FTOS Configuration Guide for the C-Series - Force10 Networks

Chapter 33 Power over Ethernet
This chapter contains the following major sections:
• Configuring Power over Ethernet on page 642
• Powering Additional PoE Ports on the S-Series on page 648
• Deploying VOIP on page 648
Power over Ethernet (PoE) is supported only on platforms: c s
Power over Ethernet (PoE) is supported on the C-Series and the S25V and S25V models of the S-Series.
PoE is a function—described by IEEE 802.3af—that enables power to be transmitted to Ethernet devices
over the signal pairs of an Unshielded Twisted Pair (UTP) cable. A maximum of 15.4 Watts can be
transmitted over a link. PoE is useful in networks with IP phones and wireless access points because
separate power supplies for powered devices (PD) are not needed.
The C-Series and S-Series transmit power to connected IEEE 802.3af-compliant devices via ports that are
enabled with PoE. Those platforms also support the protocols LLDP and LLDP-MED, which help the
system optimize connections to PoE devices. See Chapter 14, Link Layer Discovery Protocol, on page 283.
FTOS requires that a minimum number of AC power supplies (PSU) are installed in the C-Series before
PoE can be enabled, and some PSUs are reserved for PoE redundancy, as described in Table 59.
Note: The C-Series can provide PoE only through its AC power supplies.
Table 59 PoE Ports per Power Supply Unit in the C-Series
Number of Power
Supply Units
Max PoE Ports on
C300
Max PoE Ports on
C150
1 — —
2 — —
3 — 96
4 77 192
5 192 PoE Redundancy
6 288 PoE Redundancy
7 384 N/A
8 PoE redundancy N/A
FTOS Configuration Guide, version 7.7.1.0 641