3Com 3CNJPSE24 Datenblatt - Seite 3

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3 C O M

P O W E R O V E R E T H E R N E T M U LT I P O R T M I D S PA N S O L U T I O N D ATA S H E E T

Specifications

Feature

Compatibility, Reliability

IEEE P802.3af compliant

Smart Ethernet wiring

Shielded power

Power Management

Advanced autosensing algorithm

Power management

LED displays

Device Ports, Connectors

Power over Ethernet Output

24 MDI-X device ports

Pin assignments and polarity:

power transmitted over unused

Device connectors: shielded

wiring-pair pins 4/5 (RTN) and

RJ-45, EIA 568A/568B

7/8 (-V)

Management connectors:

Voltage: -48 VDC

DB-9 female port

Device ports: 15.4 W minimum

per port

Cables and Operating Distances

Category 5 or 5e, UTP or STP

Cumulative: 200 W total output

Ethernet cabling up to 100 m

Power feeding: P802.3af-compli-

(328 ft)

ant devices can be connected

directly to existing standard

Data Output

Category 5/5e-cabled LANs; for

Pin assignments: data transmit-

nonstandard or unpowered

ted over wiring-pair pins 1/2

devices, an external splitter can

and 3/6

be installed to separate power

and data transmissions into two

Rates: autonegotiating

separate outputs terminating at

10BASE-T or 100BASE-TX

the end device; phone products

can receive power by installing

Device Detection

a power module between the

P802.3af-compliant resistive

phone and power source

power discovery algorithm with

25 KΩ resistor in the powered

LED Indicators

device

AC power: green/orange

Incoming Power Requirements

DC power: green/orange

AC voltage: 88-264 VAC

User/channel power:

AC frequency: 47-63 Hz

green/orange

AC current: 3.5 A @ 110 VAC,

Dimensions

1.8 A @ 240 VAC

Height: 4.4 cm (1.75 in); 1 RU

DC current: 10 A @ 48 V

Width: 43.3 cm (17.0 in);

Volt amperes rating: 0.48 KVA

19-inch rack

(-48 V) 0.30 KVA (110 VAC)

Depth: 30.2 cm (11.9 in)

Benefit

Complies with the P802.3af draft specifica-

tion standard for interoperability with a wide

range of network devices.

Provides data and power over the same

network wiring; power is transmitted over

unused wiring pairs, keeping it separate

from data wiring pairs.

Reduces signal interference (crosstalk)

and insertion losses via shielded connectors,

intelligent wiring layout, and optimized

line termination.

Detects and tests devices using resistive

power discovery scheme; backwards

compatible with draft standard and

prestandard detection algorithms.

Controls power output to stay within power

budgets.

Provides real-time network monitoring

through bicolor LEDs on the front panel.

Weight

4 kg (8.8 lbs)

Environmental

Temperature: 0° to 40° C (32° to

104° F) operating; -20° to 75° C

(-4° to 167° F) storage

Humidity (noncondensing): Up to

90 percent operating; up to 95

percent storage

Altitude: -304.8 to 3,048 m

(-1,000 to 10,000 ft) operating

Thermal rating: 285 BTU

Networking Standards

Compliance

802.3 (unpowered state), 802.3u,

P802.3af (draft)

Regulatory Compliance

CE marking, C-tick

Electromagnetic Compliance

FCC Part 15 Class B, ICES-003

Class B, EN55022 Class B (emis-

sion), EN55024 (immunity),

VCCI (Japan), MIC (Korea)

Safety Approvals

UL/cUL 60950; EN 60950;

GS mark, IEC 60950,

NOM-001-SCFI-1993 (Mexico)