Cisco Cisco 3900 series Manual de usuario descargar pdf (Pagina 5)

Data Sheet

Cisco EnergyWise technology extends the network as a platform for the power control plane for gathering,

managing, and reducing power consumption of all devices, resulting in companywide optimized power delivery and

reduced energy costs.

Advanced PoE Support

Although Power over Ethernet (PoE) has been employed for more than a decade, it is still an evolving technology.

New and innovative applications continue to raise expectations for power requirements. The Cisco Enhanced

EtherSwitch Service Modules are the first EtherSwitch modules to take advantage of the increased power

capabilities of the Cisco 2900 and 3900 Series routers. Table 3 gives information about total PoE power output.

Depending on the Cisco 2900 and 3900 Series router model, the available PoE power ranges from 200 to 1014

watts. The Cisco Enhanced EtherSwitch Service Module supports not only IEEE 802.1af (15.4 watts), but also Cisco

ePoE (20 watts, ES3 only) as well as Cisco pre-standard PoE. The support of both new and old power levels

demonstrates Cisco’s commitment to protection of your initial investment while planning for the future. Additional

PoE features include:

Per-port power consumption control allows you to specify a maximum power setting on an individual port.

Per-port PoE power sensing measures the actual power being drawn, enabling more intelligent control of

powered devices.

The Cisco PoE MIBs provide proactive visibility into power usage and allow you to set different power-level

thresholds.

Cisco Discovery Protocol Version 2 allows the Cisco Enhanced EtherSwitch Service Modules to negotiate a

more granular power setting than IEEE classification provides when connecting to a Cisco powered device

such as IP phones or access points.

The Link Layer Discovery Protocol Media Endpoint Discovery (LLDP-MED) link layer discovery protocol and

MIB enable interoperability in multivendor networks. Switches exchange speed, duplex, and power settings

with end devices such as IP phones.

Power over Ethernet requires the PoE versions of the router power supplies. The Cisco 2900 and 3900 Series

routers support multiple PoE powering modes:

Normal: One PoE power supply

Redundant: Two PoE internal power supplies (Cisco 3925 and 3945) or one PoE power supply plus an

external Cisco RPS 2300 Redundant Power Supply Unit (Cisco 2911, 2921, and 2951), where one is active

and one is standby

Boost: Two PoE internal power supplies (Cisco 3925 and 3945) or one PoE power supply plus an external

Cisco RPS2300 (Cisco 2900), where both are actively supplying PoE power

Table 3. Power Output

Router Normal PoE with

Single POE

Power Supply

(Watts)

Maximum Number

of Ports Running

at 15.4W in

Normal Mode

Maximum Number

of Ports Running

at 20W in Normal

Mode

Maximum Power

with Dual POE

Supplies in Boost

Mode (Watts)

Maximum Number

of Ports Running

at 15.4W in Boost

Mode

Maximum Number

of Ports Running

at 20W in Boost

Mode

Cisco 3945 520 33 16 1040 65 50

Cisco 3925 520 33 16 1040 65 50

Cisco 2951 370 24 18 750 48 37

Cisco 2921 280 18 16 750 48 37

Cisco 2911 200 12 10 750 48 37

1 2 3 4 5 6 7 8 9 10 11

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