply power to the ports and the
device must be powered on its own.
These ports are the only ports that can provide power for IP phones or other PoE
devices. However, these ports are not restricted to that use. They can also be used
as Ethernet switch ports, like the Ethernet switch ports numbered 0 through 5. If
a PoE device is not attached, power is not supplied to the port.
When connecting PoE devices, use the following guidelines:
Use straight-through cable only. Using crossover cable does not enable the
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ASA 5505 to provide power to the PoE ports.
Do not disable auto-negotiation (force speed and duplex) on E0/6 and E0/7
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when using them to connect PoE devices. If auto-negotiation is disabled, the
ASA 5505 does not recognize that a PoE device is attached. In this case,
power is not provided to the port.
Be careful when connecting a Cisco PoE device to a non-PoE switch
Note
port (E0/0 through E0/5). If auto-negotiation is disabled for that
switch port, a network loopback might occur with some Cisco
Powered Device (PD) models.
Cisco IP Phone 7970 is always in low-power mode when drawing power from
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the ASA 5505.
To install the ASA 5505, perform the following steps:
Place the chassis on a flat, stable surface. The chassis is not rack mountable.
Connect Port 0 to the public network (that is, the Internet):
Use a yellow Ethernet cable to connect the device to a switch or hub.
a.

PoE Ports and Devices

ASA 5505 Getting Started Guide
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