10/100/1000 poe port connections – Cisco 2975 User Manual
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Catalyst 2975 Switch Hardware Installation Guide
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Chapter 2 Switch Installation
10/100/1000 PoE Port Connections
Step 5
Grasp the SFP module, and carefully remove it from the module slot.
Step 6
Place the removed SFP module in an antistatic bag or other protective environment.
10/100/1000 PoE Port Connections
The 10/100/1000 PoE ports use standard RJ-45 connectors with Ethernet pinouts. The maximum cable
length is 328 feet (100 meters). The 100BASE-TX and 1000BASE-T traffic requires Category 5,
Category 5e, or Category 6 UTP cable. The 10BASE-T traffic can use Category 3 or Category 4 cable.
See
for recommended Ethernet cables.
The ports provide PoE support for devices compliant with IEEE 802.3af and also provide Cisco
prestandard PoE support for Cisco IP Phones and Cisco Aironet Access Points.
The switch delivers 15.4 W of PoE on any 24 of the 48 ports, or any combination of the ports delivers
an average of 7.7 W of PoE at the same time, up to a maximum switch power output of 370 W. On a
per-port basis, you can control whether or not a port automatically provides power when an IP phone or
an access point is connected.
To access an advanced PoE planning tool, use the Cisco Power Calculator available on Cisco.com at this
URL:
You can use this application to calculate the power supply requirements for a specific PoE configuration.
The results show output current, output power, and system heat dissipation.
Warning
Voltages that present a shock hazard may exist on Power over Ethernet (PoE) circuits if
interconnections are made using uninsulated exposed metal contacts, conductors, or terminals.
Avoid using such interconnection methods, unless the exposed metal parts are located within a
restricted access location and users and service people who are authorized within the restricted
access location are made aware of the hazard. A restricted access area can be accessed only through
the use of a special tool, lock and key or other means of security. Statement 1072
Caution
Category 5e and Category 6 cables can store high levels of static electricity. Always ground the cables
to a suitable and safe earth ground before connecting them to the switch or other devices.
Step 1
Connect one end of the cable (
) to the switch PoE port.
Step 2
Connect the other end of the cable to an RJ-45 connector on the other device. The port LED turns on
when both devices have established link.
The port LED is amber while Spanning Tree Protocol (STP) discovers the topology and searches for
loops. This process takes about 30 seconds, and then the port LED turns green. If the port LED does not
turn on, the device at the other end might not be turned on, or there might be a cable problem or a
problem with the adapter installed in the attached device. See Chapter 3, “Troubleshooting,” for
solutions to cabling problems.