Installation guide

Summit 300-48 Switch
Consolidated "e" Series Hardware Installation Guide 51
Redundant Power Supply
The Summit 300-24 supports Power over Ethernet (PoE) as defined by the IEEE 802.3af specification.
PoE is an effective method of supplying 48 VDC power to certain types of powered devices (PDs) by
way of Category 5 or Category 3 twisted pair Ethernet cables. Supported devices include the Altitude
300 wireless port, IP telephones, laptop computers, web cameras, or other devices. With PoE, a single
Ethernet cable supplies power and the data connection, thereby saving time and expense associated
with separate power cabling and supply.
Summit 300-24 switch software is responsible for managing overall power consumption to ensure that it
does not attempt to delivery more power than is available. The Summit 300-24 has sufficient power
budget to provide full 15.4 watts power on all 24 ports simultaneously. An external 465 W AC power
supply is available to provide redundant power.
To determine the wattage of the installed PSUs when the PSUs are in 1-to-1 redundant mode, use the
show inline-power command. When in PoE mode, most of the power is dissipated externally to the
switch by way of the inside attached PDs.
For further details on the external power supply and its 1 meter cabling, see “External Power Supply
(45019)” on page 75.
Summit 300-48 Switch
The Summit 300-48 supports wireless and Power over Ethernet (PoE) networks. The 2U high switch
provides 48 autosensing10BASE-T/100BASE-TX ports using RJ-45 connectors. The Summit 300-48 also
provides two 10/100/1000BASE-T Gigabit Ethernet uplink ports using RJ-45 connectors and four optical
ports. These optical ports allow Gigabit Ethernet uplink connections through Extreme 1000BASE-SX,
1000BASE-LX, or 1000BASE-ZX Small Form Factor pluggable (SFP) Gigabit Interface Connectors
(GBICs)—also known as mini-GBICs—using LC optical fiber connectors. The optical ports are also
combination uplink ports. For further information, see “Summit 300 Automatic Failover” on page 53.
Summit 300-48 Front View
The 48-port version is the Summit 300-48, which is shown in Figure 12.
Figure 12: Summit 300-48 switch front view
LB48001
10/100 Mbps ports with PoE
Expansion module slot
Console port
Mini-GBIC ports
10/100/1000 Mbps ports